346 MEMOIRS OF THE CARNEGIE MUSEUM 



n. Front wings with long marginal cilia, dusky on basal half; club, or terminal joint of the 3-jointed 

 antennae, very long Thysanus Haliday (type T. ater Hal.). 



12. Antennae 6-jointed 13 



Antennae 5-jointed .17 



13. Antennae with the three joints before the club unequal in length 14 



AntennsB with the three joints before the club equal in length Mesidia Forster. 



14. Ovipositor prominently exserted 15 



Ovipositor not at all, or at most only slightly, exserted ; wings hyaline Aphelinus Dalman 



(type Entedon abdominalis Dalm.). 



15. Wings not wholly hyaline, maculate, or with rounded fuscous spots 16 



Wings hyaline ; with a brown band ; post-scutellum abnormal, extending to the base of the abdomen ; 



ovipositor prominent, ^ the length of the abdomen Centrodora Forster (type C. amcena Forst.). 



16. Wings hyaline, with rounded, fuscous spots Marietta Motschulsky (type M. leopardina Motsch.). 



Wings strongly maculate, with broad irregular fuscous bands and spots of a pecviliar pattern. 



Perissopterus Howard (type Aphelinus pulchellus How.). 



17. Ovipositor exserted ; mandibles 3-dentate Physcus Howard (type Coccophagus raricornis How.). 



18. Antennae 6-jointed Aphelinus Dalman. 



19. Front wings with a hairless oblique line ; antennae 5- or 6-jointed 25 



Front wings without such a line. 



Antennae 8-jointed 20 



Antennae 3-jointed. 



Wings with long marginal cilia Thysanus Haliday. 



20. Front wings with the marginal cilia short 21 



Front wings with the marginal cilia long 23 



21. Marginal vein much shorter than the subcostal vein 22 



Marginal vein as long as or longer than the subcostal vein Coccophagus Westwood. 



22. Hind tibiae not armed with stiff bristles behind Prospalta Howard. 



Hind tibiae armed with stiff bristles behind Myiocnema Ashmead. 



23. Front wings broadly rounded at apex, the stigmal vein present 24 



Front wings narrowed and pointed at apex, the stigmal vein absent Aspidiotiphagus Howard. 



24. Unknown Ablerus Howard. 



Encarsia Forster. 



25. Antennae 6-jointed 26 



Antennae 5-jointed. 



26. Antennae with the three joints before the club of an unequal length 27 



Antennae with the three joints before the club of an equal length Mesidia Forster. 



27. Wings not wholly hyaline. 28 



Wings wholly hyaline Aphelinus Dalman. 



28. Wings with rounded fuscous spots or strongly maculate with fuscous bands and irregular spots 29 



Wings hyaline except a fuscous band Centrodora Forster. 



29. Wings with rounded fuscous spots Marietta Motschulsky. 



Wings strongly maculate with broad irregular fuscous bands and spots of a peculiar pattern. 



Perissopterus Howard. 



