10. -i 



13. i 



428 C. R. OSTEN SACKEN'S PRODROME 



r Wings tinsjcd with V>rownish, but without distinct brownish boiTlcr posteriorly 10. 



9. \ Wings whitish in tlie middle, with a brownish border along the hind margin ; thorax gray, al)donien 



reddisli 8. vai'iegatus Fab. 



Head ( /, ) subliemispherieal ; prevailingcolor of the thora.x ( ,^ , $ ) grayish-black; of the abdomen (?) 



brownisii red with white triangles .-6. abdominalis Fab 



Head ( ,? ) but little different from that of the female ; prevailing color of the thora.x ( <^ , $ ) brownish 

 I gray or grayish brown ; abdomen yellowish brown with white tiiangies. ... 7. tectUS n. sp, 



r Abdomen black, with very distinct white triangles 12. 



[Abdomen reddish, witli very faint white tiiangies 11. tener n. sp. 



f A white triangle on second abdominal segment . . 9. molestus Say. 



12 J No white triangle on second abdominal segment; venter with a broad blown Imigitudinal 



I stripe 10. trimaculatus Fulisot. 



'Antennae black, third Joint sometimes reddish at base; abdomen on each segment, with a distinct bor- 

 der of gva}' pollen, expanding into a triangle in the middle 14. 



AntennfB reddisli, third joint more or less dark towards the end ; abdomen with triangles which are not 



the expansion of a border of gray pollen 15. 



("First posterior cell tlistinctly coarctate ; prevailing color of the tibiie whitish 12. melanocei'US Wied. 

 I First posterior cell not coarctate; prevailing color of the tibiaj black . . . 13. COfTeatUS Macq. 



r Front tibia; almost uniformly colored 14. Orion n. sp. 



^^- ] Distal half of the front til)ioB distinctly darker than the jiroximal 15. Actceon n. sp. 



f Wings with distinct black spots or clouds 17. 



16. i Wings without black spots or clouds 19. 



f Brown spots onlj^ on crossveins and on the bifurcation of third vein 18. 



17. i The brown .spots extend f;ir beyond the crossveins, and give the wing a variegated appear.ance . 



I 17. venustus n. sp. 



r The white triangles in the middle of the abdominal segments coalesce with the lateral obli<piu spots, 



18. ■' the segments being broadly margined with white posteriorly .... 16. cymatopliorus n. sp.. 



[The white triangles, etc., do not coalesce with the lateral oblique sjiots (see No. 41, 7'. Ji(jiiiu-((rdtii,) 



{Abdomen uniformly white; a distinct stump of a vein on the anterior branch of the fork of the third 

 vein 18. psammophiliis n. sp. 

 Abdomen with white triangles and white lateral spots on the segments 20. 



r The lateral spelts (in the abdominal segments touch the hind margin of the segments^ .... 21. 



I The lateral spots, etc., do «o< touch, etc 23. 



Upjier angle of the third ;mteniial joint drawn out in a long joint (see No. 42, T. cerastes). 



Upper angle, etc., no« drawn out in a longjioint 22. 



rPrev.ailin"- color of the ab(h:imen white 19. nivosus n. sp. 



\ Prevailing color of the abdomen black 20. vivax n. sp. 



r Middle sized, elongated species 21. longus n. si:). 



" 1 Small species, third antennal joint remarkably broad 22. pumilus Macq. 



r On each side of the median abdominal stripe there is a lateral stripe (composed of coalescent spots; 



24. \ sometimes indistinct) 25. 



1 On each side, etc., there is a longitudinal row of yellowish or whitish, not coalescent, spots . . .27. 



[Costal cell hyaline; ii-ont ($) distinctly convergent anteriorly 23. lineola Fab.-' 



^^" [Costal cell yellowish 26. 



[Face whitish; thorax gray, hind tibiae faintly brownish at tip .... 24. nigrovittatns Macq. 

 1 Face yellowish; thorax grayish yellow ; hind tibiae distinctly black at tip . . . 26. COStalis Wied. 





1 In order to obtain a n-ood view of this character, raise the etc., as on the second segment, the spots are sometimes very 

 specimen to about the level of your eye, with the tail end nearly contiguous with tlie hind margin, 

 towards you ; pay especial attention to segments three, four, 



