Fossorial Ihjmcnoptcra of North America. 59 



Eucerceris laticeps, Cresson. 



E. laticeps, Cresson, Proc. v. p. 107. (1805.) 

 Massachusetts, (Hidings, Coll. Eat. Soc. Phil.). 



Eucerceris flavocinctus, Cresson. 



E. flavorincttix. Cresson, Proc. v. p. 100. (1865.) 



Rocky Mountains, Col. Terr., (Ridings, Coll. Ent. Soc. Phil.). 



Eucerceris cingulatus, Cresson. 



E. cingulatus, Cresson, Proc. v. p. 110. (1805.) 



Rocky Mountains, Col. Terr., (Ridings, Coll. Ent. Soc. Phil.). 

 " This may be the % of E. flavocinctus" Cresson. 



Eucerceris fulvipes, Cresson. 



E.fulvipes, Cresson, Proc. v. p. 111. (1S65.) 

 Rocky Mountains, Col. Terr., (Ridings, Coll. Ent. Soc. Phil.). 



Eucerceris canaliculars, Cresson. 



Philanthus canaliculatus, Say, West. Quart. Rep. ii. p. 79. (1823.) 



Amer. Ent. pi. 49. (1824.) 



"Arkansas," (Say). 



CERCERIS, Latreille. 

 Philanthus, in part, Fabr., Ent. Syst. ii. p. 288. (1793.) 

 Cerceris, Latr., Hist. Nat. Crust, et. Ins. xiii. (1804.) 

 Diamma, and Didesmus, Dahlb., Hym. Eur. i. 225 and 502. (1845.) 



Synopsis of the Species. 



A. Species of large size, wings clouded, clypeus exserted, raised and 

 forked or deeply excavated. 



% . Orbits yellow, femora black. 9- Body black, 



front trimaculate C. fumipennis, Say. 



% . Femora tipped with red ; front bilineate, clypeus 



raised, yellow C. clypeata, Dahlb. 



9- A square black mesial sinus in yellow band on 

 second abdominal ring, basal ring entirely 

 black; front entirely yellow C. venator, Cresson. 



9- Front reddish, concolorous with the legs ; propo- 

 deum reddish, with a mesial triangular black 

 spot; abdomen red; four yellow pale patches, 

 two on each two basal segments; clypeus raised, 

 deeply excavated C. bicornuta, Guer. 



9. Clypeus bifurcate, very prominent, abdomen yel- 

 low, with a broad basal triangular spot on each 

 ring C. biungulata, Cresson. 



9 • Front entirely yellow, femora yellow and red : two 

 yellow lateral spots on the basal abdominal ring 

 above C. sexta, Say. 



9. Clypeus with a square black spot, femora red, con- 

 colorous with entirely red ferruginous basal 

 ring C. vicina, Cres9on. 



