246 VESPEKTILIONID^. 



Hah. Mexico (Tres Marias, Mirador) ; Honduras ; Costa llica. 



Although this species has the dental formula of Nycticejus, it, in 

 all other respects, evidently belongs to the genus Vespertic/o. This 

 is especially shown by the notched upper incisors, the form of the 

 ears and tragus, and the distinct postcalcaneal lobe. 



I have no doubt that Wiogeessa parvula and li. tumida, Allen, are 

 the same species. The describer mentions no distinguishing cha- 

 racter of sufficient importance. B,. tumida was evidently described 

 from a more fully-grown specimen than those from which the ori- 

 ginal description of R. parvula was taken. 



This species must not be confounded with Vespertilio parvulus, 

 Temminck, which is a true Vespertilio, and, in my opinion, identical 

 with Vespertilio nigricans, Wied (see p. 319). 



a, h. $ ad., al. Honduras. ]VIr. Dyson [0.]. 



c, d. j ad., al. Costa Rica. Purchased. 



7. CHALINOLOBUS. 



Chaliuolobus, Peters, MB. Akad. Bm-l. 1866, p. 679, and 1867, p. 480 

 (note) ; Dobson, P. Z. 8. 1875, p. 382. 



Muzzle broad, generally very short and obtuse ; nostrils opening 

 sublaterally, forming a prominent flattened central ridge on the upper 

 surface of the muzzle, separated from the well-developed glandular 

 prominences by a distinct groove on either side. Ears short and 

 broad, rhomboidal or ovoid ; the outer margin prolonged forwards 

 towards the aJigle of the mouth ; tragus expanded above and curved 

 inwards. Lower lip u'illi a distinct fleshy lobide placed near the 

 angle of the mouth and projecting horizontally outwards. "Wings to 

 the base of the toes ; taU generally nearly as long as the head and 

 body. 



Dentition. Inc. ^, c. j^, pm. j^ or ^^, m. ^^. 



Upper incisors unequal ; the inner incisors on each side long and 

 unicuspidate ; outer incisors short, scarcely equalling in vertical ex- 

 tent the cingulum of the inner incisors ; in species having two upper 

 premolars the first is very small, placed in the inner angle between 

 the canine and closely approximated second premolar, and visible only 

 with the aid of a lens. 



This genus closely resembles Vesperugo in general characters, but 

 is readily distinguished by the lobe projecting from the lower lip on 

 cither side near the angle of the mouth, by the unicuspidate upper 

 inner incisors, by the remarkable obtuseness of the muzzle and 

 shortness of the head, by the prominent nostrils separated by distinct 

 grooves from the well-defined glandular elevations, by the much 

 longer and more slender tibiaB, and, in most species, by the pecu- 

 liarly thin membranes traversed by remarkably distinct reticidations 

 and parallel lines. 



The form of the ear-conch and tragus, the short broad muzzle, 

 the long tail generally wholly contained within the wing-membrane, 



