SCIAKA. 51 



costal vein little more than one-fourth of the iength of the winrj ; ratlial 

 a little more than two-thirds ol' the leiigili ; cubital simple, ending at a 

 little in front of the tip ; subapical emerging from the cnbital before 

 one-third of the length, forked before two-thirds of the length ; snb- 

 anal and anal diverging to the posterior margin; suhanal simple; axil- 

 lary and subaxiUary rudimentary ; humeral veinlet very near the base. 

 Areolets ten — the humeral, the subcostal and the radial, which are 

 partly united, the pra^brachial, the pobrachial, the cubital, the subapi- 

 cal, one externo-medial, the anal, and the axillary. Posterior margin 

 forming a slight acute angle at a little beyond the length of the humeral 

 areolet from the base. Halteres rather long. Abdomen elongated, 

 nearly linear. Le(js slender, of moderate length ; coxte rather large ; 

 tibice toithout spines, their spurs rather short. Male. Anteuna3 nearly 

 as long as the body. Abdomen bilobed at the tip. Fern.. Antennae 

 not more tliau half the length of the body. Abdomen attenuated at 

 the tip. 



The larvse of this geuus dwell iii Boleti, fungi, putrescent galls, 

 uud beneath the bark of felled trees, and at the decayed roots of 

 vegetables. The larva of S. vitrijiennia is exactly like that of 

 Mycetopjldla fusca, but does not sjnn a cocoon; the pupa diilers 

 in having two divergent caudal setas, and its head is cleft in front. 

 Synopsis of the species : — 



a. Eadial vein extending beyond the fork of the subapical. 

 h. "VYings blackish. 



c. Sides of the abdomen luteous. Species 1. 

 c c. Sides of the abdomen black. Species 2. 

 h h. A\'ings grey. 



c. Legs piceous. Species 3. 

 c c. Legs testaceous. Species 4, 5. 

 b b. "Wings nearly linij)id. Species G. 

 a a. lladial vein extending to the fork of the subapical. Species 7, 8. 

 a a a. Radial vein not extending to the fork of the subapical. 

 h. Halteres piceous or brown, 

 c. Wings brown. Species 9. 

 c c. AVings grey. Species 10. 

 6' c c. Wings limpid, or nearly so. 



d. Subapical and subanal veins dark. Species 11, 12. 

 d d. Subapical and subanal veins whitish. Species 13, 14. 

 b b. Halteres testaceous, with blackish knobs. Species 15, 16. 

 b b b. Halteres testaceous or whitish. 

 c. W^ings complete. 



d. Body black or brown. 



e. Suljapical and subanal veins blackish. Species 17. 

 e e. Suba[)ical and subanal veins pale. 

 /. Ijody rather slender. Species 18, 19. 

 //. Body very slender. Species 20. 

 d d. Body tawny. Species 21. 



