*SILOPUS. 231L 



spersed now and then with a little black hair. Tibias of the male 

 brown, near the root black-brown ; the middle tibiae on the out- 

 side with a regular row of obliquely inserted black bristles ; on the 

 outside of the fore tibias there is a row of five or six black bristles, 

 which does not reach as far as the tip ; the hind tibia? are without 

 bristles. Tibiae of the female yellow, near the root brown ; the 

 fore and middle tibiaa with a few sparse bristles ; the hind tibiae, 

 as in the male, without bristles. Tarsi black-brown, those of the 

 female less dark than those of the male, in both sexes plain ; the 

 fore tarsi of the male are about 1^ the length of the tibiae, their 

 first joint is about 1^ the length of the following joints together, 

 and beset upon the middle of the outside with two black bristles ; 

 its middle tarsi are not quite l the length of the tibiae, their first 

 joint is more than 1^ the length of all the other joints together, 

 and beset with a few black bristles ; its hind tarsi are somewhat 

 stout, shorter than the hind tibiae, and their first joint not much 

 longer than all the others together. The fore and middle tarsi of 

 the female are somewhat shorter than those of the male, and their 

 first joint is much less elongated ; its hind tarsi are more slender 

 than those of the male. The tegulae have a black margin, and are 

 fringed with long black cilia. The halteres of the male are brown- 

 black, those of the female yellow. Wings hyaline with the usual 

 two black bands, united on the anterior margin and abbreviated 

 before the posterior margin ; they expand in a rather unusual 

 manner, and coalesce again upon the fourth longitudinal vein, so 

 as to enclose a large drop in the first cell of the posterior margin ; 

 on the anterior margin the darker coloring begins rather far before 

 the end of the first longitudinal vein, and does not reach to the end 

 of the third vein ; the anterior branch of the fourth longitudinal 

 vein forms an acute angle with it and turns then at a somewhat 

 rounded angle of about eighty degrees towards the tip of the 

 wing, pursuing this course in a rather straight line ; the posterior 

 transverse vein is straight, has, however, a somewhat oblique 

 position. 



Hob. Rio Janeiro. (Coll. Wied. and Winth.) 



10. caudatus Wied. Wiedemann's statements seem to prove beyond 

 doubt, that this species belongs to the relationship of P. scobinator ; 

 among the species of this kind I know but one which, like caudatus, 

 is distinguished by the extraordinary length of the hairs at the ex- 



