﻿CORYNORHINUS. 



49 



second premolar, the buccal surface is abruptly convex. The first premolar is small, 

 not wedged in, with complete cingulum. The space between it and canine narrower 

 than that between it and second premolar. The second premolar as long as the 

 canine and slightly fluted. Molars as in Corynorhinns. 



Lower teeth. — Incisors crowded, trifid, i. e., the main cusp jjossesses a well-devel- 

 oped cusi^ule on each side of the base, the cingulum on the posterior side being- 

 large. The first and second teeth overlap for a distance equaling one-half of their 

 diameters. The third incisor retains a posterior cuspule which is larger than the 

 anterior and separated from the main cusp by a wide interval. The canine is small 

 and projects but a slight degree above the incisors. It exhibits a marked cuspule 

 on the cingulum anteriorly. 



Measurements (from skin). — Total leDgtli, 110; tail vertebrae, 50; 

 tibia, 131; foot, 9; forearm, 50; thumb, 6.8; longest finger, 91; ear from 

 meatus, 34; width of ear, 22; tragus, 13; greatest width of tragus, 5. 



Specimens examined. — One, the type (Am. Mus. Nat. Hist., K'ew York). 



General remarlvs. —Euderma maculatum differs so widely from all 

 other known bats that no comparison with any is necessary. Its pecul- 

 iar color at first suggests albinism, but since the fur is everywhere dark 

 at base, even in the white areas, the i^attern is probably normal. It is 

 useless to hazard any conjecture as to its probable geographic range 

 or exact faunal i^osition. 



The following note on this bat is kindly furnished by Dr. 0. Hart 

 Merriam : 



The type of this remarkable genus and species, recently described by Dr. J. A. 

 Allen, is believed to have been ol)tained at the mouth of Castac Creek in the Santa 

 Clara Valley, near San Fernando, Cal. The type sjiecimeu remains the only one thus 

 far collected, but the si)ecies probably ranges over much of the Lower Souoran 

 Desert region in summer. While in Vegas Valley, Nov., I was told by the Stuarts, 

 the owners of Vegas Ranch, that a very large bat Avith ears like a jackass and a 

 white stripe ou each shoulder " is abundant at that place in the summer, but does not 

 occur in spring or fall. They stated that it had not yet arrived at the date of our 

 visit, :May 1, 1891. 



Genus CORYNORHINUS H.Allen. 



1831. n<c()tus Le Conte, McMurtrie's Cuvier, Animal Kingdom. I, Appendix, p. 431 



(not rircotus Geoliroy 1818). 

 1861. Sifnotns H. Allen, Mouogr. N. Am. Bats, p. 62 (not Synotus Keyserling & Blasius 



1839). 



1865. Corynorhinua H. Allen, Proc. Acad. Nat. Sci., Phila., p. 173. 

 1878. Plecotus Dobson, Catal. Chiroptera Brit. Mus., p. 177 (part). 

 1893. Corynorhinns H, Allen, Monogr. Bats N. Am., p. 53. 



Type species. — Corynorhinns macrotis (Le Gonte). 

 Geographic distributio)i. — Austral zones throughoutthe United States, 

 and in Mexico south at least to Yera Cruz. Limits of range imper- 

 fectly known. 



Generic characters. — Dental formula : 



. 2-2 1-1 2-2 3-3 



^'3-3' ^'1=1' ^"'3--5 = ^'- 



Skull (fig. 8, p. 52) slender and highly arched, the rostrrd portion relatively 



I smaller and weaker than in any other North American genus of the 

 2772— No. 13 4 



