448 PROCEEDINGS OF THE NATIONAL MUSEUM vol. uo 



3. A lightly sclerotized plate is present on the clypeus ventral to and continuous 



with the epistoma and dorsal to the anterior pleurostomal processes; in 

 Phaeogenes and in Diadromus (Given, 1944) the ventrolateral edges of the 



plate are prominent as sclerotized bars Phaeogenini 



A lightly sclerotized plate of this shape is not present on the clypeus .... 4 



4. Clypeolabral region with two slender and lightly sclerotized bands curving 



dorsaUy and with a line of setae which follows the curve situated beneath 



each band Platylabini 



Clypeolabral region without sclerotized bands of this shape and position i" . 5 



5. The sclerotized area lateral to each pleurostoma is almost as well sclerotized 



as the pleurostoma so that the lateral limit of the sclerite is not clearly 



defined Eurylabini 



If sclerotized area present lateral to each pleurostoma, then pleurostoma 

 more heavily sclerotized than this area and with lateral limit clearly 

 defined '' 6 



6. Setae and seusilla on clypeolabral region arranged in two elongate-oval areas 



with a circular area containing two sensilla beneath each oval area. 



Proticlmeumonini 

 Setae and sensilla of clypeolabral region not as above .... Ichneumonini 



The differences between most tribes are slight in this uniform 

 subfamily. During mounting the lightly sclerotized parts of the 

 cranium adjoining the epistoma are jQattened into various shapes. 

 The figures show this region as it appears in the preparations, but 

 it is unlikely that these shapes have any taxonomic significance. 



Tribe Phaeogenini ( = Aloniyini) 



Figure 28 

 Larval Key 



1. With a sclerotized bar extending across each ventrolateral edge of the lightly 



sclerotized plate on the clypeus Phaogenes 



Diadromus *^ 

 No sclerotized bar present along each ventrolateral edge of the lightly sclero- 

 tized plate on the clypeus Rhexidermus 



The following were examined: Phaeogenes ater (Cresson), P. 

 haeussleri Uchida, P. hariolus (Cresson) (fig. 28a) , P. hebrus (Cresson) , 

 P. vincibilis (Cresson), P. walshiae walshiae Ashmead, Rhexidermus 

 huardi (Provancher) (fig. 28b). 



The following are figured in the literature: Phaeogenes nigridens 

 Wesmael (Goidanich, 1931), Diadromus collaris (Gravenhorst) (Given, 

 1944), Proscus suspicax (Wesmael) (Beirne, 1941), Herpestomus 

 brunnicornis (Gravenhorst) (Beirne, 1943). 



" Except Pseudamblyteles (Ichneumonini) , where there is no line of setae beneath each sclerotized band 

 as in the Platylabini. 



1' Except Melanichneumon (Ichneumonini), where the numerous setae on the prelabium distinguish 

 this genus from Probolus. 



18 Of Given (1944). 



