THE CANADIAN ENTOMOLOGIST. 179 



Flies." Upon comparison with a specimen in the United States 

 National Museum, of Cadopisthia vitripennis Thorns., one of the 

 two European species of the genus (not the genotype species), they 

 were found to differ materiallY- Unfortunately, specimens of the 

 genotype species, C. cephalotes Thoms., are not available for com- 

 parison, but there seems no reason to doubt that this species and 

 C. vitripennis are congeneric. A new genus is therefore erected 

 for the reception of the parasite of Cladins pectinicornis, which ap- 

 pears to be undescribed. 



Ccelopisthia nematicida (Pack) Hewitt and C. diacrisicc Crawf., 

 being congeneric with the new species, are also included. C. 

 fumosipennis Gahan is a true Ca'lopislhia and the only described 

 North American representative of that genus. C. smithii Ashm. 

 (manuscript name in Smith's Insects of New Jersey, 1900, p. 559) 

 does not belong in the tribe Pteromalini since one mandible is 3- 

 toothed and the other 4-toothed. It therefore falls in the tribe 

 Eutilini and does not appear to fit any genus in that tribe. 



The new genus is distinguished from all except Ccelopisthia 

 in the tribe Pteromalini by the immargined occiput, non-produced 

 propodeum, subequal stigmal and postmarginal veins, and the long 

 antennal pedicel. From Ccelopisthia it may be distinguished as 

 follows: 



Both antennal ring-joints elongate, as long or longer than broad; 

 discal cilia of the anterior wings reduced to mere 'dots or punc- 

 tures, the hairs obsolete; marginal vein nearly three times as 

 long as the stigmal; abdomen short, rotund . Ccelopisthia Foerster. 



First ring-joint strongly transverse, the second as long or nearly as 

 long as broad; discal cilia developed on the apical two-thirds of 

 the wing at least; marginal vein scarcely twice the length of the 

 stigmal; abdomen ovate or conic ovate. . . . Ccelopisthoidea, n. g. 



CaiLOPiSTHOiDEA, new genus. 

 Head large, much wider than thorax, broad anterio-posteriorly. 

 occiput concave, the occipital forminal depression angularh- defined 

 but immargined. Antenna? 13-j()inted, inserted on a line with the 

 lower extremities of eyes; scape slender; pedicel longer than the 

 first joint of funiclc; two ring-joints, the first transverse, the second 

 elongate, much longer than the first; funicle 6-jointed cylindrical; 

 club 3-jointed, acuminate. Face below the antenna^ receding; 



