Fossorial JUi/menoptera of Kortli America. 73 



F. ricad transversely cubical; species long and slender; abdomen 8- 

 spotfced, with a terminal band in % . 



%. Fore femora rufous. 9- Tipof abdomen broad tri- 

 angular C. pauper, Packard. 



%. Antenna! strongly bidentate j anterior and middle 



femora tipped with yellow ; tarsi yellow C. denticulatus, Packard. 



9- Enclosure of propodeum with seven large fossae; 



tarsi In-own C. tenuiglossa, Packard. 



G. 9 • Head broad and short; body stout, elongated, abdomen longer 

 than head and thorax together; tip of abdomen pinched, deeply 

 channelled, abdominal fasciae acute above, narrow. 



9- Basal abdominal ring spotted; middle femoraonly 



tipped with yellow C. obscurus, Smith. 



% . Like C. obscurus, but clypeus silvery C. montanus, Cresson. 



9- Terminal abdominal fasciae orbicular, united : fore 



ami middle femora slightly tipped with yellow. .C. contiguus, Cresson. 



//. Head subcubical ; species of small size. 



a. %. 2*100 terminal abdominal bands. 



%. Prothorax yellow, crested; baso-abdominal bands 



present C. cristatus, Pack. 



% . Basal joint of the abdomen immaculate; femora 

 brown : head cubical; antennae scarcely denticu- 

 lated; propodeum finely striated C. brunneipes, Pack. 



% . Propodeum with no mesial furrow, with very 



coarse fossae. Head very narrow C. effossus, Pack. 



b. Five pairs of short, ovate abdominal fasciae. 



9. Terminal pair round: scape yellow C. cubiceps, Pack. 



9 . Enclosure of propodeum very coarsely corrugated ; 

 tip of abdomen unusually compressed and nar- 

 row C. corrugatus, Pack. 



9. Terminal round abdominal, spots unusually dis- 

 tant; thorax and femora black C. parvulus, Pack. 



I. Antennae simple slender; head short and broad, abdomen longer 

 than head and thorax together, with two or three terminal continu- 

 ous bauds. 



%. Fore femora black, clypeus yellow. 9- Clypeus 



long, mandibles yellow, tip pinched C. septentrionalis. Pack. 



J. Head very cubical ; abdomen much shorter than the rest of the 

 body, which is rather coarsely punctured ; first segment coarctate ; 

 second ring usually with broad fasciae either separate or united. 

 % 9 • No fascia? on third abdominal segment, meso- 

 scutellum and meta-scutellum striped ; species of 



under size C. stirpicola, Pack. 



9- Short and broad stripe on third abdominal ring : 

 meso-scutellum entirely yellow, front of head 

 golden C. croesus, St. Farg. 



PROCEEDINGS EXT. S0C. PHILAD. MAY, 1866. 



