10.^ 



13 



428 C. R. OSTEN SACKEN'S PRODROME 



{Wings tingeil with brownish, but without Jistinct brownish border posteriorly . . . . . . 10. 

 Wings whitish in the middle, with a brownish border along tiie liind margin ; thorax gray, a\)domen 

 reddish 8. variegatus Fab. 



Head ( f, ) subhemispherical ; jirevailingcolor of the thorax ( 6 , ? ) grayish-black; of the ab<loinen (?) 



brownish red with Avhite triangles 6. abdominalis Fab. 



Head {$) but little different from that of the female; prevailing color of the thorax ( (J , $ ) brownish 

 I gray or grayish brown ; abdomen yellowish brown with white triangles. ... 7. tectus n. sp. 



r Abdomen black, with very distinct white triangles 12. 



1 Abdomen reddish, with very faint wliite triangles 11. tener n. sp. 



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



12. -{ No white triangle on second abdominal segment; venter with a broad brown longitudinal 



[ stripe 10. trimaculatus Palisot. 



Antenna; black, third joint sometimes reddish at base ; abdomen on each segment, with a distinct bor- 

 der of gray pollen, expanding into a triangle in the middle 14. 



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



the expansion of a border of gray pollen 15. 



f First posterior cell distinctly coarctate ; prevailing color of the tibi;e whitish 12. melanocenis Wied. 

 I First posteiior cell not coai-ctate ; prevailing color of the tibiiB black . . . 13. cofTeatus Macq. 



[Front tibiaj almost uniformly colored 14. Orion n. sp. 



^°- I Distal half of the front tibias distinctly darker than the proximal 15. Actaeon n. sp. 



r Wings with distinct black spots or clouds 17. 



16. i Wings without black spots or clouds 19. 



(Brown spots only on crossveins and on the bifurcation of third vein 18. 

 The brown spots extend far beyond the crossveins, and give the wing a variegated appearance. 

 17. venustus n. sp. 

 ("The -white triangles in the middle of the abdominal segments coalesce with the lateral oblique spots, 

 18. i the segments being broadly margined with white posteriorly .... 16. cymatophorus n. sp. 

 [The white triangles, etc., do not coalesce with the lateral oblique spots (see No. 41, T. lieiiucardtii,) 



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

 vein 18. psammophilus n. sp. 

 Ab<lomen with white triangles and white lateral sjiots on the segments 20. 



r The lateral spots on the abdominal segments touch the hind margin of the segments' . . . .21. 



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



fUpjier angle of the third antennal joint drawn out in a long joint (see No. 42, T. cerastes). 



■ [Upper angle, etc., ?J0< drawn out in a long point 22. 



r Pre vailinir color of the abilomen white 19. nivosus n. sp. 



*"" 'i Prevailing color of the abdomen black 20. vivax n. sp. 



[Middle sized, elongated species 21. longus n. sp. 



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



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

 sometimes indistinct) 25. 

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



fCost.al cell hyaline; front (?) distinctly con veigent anteriorly 23. lineola Fab. 



I Costal cell yellowish 20. 



[Face whitish; thorax gr.ay, hind tibiic faintly brownish at tip .... 24. nigrovittatus INIacq. 

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



1 \n order to obtain a "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 tlie tail end nearly eontiguous with the hind m.argin. 

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



25. 



