No. 22.] HYMENOPTERA OF CONNECTICUT. 653 



Abdomen without a constriction between first and second 

 ventral segments 8 



6. Clypeus with a lobe at dorsal middle; antennae inserted well 



above clypeus near middle of face; intermediate tibiae with 



two apical spurs Philanthin^ p. 671 



Clypeus with dorsal margin nearly straight; antennae inserted 

 very close to dorsal margin of clypeus, much below middle 

 of face 7 



7. Inner margins of eyes deeply emarginate; intermediate tibiae 



with one apical spur TRYPOXYLONiNiE p. 675 



Eyes at most reniform, mesal margins subparallel; inter- 

 mediate tibiae with two apical spurs Mellinin^ p. 6^^ 



8. Intermediate coxae without a transverse suture near base;, 



propodeum long, with spiracles well removed from base; 

 abdomen with a long petiole; intermediate tibiae with two 



apical spurs Sphecin^ p. 678 



Intermediate coxae with a transverse suture near base; pro- 

 podeum shorter, and with spiracles close to metanotum; 

 abdomen usually sessile, but, when petiolate, intermediate 

 tibiae have only one spur 9 



9. Metasternum with a large process which is deeply emarginate 



ventrally; intermediate tibiae with one apical spur; wings 

 with three cubital cells; radial cell with an appendage .... 



Larking p. 683 

 Metasternum without a large, deeply emarginate process.. 10 

 10. Abdomen depressed, dorsal surface flattened; intermediate 

 tibiae with two apical spurs; radial cell truncate; wings with 



three cubital cells Astatine p. 687 



Abdomen cylindrical or in a very few cases subdepressed, 

 dorsal surface convex; intermediate tibiae with one apical 

 spur; venation various Pemphredonin^ p. 688 



Nyssonin^. 

 As used here, this subfamily is the family Nyssonids of 

 Ashmead with the subfamily Astatinae removed. Following 

 Kohl's arrangement, it is the " Gattungsgruppe " Alyson and the 

 isolated genera Gorytes and Nysson. In Viereck's arrangement 

 in the New Jersey List it is the families Gorytidse, Alysonidae and 

 Nyssonidae. The subfamily is easily recognized by the prepectus. 

 But little is known about the habits of these insects. The 

 Nyssonini nest in sand as do also the Gorytini and Hoplisini. The 

 latter two provision their nests with Homoptera and according 

 to Westwood prefer those of the family Cercopidae. 



