1902.] NATURAL SCIKNCES OF PIIILADELl'IIl A. 391 



the (lark basal area, thus ilislanlly .suggesling a tricolor pattern. 

 Ears and membranes brown, the free edge of the wing apparently 

 lighter, but this is perhaps due to some irregularity in drying. 



Skull. — The skull is much larger than that of Plpidrellus siib- 

 flavus, in this respect slightly exceeding tliat of Myotis lucijufjus. 

 In form it is longer and narrower than in the other American 

 species of Pipistrcllus, a difference which is particularly noticeable 

 in the rostrum and palate. Thus, while the length of the bony 

 palate is 1.4 mm, greater than in a fully adult P. subjiavm, the 

 width between middle molars is no more and the distance between 

 roots of upper incisors is probably a little less than in the smaller 

 species. Lachiymal foramen large, its centre over posterior root of 

 large premolar; distance from its lower edge to rim of alveolus less 

 than width of large premolar measured along cingulum. In 

 P. subflaviis this distance is distinctly greater than width of tooth. 

 Bony palate more produced behind line of last molar than in the 

 allied species, the median projection large and well developed. 

 Audital bullse of same relative size as in P. subflavus. 



Teeth. — Aside from their much greater size, the teeth do not differ 

 notably from those of Pipistrcllus subflaviis. Inner upper incisor 

 distinctly smaller than outer, not approximately equal to it as is 

 the case in P. subflaviis. First upper premolar as large as outer 

 incisor, slightly internal to toothrow, but plainly visible from outer 

 side. First and second upper molars with a distinctly indicated 

 hypocone, no trace of which is present in P. subflaviis. Lo\\er 

 incisors crowded into a continuous row between the canines, the 

 crown of the outermost subterete. Other mandibular teeth essen- 

 tially as in P. subflavus, except for their greater size. 



Measurements. — External measurements of type: Total length, 

 99; tail, 44; tibia, 15.4; foot, 9.6 (8); forearm, 37; thund), 

 6.8; second finger, 35; third finger, 63; fourth finger, 53; fifth 

 finger, 47; ear from meatus, 11.4; ear from crown, 9; widlli of 

 ear, 7. 



Cranial measurements of type: Greatest length, 15 (13);- basal 

 length, 14 (12); basilar length, 11.6 (9.8); palatal length 

 (median, but posterior spine not included), 6 (4.8); width of 

 palate between middle molars, 3 (3) ; intei'orbital constriction, 



'^Measurements in ))arenthescs are Wxosq oi a,n».(\.\\\t Pipistnllus aub- 

 flavuH horn Raleigh, N, C. (Xo 30,655). 



