PSILOPUS. 245 



- e Middle tibiae of the % with strikingly long spurs. 13 calcaratus Lw. 



\ Middle tibiae of the without long spurs. 14 inermis Lw. 



,,( Antennae entirely black* 15 scintillans Lw. 



\ Two first joints of the antennae yellowish. 16 



, fi ( Fore femora without thorn-like bristles upon the under side. 17 



( Fore femora with yellowish thorn-like bristles upon the under side. 20 

 , ( Abdomen at the basis not yellow. 16 pallens Wied. 



I Abdomen at the basis yellow [not metallic]. 18 



, o ( Tarsi for the most part, black. 17 variegatus Lw. 



I Tarsi but little infuscated towards the tip. 19 



, n ( All the coxae entirely yellow. 18 bicolor Lw. 



\ Middle coxae gray with yellow tip. 19 psittacinus Lw. 



an ( All the coxae entirely yellow. 20 tener Lw. 



\ Middle and hind coxae blackish. 21 filipes Lw. 



Systematic arrangement of the Species, 



I. Tegulse with black cilia. . 



A. Wings with a dark picture. 



A. Wings black, only the tip and the hind margin hyaline. 



1. dimidiatus Lw. 



B. Wings hyaline with two fasciae connected at the anterior mar- 



gin. 



2. sipho Say. 5. melampus Lw. 



3. scaber Lw. 6. pilosus Lw. 



4. patibulatus Say. 7. jucundus Lw. 



B. Wings without dark picture. 



A. First longitudinal vein reaching far beyond the middle of the 



wing. 



8. ciliatus Lw. 



B. First longitudinal vein reaching at the utmost but to the mid- 



dle of the wing. 



1. Arista apparently apical and remarkably elongated. 



9. comatus Lw. 



2. Arista distinctly dorsal and not remarkably elongated. 



a. In the only the fore tibiae, in the j also the middle 



tibiae, yellow. 



10. chrysoprasiua Walk. 



b. In the all tibiae, in the 9 a l go all femora, yellow. 



11. scobinator Lw. 13. calcaratus Lw. 



12. caudatulus Lw. 14. inermis Lw. 



