16 



Abdomen with very conspicuous clothing of decum- 

 bent silvery hairs C. argyrias. 



Abdomen at most with very sparse clothing of short 

 inconspicuous hairs ; or if the hairs are long and con- 

 spicuous, they are erect. 



Trochanters very long and with a thin basal stalk, at 

 least nearly as long as the thickened apical part. 

 Pronotum very distinctly emarginate in the middle of 



its anterior margin C. Icpfias. 



Pronotum not distinctly emarginate in front. 

 Head and pronotum largely black or very dark in 



color C. paralcptias. 



Head and pronotum bright brown or ferrugmous. 

 Front femora and tibiae clear testaceous . . C. ciiprcpcs. 

 Front femora and tibiae mostly pitchy. .C. cuprcpoidcs. 

 Trochanters not very long, dilating from, or close to, 

 the base, so that there is no long slender basal stalk. 



12 (13) Whole insect with clothing of fine, long, erect, pale 



hairs, those on the middle and hind femora and tibiae 

 long like the thoracic hair C. rapax. 



13 (12) Whole insect not so clothed, the middle and hind 



femora and tibiae with at most very short and gen- 

 erally inconspicuous hairs. 



14 (19) Posterior femora concolorous, except that the tips arc 



sometimies dark. 



15 (16) Fifth tarsal joint beneath with onlv a very short row 



of elongate hyaline lamellar denticles, this row begin- 

 ning beyond the middle of the length of the joint 

 from its base C. frcqncns. 



16 (15) Fifth tarsal joint beneath with rov/ of lamellate den- 



ticles very long and reaching to, or almost to, the 

 articular concavity. 



17 (18) Head scared} concave above, very dull, and exces- 



sively densely sculptured, third joint of antennae only 

 about twice as long as the second ; propodeum and 

 abdomen reddish C. solitoriiis. 



18 (17) Head very distinctly concave above, sculpture indis- 



tinct, nearly eflfaced, third antennal joint more than 



twice as long as the second; propodeum and abdomen 



black C. echo. 



19 (14) Posterior femora with the apical thin part conspicu- 



ously pallid ( as compared with the basal incrassate 

 part) being pale yellovv' or whitish. 



