﻿124 



NORTH AMERICAN FA.UNA. 



tip of calcar small but distinct. Keel well developed and supported by 

 one or two cartilaginous outgi owtbs. 



Fur and color. — Tbere is notbing j)eculiar in tbe distribution of tbe 

 fur. It extends in a very narrow line on tbe wings along tbe side of 

 tbe bod}^ botb dorsally and veutrally, and on tbe uropatagium covers 

 tbe basal fourtb dorsally but scarcely reacbes tbe membrane on tbe 

 ventral side. 



In color tbe fur is dull yellowisb brown tbrougbout, scarcely paler 

 ventrally, tbe bairs dusky at tip. Ears and membranes dark brown. 



Sl^ull. — In general appearance tbe skull of Ehogeessa tumida (fig. 39) 

 stands between tbat of Xycticeius liumeraUs and Pipistrelhis suhflaviis. 

 Tbe skull of an adult female from Santo Domingo, Oaxaca {i^o. 731^67, 

 United States National Museum, Biological Survey collection), meas- 

 ures: Greatest lengtb, 13-, zygomatic breadtb, S.I; breadtb of rostrum 

 at anterior edge of first molar, 5; mandible, 9;^ upper tootb row, 5.6; 

 lower tootb row, 6. Tbat of an adult female from Patuca, Honduras 

 Qso. 21017, United States National Museum), meas- 

 ures : Greatest lengtb, 12.4 ; zj-gomatic breadtb, 8 ; 

 breadtb of rostrum at anterior edge of first molar, 

 4; mandible, 9.4; upper tootb row, 5; lower tootb 

 row, 6. Tbe rostrum is relatively narrower tban 

 in NycUceiUs and tbe occiput is more elevated. 

 Tbe muzzle is distinctly concave in front of orbits 

 instead of flat or almost convex as in Xycticeius. 

 Teeth. — Upper incisor usually in contact witb 

 i<iQ. i^.-fiKmi 01 n'tiogeessa cauiue, tbougb occasioually separated by a narrow 

 tumida{x2). spacc (fig. 40rt). Maxillary tcctb essentiallj^ as in 



Nycticeius, but premolar relatively larger and posterior molar narrower 

 in proportion to its lengtb. 



Lower incisors greatly crowded, tbe outer cusp of i 1 and i 2 mucb 

 smaller tban middle and inner cusp. Outer lower incisor uni uspi- 

 date, about one-bali^ tbe size of il orT2. Otber mandibular teetb 

 essentially as in Xycticeius^ but premolars more crowded. 

 Measurements. — See table, page 129. 



Specimens examined. — Total number, 10, from tbe following localities: 



Colima: Colima, 3. 



Costa Rica: , 1. 



Guatemala: Huehnetan, 1. 

 Guerrero: Amula, 1 (Merriam coll.), 

 Honduras: Patuca, 2. 

 Oaxaca: Santo Domingo, 1. 

 Vera Cruz: Mirador, 1. 



General remarks. — Rhogee'ssa tumida needs comparison witb B. par- 

 rula and B. minutilla only. From tbe former it is distinguisbed by its 

 clear yellowisb fur witbout darker base, and from tbe latter by its con- 

 siderably larger size. 



1 As the mandible is imperfect, this measurement is only approximately correct. 



