110 Miller The Central American Thyroptera. 



Thyroptera tricolor Dobson, Catalogue of the Chiroptera in the British 

 Museum, p. 345, 1878 (in synonymy only ; the description refers 

 strictly to South American specimens). 



Type locality. Puerto Caballos, Honduras. 



Geographic distribution. Central America from Puerto Caballos, Hon 

 duras, south to Bluefields, Nicaragua. 



General characters. Size small ; length about 45 mm.; tail, 26 ; forearm, 



31. Calcar slender, distinct, slightly 

 longer than free border of interfemoral 

 membrane, terminating in an ill-defined 

 lobllle ; the posterior edge with a well- 

 formed keel supported by one strong 

 cartilaginous process. Terminal 2 mm. of 

 tail free. Free border of uropatagium 

 with a few scattered hairs. Ears short, 

 funnel-shaped, acutely pointed, when laid 

 forward reaching barely to tip of nose. 

 Wings from middle of claws. Third and 



FIG >.i.-Teeth of Thyroptera dis- fourth toeg d ]y approximated and 

 a/era ; a, upper ; 6, lower (X 5)- 



firmly bound together. 



99 11 ^ *? 



Teeth. Dental formula as usual in the genus: i- t c- -, pm 5,, 



b 11 o 3 



q_q 



m ' = 38. The teeth (Fig. 1) are small and weak for the size of the 



oo 



skull. Upper incisors bifid,* in pairs, the outer tooth half as large as the 

 inner and separated from the canine by a space about as wide as the crown 

 of the larger incisor. Premolars all in the tooth row, not separated by 

 spaces from each other or from the adjoining molar and canine, first 

 slightly smaller than second, third slightly more than half as large as 

 first molar. Crown of first molar broadest, 

 crown of second longest. Lower incisors trifid, 

 the crown of the outer as broad as that of the 

 first and half of the second. First lower pre- 

 inolar smaller than second, but larger than 

 canine. Middle lower molar largest. 



Ears. The ears are short, acutely pointed, 

 funnel-shaped, and directed forward. The tips 



, , , . ,. , f , FIG. 2. Head of Thyroptera 



do not reach tip of nose when the ears are laid disdfera (x 3) 



forward. The anterior border is strongly con 

 vex from base to small concavity just below very narrowly rounded off 

 tip. Posterior border concave immediately below tip, then convex to 

 basal notch. The basal notch is strongly developed and isolates a very 

 large lobe which joins side of head below line of lips (Fig. 2). 



Tragus short and broad, the tip thickened and bent abruptly forward ; 

 a large thickened basal lobe directed forward and outward, and a minute 

 process directed backward just above posterior base. 



* Dobson states that in Thyroptera tricolor the outer incisor is unicuspi- 

 date. 



