080 



REPORT OK STATK 0 KO i I S'l' 



rouiid(Hl. Tragus short and l)road with the posterior border strong- 

 ly convex at tlie l)ase; tip blunt; anterior border straight, ])ut con- 

 siderably bent forward. 



The membranes are thin and delicate, with a few short hairs 

 scattered over their surfaces. The wing membriane is attached at 

 the base of the toes; the interfemoral at the tarsus. Calcar very 

 slender and short ; thumb proportionally large. 



Measii7^ements. — Average of ten from Mitchell : Total length, 

 78.4 mm. (3 2/16 in.) ; tail, 35.3 mm. (1 7/16 in.) ; hind foot, 8.8 

 mm. ('5/16 in.) ; forearm, 33.3 mm. (5/16 in.) ; ear, 9.5 mm. 



Skull and teeth. — The skull (fig. 30) is small and light, with a 

 narrow muzzle and very convex braincase ; teeth small ; the average 



a b 

 Fig. 30. — Skull of PipistreUtis subfiacHS : a, lateral view ; b, dorsal view. After 

 Miller, N. Am. Faimt No. i:^, Bureau of the Biol. 8ur., U. S. Dept. of Agri. 



cranial measurements of ten specimens from Mitchell are: Great- 

 est length, 13.4 mm. (V' in.) ; length of palate, 5.5 mm. (3/16 in.) ; 

 maxillary tooth row, 5.6 mm. (3/16 in.) ; greatest width of brain- 

 case, 7.2 mm. (5/16 in.) ; depth of braincase over bulla, 6.4 mm. 

 (1/4 in.). 



Bange. — Eastern United States, from southern New' York to 

 Iowa and south to Texas and Alabama. In Indiana it is apt to 

 occur all over the State, but the only records are from the southern 

 half. Next to Myotis lucifugns, it is the most abundant bat in the 

 caves of Monroe and Lawrence counties. It has also been recorded 

 from Franklin ('ounty. A specimen taken at Mitchell on Novem- 

 ber 16, 1906, resem])h's the northeastern form, Pipistrellus suhfla- 

 vus obscuriis JMiller, in its darker and duller coloration. 



Habits. — The habits of this species resembles those of the other 

 cave bats. They leave the cave later in the spring and the major- 

 ity return later in tlie fall than do the species of Myotis. 



Mating takes phice alxmt the end of November and the young 

 ar(! ])robably born in .July. The single pregnant f(^male which I 

 have examined conlaincd 1hree veiy small enibr-yos on the 6th of 

 June. 



