12 



BULLETIN 171, UNITED STATES NATIONAL MUSEUM 



Table 1. — Measurerticnts {in millimeters) of skulls and mandibles of Eptesicus 



grandis and E. fuscus 



Measurement 



Distance from anterior surface of canine to occipital condyle. 



Width of postorbital constriction 



Width of brain case -.- - 



Distance across occipital condyles 



Distance across zygomatic arches -. 



Length of upper dentition, P* to M'. 



Length of lower jaw from Ii to condyle.. 

 Length of lower dentition from C to Ms. 



Eptesicus 

 cf. grandis 



U.S.N.M. 

 no. 1S4S2 

 18.4 

 4.3 

 9.4 

 6.4 

 13.5 



U.S.N.M. 

 m. 1S/,3S 

 6.1 



U.S.K.M. 



no. 12U7 



15.2 

 8.3 



EpttsicuH 

 grandis 



A.M.N. 11. 



no. 11795 



(type) 



'6.1 



15.2 

 8.3 



Eptesicus 

 fuscus ' 



U.S.N.M. 

 no. 265580 

 (Dis. Mamm.) 

 18.3 

 4.6 

 8.5 

 5.S 

 12.9 



5.9 



15.0 

 8.2 



' Specimen of greater than average size. 

 ' Approximate. 



CORYNORHINUS ALLEGANIENSIS Gidley and Gazin « 



Figure 1 



Type. — Skull, U.S.N.M. no. 12412, with incomplete dentition and 

 lacking bullae and zygomatic arches. 



Specific characters. — Skull close in size to that of C. rafinesquii. 

 Frontal region not so highly inflated above dorsal plane of rostrum. 

 Median depression in the dorsal surface of muzzle not so deep. Depth 

 of posterior portion of skull from occipital condyles to top of inter- 

 parietal less. Occipital condyles slightly farther forward. Temporal 

 ridges do not unite posteriorly in a median ridge. 



Material. — Kepresenting Corynorhinus alleganiensis are 5 skull 

 portions and 29 lower jaw fragments. The most complete specimen 

 is the type, which is well preserved and clearly shows the proportions 

 of the rostrum and cranium (fig. la and b). However, the dentition 

 is not entire and the specimen lacks the zygomatic arches and tym- 

 panic bullae. U.S.N.M. no 12413 is an incomplete rostral portion 

 including all the cheek teeth posterior to the canine in the right 

 maxillary (fig. Ic) and three cheek teeth in the left. A fragmentary 

 third skull, U.S.N.M. no 12415, consists of the left portion of the 

 rostrum with the teeth, P* to M^ and a part of the frontal region. 

 The two remaining skull portions consist only of maxillary fragments 

 and teeth. The majority of mandibles are remarkably well pre- 

 served and include a greater part of the dentition (see fig. Id), although 

 only tw^o specimens retain the incisors. 



Description. — The skull of Corynorhinus alleganiensis is about the 

 size of that in the living species C. macrotis and C. rafinesquii. How- 

 ever, several characters are observed that clearly separate it from the 



» Gidley and Gazin, 1933, pp. 345-347, fig. 1. 



