VI. New Malayan Rhynchota. By W. L. DISTANT,

[Read April 7th, 1909.]

PLATE X.

THE following descriptions refer to Malayan Rhynchota recently acquired by the British Museum. Since Snellen. van Vollenhoven published his "Essai d'une Faune Entomologique de L'Archipel Indo-Néerlandais," we know much more of the beautiful Rhynchota of this prolific region, and here we must acknowledge the excellent work of Stål, as well as the descriptive industry of Walker, while other more recent writers have added to our knowledge. We still, however, know only a fragment of the Malayan Rhynchotal fauna in comparison with our much fuller enumeration of the Lepidoptera-especially the Rhopalocera, of the same region.

HETEROPTERA.

Family PENTATOMIDAE.

Genus POECILOCORIS.

Poecilocoris, Dall., Trans. Ent. Soc., v, p. 100 (1848).
Type, P. druraei, Linn.

Poecilocoris croesus, sp. n.

(Plate X, fig. 1.)

Head purplish-brown, the lateral lobes sanguineous; antennae with joints 1, 2, 3 bluish-black; 4, 5 black; pronotum sanguineous, with two very large discal purplish spots which are centrally only divided by a narrow line, on each spot anteriorly is a transverse narrow green fascia; scutellum for rather more than half its length purplish, posteriorly containing a prominent transverse metallicgreen fascia, a more obscure basal transverse fascia of the same colour but centrally obsolete, apical area sanguineous, containing two central purplish spots; body beneath with the sternum purplishred suffused with metallic-green, the area of the odoriferous apertures opaque black, abdomen purplish-red, with prominent black spots near the stigmata; legs with a bluish or greenish lustre; rostrum black.

TRANS. ENT. SOC. LOND. 1909.-PART III. (SEPT.)

Var. Head almost entirely purplish-brown; ground colour of pronotum more reddish-ochraceous than sanguineous; scutellum altogether purplish, not sanguineous behind the transverse metallicgreen fascia, but containing an oblique sanguineous spot on each lateral margin.

Antennae with the first joint not nearly reaching apex of head, a little longer than the second which is shortest, third shorter than fourth; head sparingly punctate, the punctures mostly in longitudinal patches; pronotum with the two large dark spots thickly, coarsely punctate, remaining area more sparingly and finely punetate, about two transverse series of punctures before anterior margin; scutellum thickly punctate; rostrum reaching the posterior

coxae.

Long. 16 to 17 mm. Exp. pronot. angl. 10 to 10 mm.

Hab. NIAS ISLANDS: Hili Madjedja (Mitschke, Brit. Mus.).

Allied to P. dives, Guér.

Genus ALCIMOCORIS.

Alcimus, Dall., List. Hem. I., p. 218 (1851), nom. pracore. Alcimocoris, Bergr., Rev. d'Ent. x., p. 214 (1891), nom. nov. Type, A. lineolatus, Dall.

Alcimocoris marapokensis, sp. n. (Plate X, fig. 3, a.)

Head black, a small central spot near base and a sublateral longitudinal fascia posteriorly obliquely directed to eyes, reddishochraceous, the surface sparingly and irregularly granulose and punctate; pronotum with the anterior area black, opaque, laterally, posteriorly reddish-ochraceous, and with a broad transverse subanterior space enclosed by reddish-ochraceous lines which are connected with eyes and posteriorly and centrally are produced in two unconnected short longitudinal lines, all these pale margins and lines are bordered by linear series of punctures, basal two-thirds of pronotum black, very coarsely punctate, and with reticulate reddishochraceous markings, the lateral margins very strongly and longly produced transversely and a little upwardly, with two longitudinal grooves above, and notched above before apices which are acute; scutellum black, somewhat finely punctate, with six longitudinal and more or less broken reddish-ochraceous lines; corium black, coarsely punctate, base of costal margin, a subcostal marginal line, claval margins, and a somewhat broken central curved line, ochraceous or reddish-ochraceous; body beneath black, coarsely punctate, the lateral and incisural margins, other transverse raised lines and

particularly a central one to under surface of produced lateral angles, reddish-ochraceous; legs black, apices of femora ochraceous; rostrum black, reaching the intermediate coxae; antennae brownish, second and third joints almost subequal in length.

Long. 8 mm. Exp. pronot. angl. 14 mm.

Hab. BRIT. N. BORNEO: Dent Province, Mt. Marapok (Brit. Mus.).

Allied to A. lineolatus, Dall., but with the frontal angles longer and less recurved.

Genus RHYNCHOCORIS.

Rhynchocoris, part. Westw. in Hope Cat. I, p. 29 (1837). Type, R. humeralis, Thunb.

Rhynchocoris bicolor, sp. n. (Plate X, fig. 2.)

Black; broad anterior margin to pronotum-posteriorly straight and almost on a level with the anterior margins of the lateral angles,-base and apex of scutellum, body beneath and legs bright ochraceous; antennae black, first joint streaked beneath with pale ochraceous, fourth joint longer than either second or third which are subequal in length (fifth mutilated in specimens now before me); head transversely wrinkled and punctate, apical inner margins, of the lateral lobes and a central longitudinal spot at base, pale ochraceous; pronotum, excluding the pale anterior margin, thickly coarsely punctate, the anterior marginal area smooth with a submarginal series of punctures laterally and anteriorly, the lateral angles outwardly straightly acutely produced, their extreme apices slightly recurved backward; scutellum coarsely punctate, more slightly and less punctate on the ochraceous base and apex ; corium very thickly punctate; connexivum ochraceous spotted with black at the incisures; two lateral marginal lines on each side of head beneath; rostrum extending to the middle of the abdomen; mesosternal process large, compressed, extending a little beyond the anterior coxae, apices of tibiae and tarsal joints and the tarsal claws black; stigmata and the posterior marginal segmental angulations, black.

Long. 19 to 23 mm. Exp. pronot. angl. 13 to 16 mm.

Hab. CELEBES: Menado (Brit. Mus.).

Genus EMBOLOSTERNA.

Embolosterna, Stål., En. Hem. I., p. 66 (1870).
Type, E. taurus, Westw.

Embolosterna unicolorus, sp. n.

(Plate X, fig. 4, a.)

Above olivaceous-brown, more distinctly olivaceous on head, margins and lateral angles of pronotum, and lateral margins of corium; antennae black; membrane cupreous; body beneath pale castaneous, sternum and a patch on each side of basal area of abdomen thickly palely ochraceously pilose; second and fourth joints of antennae longest and subequal in length, third much longer than first; pronotum thickly finely punctate; anterior and lateral margins and produced lateral angles much more coarsely punctate, the latter transversely and very slightly forwardly produced, their apices truncate; scutellum sparingly coarsely punctate, the apical area foveately impressed; sternal process strongly anteriorly produced, compressed above and anteriorly rounded, and extending to the latitude of the apex of the head; femora strongly spined at apices.

Long. . 27 mm. Exp. pronot. angl. 20 mm.

Hab. BORNEO; Brunei (Brit. Mus.).

Genus AMISSUS.

Amissus, Stål., Trans. Ent. Soc. Lond. (3), 1. p. 595, 1863. Type, A. atlas, Stâl.

Amissus testaceus, sp. n. (Plate X, fig. 5.)

Testaceous-red; head with the lateral margins, apical margins (narrowly) and the basal marginal area, black; antennae ochraceous, apical half of the first joint black; tibiae and apices of femora black, tarsi ochraceous, tarsal claws black; membrane brownishochraceous; head as long as anterior tibiae, the lateral margins robustly reflexed, apical margin sinuately truncate; pronotum with the lateral angles anteriorly and less outwardly produced, their apices level with the apical latitude of the head, their anterior margins coarsely shortly serrate for about half their length from base, their apices subangularly rounded, their upper surface sparsely coarsely punctate, disk of pronotum sparingly punctate, more thickly punctate before the anterior margin and much less punctate on basal marginal area, a darker opaque transverse narrow fascia between the anterior bases of the pronotal angles and more narrowly continued along the inner margins of the produced angles, posterior margin convexly produced over base of scutellum; scutellum very sparingly punctate, its apex moderately longitudinally sulcately impressed; corium very thickly finely punctate; rostrum slightly passing the anterior coxae; mesosternum centrally broadly elevated

and widely emarginate anteriorly; mesosternum broadly centrally elevated and posteriorly broadly sinuate; femora spined at inner apical margins.

Long. . 44 mm. Exp. pronot. angl. 29 mm.

Hab. MALACCA (Brit. Mus.).

Allied to A. atlas, Stål., but apart from the different colour of body and legs it differs by the larger size, straighter and more angular apex of scutellum; fourth joint of antennae distinctly longer than second-about as long as second in A. atlas, mesosternal process anteriorly more widely emarginate, etc.

A second specimen is contained in my own collection from the Malay Peninsula, and in this the veins to the corium and the claval veins are distinctly paler in hue.

SANGANUS, gen. nov.

Broadly subovate, abdomen apically broadly truncate; head small, about as long as broad including eyes, lateral lobes much longer than central lobe, obliquely narrowing to apex; ocelli much nearer eyes than to each other; rostrum about reaching middle of mesosternum, basal joint very slightly passing base of head, apical joint small and incrassate; antennae four-jointed, fourth joint about as long as second; pronotum about twice as broad as long, the lateral angles forwardly and slightly outwardly produced, posterior margin subtruncate; scutellum much broader than long, the apex prominently narrowed and produced; abdomen broad, posteriorly broadly truncate, connexivum exposed for about one-third of base of lateral margin of hemelytra; prosternum centrally longitudinally sulcate; mesosternum with a central flat process which for half its length is centrally sulcate, metasternum with a central angulate process behind the intermediate coxae, not prominently raised; legs of moderate length, femora and tibiae almost equally long, the tibiae straight; femora apically spined.

Type, S. jenseni, Dist.

This genus is allied to Oxylobus, Stål., and apparently includes the Pycanum westwoodii, Voll., a species only known to me by its figure.

Sanganus jenseni, sp. n. (Plate X, fig. 6.)

. Body above ochraceous; connexivum, abdomen beneath and legs black; sternum piceous-brown; antennae with the first and fourth joints piceous; the second and third castaneous-brown,