AMERICAN IIYMENOPTERA. 79 



4. Second submarginal cell with two recurrent nervnres. 

 23. EUUEA. Newman. 

 Euura, Newman, Ent. Mag., iv., 18o7,2y8. 

 Pristiphora, ff, Lepel, Mon. Tenth, 60. 

 Pristiphora, B, Stephens, Br. Ent. Mand. vii., 26. 

 Pteronus, Farm. 2, Jurine. 

 Cryptocampus, I. Hartig. Die Blattwespen. 



Wings^ one marginal, and three submarginal cells ; the first small, 

 rounded, second long, receiving two recurrent nervures; lanceolate cell 

 contracted; under wings with two middle cells. 



Antcnvse. nine-articulate, moderate, joints gradually decreasing in 

 length and size from the third. 



Head nearly as wide as thorax ; mandibles slightly dentate. 



From late studies of Mr. Walsh, this is subject to as great varia- 

 tions, and is as difficult of iudentification at times, as species of the 

 genus Nematus. 



Mr. Walsh having bred many specimens from willow-galls, makes 

 the following divisions in the genus : 



1. GALL-MAKERS. 



1. E. orljitalis. 



Euurn orbitalis, Norton, Proc. Ent. Soc, Phil., I, 1862, 144, ? %. 

 Euura genuina, Walsh, Proc. Ent. Soc, Phil., VI, 1866, 250, 9 % . 

 Black; head and legs pale Inteous, a black spot on vertex. Length, 0.12 — 16. 

 Br. wings, 0..32. 



% $ . Shining black, polished. Antennae moderate, slightly flat- 

 tened, apical joints pale beneath ; head pale luteous ; a large black or 

 brownish spot enclosing ocelli, and a dusky spot on summit, nasus deeply 

 incurved; tegulae and most part of the anterior angle, sides of apical 

 segments, and in some cases, all the sides of venter, and the legs luteous, 

 the trochanters paler ; basal membrane visible, pale ; tips of hinder 

 tibiae and of their tarsi brownish ; wings hyaline, stigma pale at base. 



Var. a. % . A male from Labrador has the whole body beneath 

 pale. 



T a?', b. nigra. 9 . A female from Labrador has the whole head, 

 except the mouth, black; the coxae and femora, except at tip, black; 

 the trochanters white. 



Conn., N. Y., 111., ]jabrador. 



Mr. Walsh has named a species " genuina," which differs from the 

 above in having the flagellum of the male entirely bright rufous be- 

 neath. As he does not seem to have seen the above species, I have 



