288 THE CANADIAN ENTOMOLOGIST. 



3. Eyes arched; ocelli large; scape shorter than the first joint of the 



flagellum (3) Embolemus, Westwood. 



(Type E. Ruddii, Westvv.; 



4. Pronotum shorter than the mesonotum, without a median sulcus ; 



scape much shorter than the first joint of the flagellum ; stigma in 

 the front wings three or more times longer than 



thick (3) Embolemus, Westwood. 



Pronotum as long as the mesonotum, with a deep median sulcus ; 

 scape much longer than the first joint of the flagellum ; stigma in 

 front wings not twice as long as 



thick (4) Ampulicomorpha, Ashmead. 



(Type A. confusa, Ashm.) 



Subfamily III. — Dryininae. 



This natural group is easily recognized by the antennae, which are 

 10 jointed in both sexes, and by the shape of the head, which is quite 

 different in shape from that in the Uethylince and the Embolcm'mce. 



The species in their habits and development also differ from the 

 others, all of them being parasitic upon the nymphs of various Rhynchota, 

 belonging to the suborder Homoptera, the families Fulgoridse, Cercopidae, 

 Membracidx and Jassidre being especially subject to their attacks. 



Table of Genera. 



1. Males 7. 



Females. 



Vertex convex, not impressed 3. 



Vertex deeply impressed or concave ; anterior feet chelate. . . . 2. 



2. Wingless, without a scutellum (1) Gonatopus, Ljungh. 



(Type G. pedestris, Ljungh.) 



Winged, with a scutellum (2) Dryinus, Latreille. 



(Type D. formicarius, Latr.) 



Front wings with an oval or ovate stigma 4. 



Front wings with a narrow or lanceolate stigma ; front feet chelate. 



Pronotum not quite as long as the mesonotum, much contracted ; 

 fourth joint of front tarsi not much longer than the third, the 

 first twice as long as the three following united ; maxillary 



palpi 4-jointed (3) Bocchus, Ashmead. 



(Type B. flavicollis, Ashm.) 



Front tarsi not chelate 6. 



Front tarsi chelate 5. 



o- 



