psilopus. 283 



the first joint distinctly shorter than the tibia, upon its front side 

 somewhat sparsely ciliated with oblique minute black hairs ; the 

 following joints only with the usual short pubescence and of de- 

 creasing length, the last one dark brown. The length of the hind 

 tarsi somewhat exceeds three-fourths of the tibiae ; their first joint 

 is only somewhat longer than the following taken together; these 

 are of decreasing length, somewhat infuscated, still only the last 

 one dark brown. Halteres light yellow ; tegulse with extremely 

 narrow black margin and with yellowish-white cilia. Wings with 

 brown veins ; the anterior margin is gently sinuated upon its 

 larger second half, and forms before the tip of the second longitu- 

 dinal vein a projecting angle, so that the whole wing acquires a 

 quite unusual axe-like shape ; the whole anterior margin, as far as 

 that angle, is delicately and equally ciliated ; the third longitudinal 

 vein, near its end, is turned back very abruptly and unusually far; 

 the anterior branch of the fourth longitudinal vein diverges from 

 it under a rather acute angle and turns then in a curve towards 

 the margin, which it reaches not far from the tip of the third lon- 

 gitudinal vein ; posterior transverse vein rather remarkably oblique, 

 gently sinuated in the shape of an S. 



Female. It resembles the male very closely. Besides the 

 lesser length of the bristles on the whole body, and besides the 

 somewhat lesser length of the feet, which are of the same color as 

 in the J\ there are only the following differences : the whole hind 

 margin of the pleurae is colored with yellow. The middle titiiaa 

 are without the longer and erect pubescence of the J 1 , but their 

 pubescence is short and appressed as on the other tibice ; there 

 are, however, upon the front side near the basis one, and at the tip 

 of the tibiae a few more distinct minute black bristles, besides some 

 smaller ones upon the hind side. The anterior margin of the wings 

 is neither concave nor ciliated, the wings therefore of the usual 

 form ; the third longitudinal vein, near its end, is much less sud- 

 denly and much less strongly curved backwards ; the course of the 

 anterior branch of the fourth longitudinal vein is somewhat le.ss 

 in a curve, and the sinuosity of the hind transverse vein not so 

 strong. 



Bab. Florida. (Osten-Sacken.) 



