346 MEMOIRS OF THE CARNEGIE MUSEUM 



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



antennse, very long Thysanus Ilaliday (type T. nter Hal.). 



12. Antennse 6-jointed 1.3 



AnteuniB 5-joiuted 17 



13. Antennie witb the three joints before the club unequal in lengtli 14 



Autennie 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 Eiitcdon abdomhialis 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, J the length of the abdomen Centrodora Forster (type C. amvena 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 peculiar pattern. 



Perissopterus Howard (type Aphelinus pulchellus How.). 



17. Ovipositor exserted ; mandibles 3-dentate Physcus Howard (type Coccophayus varicornis How.). 



18. Antenna; 6-jointed Aphelinus Dalman. 



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



Front wings without such a line. 



Antennse 8-jointed 20 



Antennte 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 tibise not armed with stiff bristles behind Prospalta Howard. 



Hind tibiie armed with stiff bristles behind Myiocnema Ashniead. 



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. 



2.5. Antennte 6-jointed 26 



Antennse 5-jointed. 



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



Antennse 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 inegular 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. 



Perissoptenis Howard. 



