PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 74 



, Spiracles of first segment at or not far behind middle (fig. 2b-d), the seg- 

 ment in female either narrow throughout or subclavate; propodeum 

 with more or less distinct basal carina, but with apical carina wanting 



or at most faintly indicated laterally (fig. 3c and I) 3 



Spiracles of first segment far behind middle (fig. 2e-h) 4 



Clypeus broadly truncate without an apical tooth ; first segment sublinear, 

 curved, the spiracle at or slightly behind middle (fig. 2b) ; propodeum 

 (fig. 3c) shining, posteriorly evenly transversely striate; longer hind 

 calcarium reaching beyond middle of basitarsus (fig. 7). 



Messatoporus, new genus. 



Fig. 1. — Head of: a. Listkognathus albomaculatus (Crbsson), Doe- 

 sal View ; ft. Same, Lateral View of Lowee Part to Show Occipital 

 Caeina (oc) and Htpostomal Caeina {he) ; c. Listrognathcs agnatds 

 Cdshman, Lateral View of Lowee Part ; d. Polyaenus spinaeius 

 (BEULLfi), Dorsal View; e. Mesostenus leucopus Ashmead, Dorsal 

 View ; f. Polycyrtus neglectos Cdshman, Dorsal View ; ff. Poly- 

 cyktidea limitis Cushman, Dorsal View 



Clypeus medially angulate or toothed ; first segment subclavate, straight, the 

 spiracles slightly behind middle (fig. 2c-d) ; propodeum (fig. 31) very long, 

 posteriorly opaque rugoso-punctate ; longer hind calcarium not or barely 

 reaching middle or basitarsus Mallochia Viereck. 



4. Propodeum not completely areolated, nearly or quite without longitudinal 



carinae, rarely with areola more or less defined 5 



Propodeum nearly completely areolated (fig. 3m) Polistiphaga Cushman. 



5. Postpetiole in female broad, the stemite not or barely reaching the spir- 



acles (fig. 2e-f), in male sternite rarely reaching beyond spiracles and 



then only slightly beyond 6 



Postpetiole in female naiTOw, the sternite reaching distinctly beyond the 

 spiracles (fig. 2g-h), in male far beyond, if not so the areolet is very 

 long and narrow 9 



