ALLEN: mammalia: vespertilionid^. 191 



length, and the color of the pelage, which does not agree in any respect 

 with that of L. boyealis, nor very well with that of L. ciiieveus, but does 

 agree in length and softness with the Dasyptcrus ega group.^ (5) Villo- 

 sissimus also differs from the species of Lasiurus in habits. Rengger 

 says it lives in societies, often of many thousand individuals, in the lofts 

 of churches, in hollow trees, and in clefts in rocks. The species of Lasi- 

 urus do not assemble in large companies, and inhabit woods, clinging 

 head downward from the leaves and smaller branches of trees, and do not 

 resort to cavities in trees or rocks, or to lofts of buildings. 



Mr. Thomas has recorded both Lasiurus borealis bonarieusis and Dasyp- 

 tcrus ega argentinus from Central Paraguay ; but there appears to be no 

 record for the L. cinereus group from this region. Hence, apparently, the 

 first specimens of Azara's Chauve-souris septi^me seen by any recent 

 naturalist are those from Central Paraguay referred by Mr. Thomas to his 

 Dasypterus ega argentinus (Ann. and Mag. Nat. Hist. (7), VHI, Sept., 

 1901, p. 247 ; ibid., Nov., 1901, p. 435).^ 



' " Le poil est extremement dou.x, plus long que d'ordinaire, et d'une brun tres-blanchatre," 

 Azara ; " Der Pelz dieser Fledermaus is langhairig und weich anzufuhlen," Rengger. Hence the 

 appropriateness of the name villosissimus. 



'Dasvpterus villosissimus. 

 The synonymy of Azara's " Chauve-souris septieme, ou Chauve-souris brun-blanchatre," if the 



above hypothesis prove well-founded, will be as follows : 



Chauve-souris scpticmc, ou Chauve-souris In-un-blanchdtre, Azara, Quad, du Paraguay, II, 1804, 284. 



Vespertilio villosissimus E. Gcoffroy, Ann. du Mus., VIII, 1807, 204. Based on Azara, as above. 

 — Rengger, Naturg. Saeug. Parag., 1S30, 83. 



Atalapha villosissimus Burmeister, Desc. phys. Rep. Argent., Ill, 1879, 95. 



Lasiurus villosissimus, Allen, Proc. Biol. Soc. Wash., XIV, Dec., 1901, 184, critical. 



Lasiurus cinereus {villosissimus] Thomas, Ann. & Mag. Nat. Hist. (7), VIII, Nov., 1 901, 435 ; 

 inferentially ; considered as " clearly a southern representative of the Grey Bat {Lasiurus cin- 

 ereus P. de Beauv.)" ; ibid. (7), IX, Apr., 1902, 238, footnote, reaffirming this opinion. 



Dasypterus villosissimus Allen, as above. 



Dasyptcrus ega argentinus Thomas, Ann. & Mag. Nat. Hist. (7), VIII, 1901, 247, 435. 



Postscript. 

 Since passing the first fifty pages of this Report for the press I have found that the name 

 Ctenomys robustus as used by me {antca, pp. 38 et scq.) is preoccupied hy a Ctcnomys robustus 

 Philippi (An. del Musco.nac. de Chile, Zool., entr. 13, 1896, p. 11, pi. iv, fig. 2, animal, pi. v, 

 fig. I, skull; Province of Tarapaca, Chile, alt. 1200 m.). Although I have a reference in my 

 bibliographical notes, made in 1901, to Philippi's species, I had quite overlooked the prior use of 

 the name till recently reminded of the lapsus by my friend Mr. W'ilfred H. Osgood, of the 

 U. S. Biological Survey. My Ctenomys robustus {nee Philippi) may therefore be appropriately 

 renamed Ctenomys osgoodi. 



