124 BULLETIN 45, UriTED STATES NATIONAL MUSEUM, 



Logs pubetsct'iit, the i>osterior tarsi witb the first joint elongate, 

 joints li-4 subequal. 



The majority of the species in this genus are minute and closely re- 

 semble those in Aplwnofinnis Thorns., although they are readily sepa- 

 rated by the shape of the scutellum, which is broader, more tlattened, or 

 siibconvex, without a frenum, the antenna' in the males being lilitbrni, 

 not dentate or serrate, as in that genus. Apterous forms are (piite 

 <'ommon and will i)robably prove to be dimorphic forms of the winged 

 species. 



The records of rearings, with but few exceptions, show the group is 

 almost exclusively parasitic on the dipterous family Cecidomyida^ and 

 the homopterous family Aphididie. 



The species known to me in our fauna may be thus tabulated: 



TABLE OF SPECIES. 



FEMALK8. 



Winged forms 2 



Wingless forms. 



Brownish yellow, the vertex of head fnscous C. FUSCICEPS, sp. nov. 



Black, the base of abdomen pale or yellowish. 



Antcnnie, except scape at base, black C. MiNtJTi's Ashm. 



Wholly black, with wing pads. 



Legs golden yellow C. auripes, sp. nov. 



2. Wholly black 3 



Thorax and abdomen brownish yellow, the head black. 



C. MEULNOCEPHAIiUS Ashm. 



Head and thorax black. 

 Abdomen obscure rnfons or piceous, yellowish at base and beneath. 

 Shining, but distinctly i>unctulate; Bcape rufous, the flagellum black. 



C. PALLIDIVENTRIS, Sp. nOV. 



Polished, impunctured, angles of metathorax prominent; antenuie brownish- 

 yellow, 4 or ," terminal joints black C. basalis, sp. nov. 



Head and thorax brownish yellow ; abdomen black ; base and apex of front wings 

 hyaline C. californicus, sp. nov. 



3, Head and thorax distinctly, closely punctate. 



Pleura aciculated ; antennae brown ; legs brownish yellow. 



0. PUNCTATus, sp. nov. 

 Head and thorax smooth, or the punctuation exceedingly delicate. 

 Antenufe, teguhe, and legs black; pleura not aciculated; flagellum slender, 



the joints all longer than thick C. UNICOLOR sp. nov. 



Antenna;, togula', and legs brownish piceous; trochanters, tips of tibia>, and the 



tarsi yellowish white C. salicicola, sp. nov. 



Scape, tegulie, trochanters, knees, tibiae, and tarsi yellow; flagellum sjibcla- 



vate C. amplus, sp. nov. 



Scape and legs brownish yellow. 

 -- TegulfE black ; flagellum black, , 



Wings fuscous C. MELANOCERU8, sp. nov. 



Wings subhyaline C. pedalis, sp. nov. 



Teguhepale; antenna' brown, the scape and pedicel yellow; pedicel longer 

 than the tirst flagellar joint, smooth, highly polished. 

 Wings hyaline; flagellar joints 1 to 5 transverse, 6 and 7 quadrate. 



C. FLA Vise APU8, sp. nov. 



