406 Professor Williston 07i the 



Table of Species. 



1. Wings distinctly spotted 2 



Wings not spotted 5 



2. Front vittate 3 



Front not vittate 4 



3. Wings with a blackish spot at the tip . . 2 vittatifrons, n. sp. 

 Wings with the cross-veins clouded .... 4 annulata, n. sp. 



4. Wings variegated 1 ornatipennis, n. sp. 



Wings with clouds on the cross- veins ... 3 sororia, n. sp. 



5. Mesonotum vittate 6 



Mesonotum not vittate 9 



6. Mesonotum deep brown with two narrow brownish stripes, 



as though continuous with the narrow frontal orbits; 



pleurae light-yellow 5 bllmeuta, n. sp. 



Not such marked species 7 



7. Tip of the lirst section of the costal vein black, 8fasciola, n. sp. 

 Tip of the costal vein not black 8 



8. Larger species ; thorax deep brown ... 6 coffeato, n. sp. 

 Smaller species, thorax yellowish 7 hellula, n. sp. 



9. Mesonotum deep black ; legs light- yellow 10 



Mesonotum not deep black 13 



10. Head and thorax deep shining-black 17 n. sp. 



Pleur£B in part at least light-yellow 11 



11. Head, mesonotum, scutellum and the upper part of the 



pleurse opaque velvety black 9 opaca, n. sp. 



Mesonotum and scutellum shining 12 



12. Abdomen black 11 pleuralis, n. sp. 



Abdomen with yellow and black markings . 10 thoracis, n. sp. 



13. Mesonotum brilliant blue or piM-ple ... 12 splendkla, n. sp. 

 Mesonotum not shining blue 14 



14 Mesonotum grey, with numerous small, rounded, dark 



brown spots 13 piinctulata, Loew 



Mesonotum not spotted 15 



15. Front legs black, with the four distal joints of the front 



tarsi light-yellow H procnemis, n. s,^. 



Front legs not black, with the distal joints of the tarsi 



yellow 16 



16. Front and face narrow ; the costal vein terminates at the 



tip of the third longitudinal vein. . \b frontal is, n. sp. 

 Front and face of the usual width ; the costal vein reaches 



the tip of the fourth longitudinal vein 17 



17. Mesonotum in ground-colour black, opaque brownish- 



greyish pollinose 18 pollinosa, n. sp. 



Mesonotum shining, reddish or yellowish 18 



