in the niger has the middle of the back nearly black; while that of M chrysosurus appears to be a variety, merely differing in the tail being more rufous" (l. c. p. 669). There is nothing in Pucheran's description of the last-named species to indicate it is not the young of S. hoffmanni. Judging from what I have seen in other species, the darker color of the lower surface in Alston's S. rufoniger as compared with S. deppei might result from immaturity; but in deference to Mr. Alston's opinion, grounded on excellent opportunities for deciding, I give the species provisional recognition. XVI. SCIURUS PUSILLUS, Geoffroy. Sciurus pusillus, "IS. GEOFFROY", DESMAREST, Dict. d'Hist. Nat. x, 1817, 109; Mam. 1822, 337, pl. lxxvii, fig. 2.—ALSTON, Proc. Zoöl. Soc. Lond. 1878, 670 pl. xli. Macroxus kuhli, GRAY, Aun. and Mag. Nat. Hist. 3d ser. xx, 1867, 433. NOTE. These names-the first with a query, the second unhesitat ingly-I referred in my monograph to S. æstuans, influenced mainly by the strong aspect of immaturity presented by a specimen in the Museum of Comparative Zoölogy, which undoubtedly represents this species, notwithstanding the statement by Buffon, quoted by me, that the type of the species was shown by the sexual organs to be adult. Although Mr. Alston was unable to find the type of Geoffroy's S. pusillus, he seems to have established its distinctness from S. æstuans by finding two upper premolars in the British Museum specimens bearing that name. He considers Gray's M. kuhli (which I treated also as the young of S. estuans} as unquestionably identical with S. pusillus. This is apparently a very rare species, as I have met with references to not more than half a dozen specimens in all. It is by far the smallest American species of Sciurus. The subjoined summary indicates the changes in nomenclature here made from that adopted in "Monographs of North American Rodents", and also that employed by Mr. Alston in his recent paper "On the Squirrels of the Neotropical Region":— INDEX TO VOL. IV. Abies 824 Agrotis campestris 175 eriensis 172 evanidalis 172 fishii 175 idahoensis 171 janualis 169 juncta 171 micronyx 171 mimallonis 175 opacifrons 170 pluralis 174 rosaria 172 Aira 829 Alburnops 419 missuriensis 403 Aleucita 128 Algausea 419 Algonia 419 Alisma 825 Allen, J. A.: Description of a Fossil Passerine Bird Geographical Distribution of the Mam- Synonymatic List of American Sciuri Allgewahr, L.: List of Coleoptera collected by 471 Allosomus 430 Alnus 121 Alopecurus 828 Alpheus æqualis 199 bellimanus 199 bispinosus 199 clamator 197 cylindricus 196 Anas Anatidae 648 Andromeda 817 Andropogon 829 Androsace 818 Anemone 802 Anerastia hæmatica 704 Anguilla 414 Annaphila divinula 183 sulcatus 193 transverso-dactylus 196 Alpheus, Synopsis of North American Spe- Anesychia 129 cies of, by J. S. Kingsley 189 Anobium deceptum 763 lignitum 763 ovale 762 Anodonta parallela 709 Anorthosia 129 Anosia berenice 254 Anser hyperboreus 62, 649 hypsibatus 387 Antennarium 816 Anthaxia deleta 459 Antherophagus priscus 762 Anthus American Herodiones, Studies of, by R. Ridgway 219 Antiblemma canalis 185 Antilocapra americana 203 American Sciuri, Synonymatic List of the, Antispila 129 |