602 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BuU. 



CHRYSIDOIDEA. 



CHRYSIDID^. 

 The cuckoo wasps or gold wasps. These most beautiful of 

 all the wasps in the state are guests or parasites in the nests of 

 bees and wasps. 



Key to Genera. 



1. Tongue not longer than thorax 2 



Tongue longer than thorax, bee-Hke Pamopes p. 605 



2. Third abdominal segment without submarginal grooves or 



pits 3 



Third abdominal segment with submarginal (grooves or 



pits; head as broad or broader than postscutellum 



Chrysis p. 604 



3. Tarsal claw with 2 to 6 teeth besides apical tooth 4 



Tarsal claw different 5 



4. Apical abdominal segment not produced as if pinched; apical 



margin of third abdominal segment notched, rounded 



Omalus p. 602 

 Apical abdominal segment produced as if pinched; apical 

 margin of third abdominal segment emarginate, the emar- 

 gination filled or partly filled with a membrane Notozus p. 603 



5. One small perpendicular tooth in middle of tarsal claw 



Hedychridium p. 603 

 Tarsal claws cleft Hedychrum p. 603 



Omalus Jurine. 

 Key to Species. 



Two teeth within tarsal claw iridescens 



Three to six teeth within tarsal claw, notch much wider than 



deep corruscans 



Notch as broad as deep sinuosus 



*0. iridescens Norton. 



Length 3-5 mm. ; margin of the third abdominal segment 

 semi-transparent yellowish. 



O. corruscans Norton. 



Length 6.5 mm. Parasitic upon the wasp Diodontus ameri- 

 canus, and another wasp, Stigmus americanus. 



