164 PROC. ENT. SOC. WASH., VOL. 20, NO. 8, NOV. 1918 



this one is here described as a new species (see quercworus) . The 

 female of this species characterized in the above key was col- 

 lected in Texas by Belfrage and is in the Museum Collection. 



Craterocercus quercivorus, new species. 



"F" Dyar, Can. Ent., vol. 27, 1895, p. 339. 



Hemichroa' fraternalis Norton: Dyar, Journ. N. Y. Ent. Soc., vol. 6, 1898, 



p. 124; MacGillivray, Conn. Geol. and Nat. Hist. Survey, Bull. 22, 



1917, p. 106. 



MacGillivray treats this as a species of Hemichroa, but it be- 

 longs more properly to the genus Craterocercus as the separation 

 of the genera Craterocercus and Hemichroa given by MacGilli- 

 vray (Bull. 22, Conn. Geol. Nat. Hist. Survey, 1917, p. 105), is 

 based on a character subject to individual variation. In some 

 specimens of this species the characters treated as generic, by Mac- 

 Gillivray, vary in the same specimen. 



Besides in the characters mentioned in the above table, this 

 species differs from fraternalis by the rufous mark on the upper 

 part of the mcsepisternum. It has been previously confused 

 with fraternalis Norton as the above references will show. 



Female. Length 8 mm. Clypeus shining, deeply subangulately emar- 

 ginate, the lobes narrow and triangular in outline; supraclypeal area nar- 

 row, strongly convex, almost keel-like; middle fovea oval, not breaking 

 through the frontal crest; frontal foveae large, confluent with the anten- 

 nal foveae; ocellar basin wider than eye, well defined, trapezoidal in outline, 

 open above; an oblique impression behind each lateral ocellus; postocellar 

 area flat, well defined, slightly more than three times as wide as long; third 

 and fourth antennal joints subequal; stigma three and one-half times as 

 long as its greatest width, gradually tapering from the base to the apex; 

 sheath broad, straight afcove, obtusely rounded at the apex, tapering to a 

 broad base. Black; pronotum, trochanters and knees white; prescutum, 

 mesepisternum dorsally and legs except where mentioned, rufo-ferrugi- 

 nous; abdomen piceous with the tergum, basally, and all of the sternum suf- 

 fused with ferruginous; wings hyaline, iridescent, venation dark brown, 

 costa'and stigma ferruginous. 



Male. Length 5 mm.; length of antennae 4.25 mm. Structural charac- 

 ters given in the above description apply well to this sex. Black; prono- 

 tum and tegulae white; legs below the trochanters except the infuscated 

 bases of the femora yellowish white; wings hyaline, venation dark brown, 

 costa and stigma pale brown. 



Type-Locality. Bronx Park, New York City, New York. De- 

 scribed from one female and four males (one allotype) reared from 

 larvae collected on Quercus alba, May 22. 1897, by H. G. Dyar, 



