334 THE CANADIAN ENTOMOLOGIST. 



at their apices, and extended obliquely forward, reaching the wing-margin 

 slightly below the tip ; a short distance before this union the anterior 

 branch is connected by a crossvein with the posterior branch of the 

 preceding vein ; the other vein extends along the posterior margin of 

 the wing nearly to its middle, then unites with the posterior fork of the 

 preceding vein ; veins bearing several stout bristles ; halteres distinct ', 

 front femora considerably thickened, their tibiae rather slender, middle 

 femora rather robust, once and a third as long as the front ones, their 

 tibiae as thick as and nearly twice as long as the front ones, hind femora 

 and tibiie more slender than and nearly twice as long as the middle ones, 

 each femur bearing several bristles, the tibiae destitute of bristles ; first 

 four joints of the front and middle tarsi subequal in length, each slightly 

 broader than long, together slightly longer than the fifth, which is 

 considerably swollen ; first joint of the hind tarsi twice as long as wide, 

 as long as the two succeeding joints, the last joint swollen, as long as the 

 three preceding ones ; each tarsal claw bears a large lobe at the base 

 of the under side. Abdomen elongate-ellipsoidal, broader and slightly 

 longer than the thorax, bare except at each end and on the venter, where 

 there are a few bristles. Type, the following species: 



Pterellipsis aranea, n. sp. — Pale yellow, the abdomen opaque 

 grayish black, knob of halteres white, tarsal claws and the lobe at their 

 base black, bristles brownish yellow. Length 2 mm. Jamaica and 

 Montserrat, W. I. Three specimens taken on bats in caves by the late 

 Mr. H. G. Hubbard. Also 23 specimens collected on bats in Porto Rico 

 by Mr. A. Busck. Type No. 4208, U. S. Nat. Museum. 



Trichobius major, n. sp. — Reddish yellow, the abdomen largely gray- 

 ish black, halteres white, tarsal claws black, the latter lobed at base of the 

 under side ; thorax scarcely longer than high ; wings whitish yellow, veins 

 yellow, first vein reaching the costa near last sixth of length of wing; ab- 

 domen of female bare except a cluster of bristly hairs on each side near 

 the base and at the tip ; in the male the hairs in these four clusters are 

 much more numerous. Length 3 to 4.5 mm. Gum Cave, Citrus Co., 

 Florida, and Chiricahua Mts., Ariz. Fifteen males and sixteen females, 

 collected on bats by the late Mr. H. G. Hubbard. Type No. 4209, U. S. 

 Nat. Museum. 



Aspidoptera n. gen. — -Near Trichobius, but the wings reduced to ob- 

 long, coriaceous organs appressed to the body and not reaching beyond the 

 first fourth of the length of the abdomen, densely covered with rather long 

 bristles. Head in profile subquadrate, but the upper margin longer than 



