218 HYMENOPTEKA. 



metapleurae more strongly ; upper keel on the metanotum turned backwards in the 

 middle ; spines conical, thick, obtuse. Areolet as long as broad, almost entirely open 

 at the apex, the recurrent nervure received in the centre. 



8. Mesostenus aztecus. 



Mesostenus aztecus, Cresson, Proc. Acad. Phil. 1873, p. 152 ( ? )\ 

 Eab. Mexico, Cordova 1 (Sumichrast). 



_ 9. Mesostenus propinquus. 



Mesostenus propinquus, Cresson, Proc. Acad. Phil. 1873, p. 152 ($ ? ) \ 

 Eab. Mexico, Cordova 1 (Sumichrast). 



10. Mesostenus compactus. 



Mesostenus compactus, Cresson, Proc. Acad. Phil. 1873, p. 153 ( ? ) x . 

 Eab. Mexico, Orizaba 1 (Sumichrast). 



11. Mesostenus discus. 



Mesostenus discus, Cresson, Proc. Acad. Phil. 1873, p. 153 ( ? )\ 

 Eab. Mexico, Orizaba * (Sumichrast). 



12. Mesostenus facilis. 



Mesostenus facilis, Cresson, Proc. Acad. Phil. 1873, p. 153 ( ? ) l . 

 Eab. Mexico, Orizaba x (Sumichrast). 



13. Mesostenus chiriquensis. 



Niger, flavo-varius ; pleuris sternoque flavis ; pedibus flavis, supra nigro-lineatis. $ . 

 Long. 14 millim. ; terebra 2 millim. 



Eab. Panama, Volcan de Chiriqui 2000 to 3000 feet (Champion). 



Antennae stout, longer than the body, the yellow ring on the flagellum broad. 

 Head punctured; yellow, except behind, the centre of the vertex, and the apex 

 of the mandibles, which are black ; vertex opaque, more roughly punctured than the 

 rest ; a stout carina runs down from the ocelli. Pro- and mesothorax punctured, the 

 pleurae longitudinally striated. Metanotum above the transverse keel closely punctured ; 

 a little way below it longitudinally striated, the striations converging towards the 

 centre ; the apical part transversely, the pleurae longitudinally, striated. The pleurae 

 and breast are entirely yellow ; the prothorax, except the prosternum and a small yellow 

 mark on the edge, black ; the mesonotum black, except a somewhat squarish mark on 

 the disc ; scutellum and postscutellum black ; the scutellar carinae are black. The 

 metathorax is yellow, except a broad black band extending from the base to a little 

 beyond the transverse carinae, and prolonged as a black line down the centre and 



