140 PROC. ENT. SOC. WASH., VOL. 20, NO. 7, OCT., 1918 



i 

 Third visible tergite not very short, distinctly much longer than 



the second and reaching to the middle of abdomen or nearly; 

 fourth tergite not longer than the three basal ones combined; 

 coxae, at least, black 8 



8. Funicle joints very distinctly pedicellate abnormicornis Ashmead 



Funicle joints not at all pedicellate 9 



9. Tegulae black; scape and flagellum dark; lateral margins of the 



pronotum not sharply angulated or margined tegularis n. sp. 



Tegulae not black, either pale or ferruginous; scape and flagellum 



more or less pale 10 



10. Lateral margins of the pronotum margined or sharply angulated; 



abdominal petiole strongly sculptured similaris n. sp. 



Lateral margins of pronotum rounded or at least not angulated or 

 margined; abdominal petiole more weakly sculptured 



cecidomyiae Ashmead 



Rileya megastigma Ashmead. 



Ashmeadia megastigma Ashmead, Journ. Linn. Soc. Lond. Zool. XXV, 



1894, p. 145. 

 Rileya migalostigma Schulz, Spolia Hymen., 1906, p. 148 (emendation). 



Female. Resembles heterogaster but may be easily recognized by the 

 fact that the stigmal knob is greatly enlarged, the diameter of the knob 

 being equal to the length of the stigmal vein basad of the knob. Head, 

 viewed from in front, subtriangular; malar space, in profile, not strongly 

 convex, shorter than the eye and without a carinate line between the 

 cheeks and face; antennal depression not margined; second tergite barely 

 visible as a very narrow, easily over-looked, margin around the first; 

 third about half as long as the first; fourth large; fifth and sixth subequal 

 and each about as long as the third; ovipositor tip exposed; propodeum 

 with a delicate but distinct, nearly straight transverse carina. 



Male unknown. 



Three females in the U. S. N. M. Collected on the island of 

 St. Vincent, West Indies. 



Riley collaris, Howard. 



Ashmedia collaris Howard, Journ. Linn. Soc. Lond. Zool. XXVI, 1896, p. 

 136. 



Placed in the key from the original description. Type, a 

 female, in the British Museum, London. Collected on the 

 island of Grenada, West Indies. 



