ALLEN : NOTES ON CHIROPTEKA. 45 



Colombia, and from Panama. Those from northern South America seem identical 

 in all respects with the Brazilian individuals. The second premolar of both jaws 

 usually tends to be drawn in slightly from the tooth row. In one specimen, 

 No. 42S6, from Lagoa Santa, Brazil, the second lower premolar of the left side is 

 lacking, and the corresponding upper premolar is somewhat reduced in size. In 

 No. 8061, from Santa Marta, Colombia, the minute second premolar is lackiug 

 from the right maxillary row, and the first premolar stands nearly in the centre of 

 the space between the third premolar and the canine. The tendency to lose this 

 almost non-functional tooth is of interest as showing the probable future course of 

 evolution, and a similar tendency is well known in various species of bats in case 

 of these and other teeth. 



My otis subulatus (Sat). 



A skin with skull from Chihuahua, Mexico, was collected August 10, 1905, by 

 the John E. Thayer Expedition, and seems typical in every way. The collection 

 also contains specimens from Grand Menan, N. B., and Lake Edward, Quebec, 

 to Arkansas. The possibility of hybridization occurring between this species and 

 M- lucifugus has been mentioned under the latter. 



Pipistrellus abramus (Temminck). 



This species is common and generally distributed in southeastern Asia. Mr. 

 Thomas Barbour collected a large series at Buitenzorg, Java, and also obtained 

 four in alcohol from Oshima, Loo Choo Islands, and oue from Yokohama, Japan. 

 This bat has not previously been recorded from the Loo Choos. The Javan series 

 shows more or less individual variation. The forearm measurement of twenty- 

 five specimens averages about 34.7 mm. (32.6-36.5). The outer upper incisor 

 usually just exceeds the cusp of the inner incisor in vertical extent, but is worn 

 down more rapidly than the latter, so that in old skulls it is distinctly shorter 

 than the cusp. In one case, however, the outer, upper incisor is distinctly shorter 

 than the cusp of the inner, although the teeth are apparently unworn. An adult 

 female from Buitenzorg contained two large fetuses. 



Pterygistes lasiopterus (Schreber). 



Three adults in alcohol were obtained from Hondo, Japan, by Mr. Thomas 

 Barbour, and by him presented to the Museum. Japanese and Chinese specimens 

 are both currently referred to lasiopterus, but I have had no opportunity to com- 

 pare the insular with continental examples. The dimensions of these specimens 

 are here given. 



