THE CANADIAN ENTOMOLOGlbT. 327 



Second cubital cell petiolate, receiving both recurrent nervurcs ; meta- 

 thoracic teeth small, acute; scutellum normal ; legs smooth,not 



spinous Hyponysson, Cresson. 



Subfamily IV. — Astatinse. 

 Distinguished from all the other subfamilies by the truncate, appen- 

 diculate marginal cell in the front wings, and by the antennae being 

 inserted far anteriorly, close to the clypeal suture. 



Fox has correctly pointed out the close relationship between his 

 genus Diploplectron and Dhieius, Jurine, but both genera are too closely 

 related to Astatus to warrant their sejjaration as a distinct tribe. 

 Four genera fall into this group, sej^arated as follows : 



Table of Genera. 

 Marginal cell along the costa, much longer than the stigma; eyes \\\^ 



holoptic ; front wings with three cubital cells 3. 



Marginal cell, along the costa not longer than the stigma, most fiequently 

 shorter; eyes in (^normal, not holoptic. 



Front wings with three cubital cells 2. 



Front wings with two cubital cells. 



Clypeus at apex in % 3-dentate ; tarsal comb distinct ; all tibiae 

 spinous : antennae in $ twisted, the scape much swollen, the 

 flagellar joints 1-6 compressed ; anterior tarsi 

 flattened Dinetus, Jurine. 



2. Clypeus medially convex, slightly produced anteriorly, without teeth ; 



tarsal comb long, distinct ; tibiae spinous ; antennte filiform, similar 

 in both sexes Diploplectron. Fox. 



3. Second cubital cell not receiving both recurrent nervures, the first 



recurrent nervure interstitial with or received a little before the first 

 transverse cubitus ; marginal cell not quite twice as long as wide ; 

 eyes in ^ not extending to base of mandibles ; pronotum in $ strongly 

 developed and not hidden beneath the anterior margin of the 

 mesonotum ; first cubital cell much longer than the second or third, 



nearly as large as both united Dryudella, Spinola. 



Second cubital cell receiving both recurrent nervures ; marginal cell 

 at least twice as long as wide, and still longer in the^J ; eyes m$ 

 extending to the base of mandibles ; pronotum in both sexes deeply 

 impressed beneath the anterior margin of the mesonotum ; first 

 cubital cell only slightly different from the second or 

 third Astatus, Latreille. 



