PROG. ENT. SOC. WASH., VOL. 20, NO. 8, NOV. 1918 171 



Hemichroa dyari, new species. 



Hemichroa americana (Provancher) ; Dyar, Can. Ent., vol. 25, 1893, p. J I I : 

 Can. Ent., vol. 27, 1895, p. 340; MacGillivray, Bull. 22, Conn. Geol. 

 and Nat. Hist. Survey, 1917, p. 106 (at least, in part). 



This species has been referred to in literature under the name 

 americana Provancher, but may be easily separated from that 

 species by the characters given in the above table. 



Female. Length 5.5 mm.; length of antennae 4 mm. Clypeus deeply 

 subangulately emarginate, the lobes triangular in outline; supraclypeal 

 area strongly convex; middle fovea large, shallow, more or less circular in 

 outline; frontal foveae deep, elongate; ocellar basin sharply defined; nearly 

 triangular in outline; antennal furrows interrupted above the frontal 

 foveae; postocellar area strongly convex, well defined, but little wider 

 than long; third antennal joint slightly longer than the fourth; stigma 

 about three times as broad as long, regularly rounded below; nervulus re- 

 ceived by the discoidal cell distinctly beyond the middle; sheath straight 

 above, truncate apically, tapering to a broad base. Rufo-ferrugihous; 

 antennae, apical margin of the clypeus, most of the mesosternum, the 

 metathorax dorsally, the four posterior femora, the apices of all the tibiae 

 and all the tarsi black; wings brownish, venation pale brown. 



Mule. Length 5 mm. ; length of the antennae 4 mm. Agrees with the 

 structural characters given for the female. Black; legs beyond the tro- 

 chanters except the apices of the posterior tibiae and all the posterior tarsi, 

 ferruginous; wings brownish, venation pale brown. 



Type-Locality. Woods Hole, Massachusetts. Described from 

 three females and three males reared from larvae collected on 

 Alnus, July 8, 1893, by H. G. Dyar, for whom the species is 

 named. 



Type. Cat. No. 21701, U. S. Nat. Mus. 



Hemichroa pallida (Ashmead). 

 Dine urn /mll'<la Ashmead, Bull. 1, Colo. Biol. Assoc., 1890, p. 15. 



Type. Cat. No. 9874. U. S. Nat. Mus. 



The type of this species is v>ry badly broken, only antennae 

 and win<>-s remaining. The above key points out the characters 

 which should separate this from th oth'-r females. 



The males here referred to pallida show the usual antigeny. 

 The color of the le-s is paler than in the male of <bjnri, and this is 

 also true in the female. 



Male. Length 5 mm.; length of the antennae nearly ."> mm. Clypeus 

 deeply, subangulately emarginate. the lobes broad and triangular in out line: 

 supraclypeal area sharply convex: middle fovea deep, elongate: frontal 



