PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 81 



ovary. Vitellaria composed of small follicles situated laterally, 

 extending from base of acetabulum to about the level of anterior 

 margin of anterior testis. Uterus long and consisting of irregular 

 coils; the portion of the uterus containing immature eggs is limited 

 to the intercecal space, while the portion containing mature eggs 



may extend into the extracecal space; 

 uterus coils to right side of anterior 

 testis, and to left side of posterior testis, 

 and terminates in a well-defined metra- 

 term, which extends dorsally and to left 

 of cirrus pouch and opens into genital 

 aperture. Eggs oval, brown, 23/x, to 26/i, 

 long by 12;u, wide. 



Type host. — Lasiums horealis. This 

 species also occurs in the bat Nycticeius 

 hjuTneralls and in an undetermined species 

 of bat from Texas. 



Location. — Small intestine. 

 Locality. — United States; type local- 

 ity, District of Columbia. 



Type specime7is. — U.S.N.M. Helm. 

 Coll. No. 30117; paratypes No. 30118. 



Remarks. — TJrotrenia lasiv/rensls is the 

 only species of the genus known to occur 

 in bats in this country. Price (1931) 

 reported finding a species Identical with 

 or closely related to U. scdbridvmi from 

 bats in Texas. Specimens of the form 

 from the Texas bat and other specimens 

 collected by Price from a bat {Nycticeius 

 hvmheraUs) at Glen Dale, Md., have been 

 placed at the writer's disposal, and a care- 

 ful comparison has shown them to be 

 identical with the species described here 

 as U. lasiurensis. The description of U. 

 lasiurensis is based largely upon three 

 mature specimens collected from one bat. 

 This species apparently occupies a position intermediate between 

 U. scabridum Braun, 1900, and U. shiUingerl Price, 1931. In U. 

 scabridv/m the vitellaria extend from the base of the acetabulum to 

 about three-fourths of the distance between the ovary and the an- 



FiGURB 1. — TJrotrema l/isiurensis , 

 new species. Ventral view 



