PROC. ENT. SOC. WASH., VOL. 20, XO. 1, JAN, 1918 19 



Microbracon cephi, new species. 



This species resembles M . lisi Ashmead and M .furtlrns Fyles but maybe 

 distinguished by the shorter ovipositor. The male is very similar to .17. 

 rhyssemati Ashmead but may be separated by the longer antennae and 

 smoother .propodeum. The cocoons of rhi/xxciiifili arc dark brown with 

 thicker walls than in this new species which has pale parchment-like co- 

 coons, squarely truncate at each end and placed singly in the burrows of 

 its host. 



Female. Length 4.1 mm. Antennae 38-jointed in the type; frons and 

 face very delicately and faintly shagreened, remainder of head and thorax 

 polished; propodeum faintly sculpture at posterior middle on each side of 

 the incomplete median carina; abdominal tergites all granularly opaque; 

 suturiform atriculation deep, crenulate, and scarcely at all angled at the 

 middle but curving forward slightly at the margins of segment; ovipositor 

 exserted not over half the length of abdomen. Color reddish testaceous; 

 antennae, eyes, ocelli, ovipositor sheaths, apex of hind tibiae, their tarsi, 

 and the apical joint of fore and medium tarsi black or blackish; wings sub- 

 hyaline, the stigma blackish, venation brownish. 



Male. Length 3.5 mm. Antennae 40-jointed in the allotype, and dis- 

 tinctly longer than the body; posterior tibiae and their tarsi only slightly 

 infuscated; otherwise like the female. 



Type locality. Bottineau, North Dakota. 



Type. Cat. No. 21772, United States National Museum. 



Host. Larva of Cephus cinctus Norton. 



Type and one female paratype reared by Mr. Ainsliefrom Cephus 

 cinctus infesting stems of 'Agropyron and recorded under Webster 

 No. 14788. Allotype and a male paratype bear Webster No. 

 13734 and were reared by the same collector at Minot, North 

 Dakota from the same host in stems of Elymus. Two female 

 paratypes are from the same host in stems of Bromus from Rugby, 

 North Dakota, and are recorded under Webster No. 14786. One 

 female paratype was reared by Mr. Norman Griddle at Treesbank, 

 Manitoba, from Cephus cinctus in the stems of Elymus canadensis 

 and is recorded under Webster No. 14788. 



The last mentioned paratype has the head above the mesoscti- 

 tum for the most part and the propodeum blackish, showing that 

 the species is variable in color. 



SOME MUSCOID SYNONYMY, WITH ONE NEW GENUS. 



BY CHAKM:S II. T. TOWXSEND. 



The following synonymic notes hav.> been held in manuscript 

 for a year and should be puNis'inl without further <l<'lay. 



Xenoppia hypopygialis Towns. -Synonym, ('(i>njilt>j>i/'j<t nrix/ulu Aid., 

 Sarc. & Allies, 41 .'>. genus and species. 



