HYMENOPTERA 219 



All coxae black. 



Legs rufous, the coxae, first joint of trochanters and hind tarsi (some- 

 times) black; cljpeus and mandibles, except teeth, tegulae, and the 

 extreme apices of dorsal abdominal segments 3 to 7, yellowish-white; 

 flagellum ferruginous. Female C. miiior. 



Legs brownish-yellow, with the middle and hind femora more or less 

 dusky or blackish ; clypeus and mandibles yellowish ; flagellum brown- 

 black. Male C. minor. 



Hind coxae alone black 6. 



All coxae rufous or pale, never black 7 • 



6. Face below the antennjE, but not along the orbits and on the cheeks, 



the clypeus, mandibles, palpi, tegulae, front and middle coxae and 

 trochanters, second joint of hind trochanters and tibial spurs, yellow- 

 ish-white ; flagellum brown-black. Female C. popofensis. 



7. Legs rufous, with the hind tibiae and tarsi more or less black or fuscous, 



the hind tibize with a rufous spot or broad band before the middle; 

 clypeus, mandibles, except teeth, and the hind angles of pronotum, 



pale yellowish ; tegulae brown. Female C. kukakensts. 



Legs pale ferruginous, with the tips of hind tibiae and tarsi black or 

 fuscous, the front and middle coxae and all trochanters yellowish- 

 white ; face below antennae including the clypeus, mandibles, a large 

 spot on each side of mesonotum anteriorly, tegulae, and a V-shaped 

 mark on each side of the mesosterum yellow. Male C. perplexus. 



All coxae pale 11. 



Hind coxae black 9. 



Hind coxie black. 



Dorsal abdominal segments 2 to 7 mostly rufous or rufous in 



part 10. 



Dorsal abdominal segments mostly black, with 2 to 7 narrowly 

 flavo-testaceous at apex. 



Face entirelj', a large spot en each side of the mesonotum anteriorly 

 and a large triangular mark on each side just above the mesosternum 



lemon-yellow. Male C. alaskensts. 



10. Clypeus, a lunate mark above and connected with it, mandibles, except 

 teeth, palpi, tegulae, front and middle coxae and trochanters, and the 

 tibial spurs, yellow or yellowish-white ; remainder of legs except the 

 apex of hind tibiK and their tarsi, which are black, rufous. Male. 



C. fflacialis. 



Face below antennae, clypeus, mandibles, scape beneath, a large spot 

 on anterior lateral margins of the mesonotum, a spot on each side of 

 mesosternum anteriorly, and the tegula; lemon-yellow; palpi, front 

 and middle coxa;, apex of hind coxce and all trochanters, except the 

 first joint of the hind pair above, and the venter, yellowish-white. 

 Male C. frigidus. 



