562 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.50. 



condition for generic diagnosis, and it is not unlikely that the acces- 

 sion of fresh material will necessitate the removal of both species from 

 the genus. Types or any other specimens of A. immaculatus Howard, 

 A. amoenus Howard, A. Tiederaceus (Westwood), A. punctipes (Dal- 

 man), A. pliilippiae Martelli, and A. nitens Kourdumoff have also not 

 been available for study, but there is no reason for believing that any 

 of these is not now properly placed. 



For the convenience of the student a table of the genera herewith 

 proposed has been drawn up, including those forms that have been 

 or are most likely to be confused with Aphycus but excluding Ana- 

 gyrus and Pardleptomastix, which properly belong to the Ectromini and 

 need not cause confusion if careful attention is paid to tribal charac- 

 ters. The table also includes the genus Astymachus Howard, placed 

 near Aphycus in Ashmead's tables, but excludes Heterathrellus 

 Howard, which is an Ectromin,e and should run next to Anagyrus in 

 any natural classification. It may be pointed out, also, that Ashmead 

 was wrong in trying to separate Astymachus from Aphycus by the 

 alleged absence and presence of the postmarginal vein in the respec- 

 tive genera. The postmarginal is wanting or, more properly speakmg, 

 reduced to a mere spur in both of these genera. Attention is called 

 to the abdominal character made use of in the following table. Un- 

 fortunately it is one not always readily made out in dry material, 

 although easily seen in fresh specimens and usually also m balsam 

 mounts. As it plays a large part in the economy of the insects, 

 either causing or havmg been brought about by different habits of 

 oviposition, it has consequently great taxonomic importance. AH 

 of the genera here treated have a nonmetallic coloration. 



ANALYTICAL KEY TO GENERA. 



1. Mandiblea short and thick with equal or nearly equal teeth 5. 



Mandibles comparatively long and slender with noticeably unequal teeth; ovi- 

 positor inclosed by the 5th ventral sclerite 2. 



2. Funicle of antennae 5-jointed 3. 



Funicle of antennae 0-jointed Pseudococcobius, new genus. 



3. Front and vertex not punctate, cheeks longer 4. 



Front and vertex punctate, cheeks as short as width of eyes. 



Bothriocracra, new genus. 



4. Two upper teeth of mandibles nearly equal, lower tooth more basal and smaller. 



Acerophagus Smith. 

 Upper and lower teeth of mandibles equal, middle tooth larger and very sharp. 



Pseudaphycus Clausen. 



5. Fifth ventral sclerite reaching about to the middle of the venter, ovipositor free . . 6. 

 Ovipositor inclosed by the 5th sclerite, which reaches to the anus. 



Aenasioidea Girault. 



6. Postmarginal vein short and spurlike, no longer or not so long as the marginal. . . 7 

 Postmarginal well developed, nearly as long as the stigmal, antennal scape rather 



short, clavate cylindrical and fiu:rowed at apex Aphycopsis, new genus. 



