NO. 2128. NEW GENERA OF MUSCOID FLIES— TOWNi^END. 633 



ODONTOSOMA, new genus. 



Genotype. — Celatoria spinosa CoquiUett, Rev. Tach., 1897, p. 60 

 (TD 4383, female). 



Diflfei-s from Celatoria as follows: Female with liind lateral angies 

 of tergal sclerites of segments two and three bearing 8 to 10 strong 

 short spines in a patch, making four such patches showing on venter. 

 Male abdomen much more elongate. Front of female averaging less 

 than width of one eye, that of male less than half eye-width. Facial 

 depression very shallow. Antennae shorter. Apical cell narrowly 

 open. 



Fanuly PHASIIDAE. 



OEDEMATOPTERYX, new genus. 



Genotype. — Alopliora pulverea CoquiUett, Rev. Tach., 1897, p. 46. 



Differs from Alophoropsis as follows: Male frontaha narrowed by 

 parafrontals, which creep over them from each side in front of ocellar 

 area. Male wings characteristically swollen on costal cell, faintly 

 excavated on subcostal cell, more narrowed apically. Head, thorax, 

 and abdomen much more narrowed in proportion to length of body. 

 Abdomen heavily brassy-gray or gray poUinose in both sexes, opaque. 

 Vibrissae hairlike, usually not differentiated from the peristomal 

 bristles. No ocellar bristles. 



Alopliora fumosa CoquiUett also belongs to this genus. 



TRICHOCLYTIA, new^ genus. 



Genotype. — Clytiomyia atrata CoquiUett, Journ. N. Y. Ent. Soc, 

 vol. 3, 1895, p. 53. 



Differs from the genotype of Clytiomya (helvola Meigen; as foUows: 

 Front very narrow in both sexes, the eyes nearly contiguous. Abdo- 

 men clothed with fine hairs ; no discal macrochaetae, no marginal 

 row on second segment, at most very weak hairUke median marginal 

 pair on second segment. AU macrochaetae weak and bristlelike at 

 best. Facial plate like PhorantTui. Hind crossvein almost parallel 

 with apical crossvein and close to origin of latter, both being nearly 

 parallel with hind margin of wing. Claws of male extremely long. 



Holotype is a female from the State of Washington (O. B. John- 

 son). There are two males from Julietta, Idaho, in the coUection. 



