AMERICAN HYMENOPTERA. 843 



iial cells, the second and third each with a recurrent uervure. An- 

 tf'nnse. about 21-jointed, toward the apex sub-clavate. Anterior tihise, 

 with one apical spur; middle tibiae with one, hinder tibiae with two 

 side spurs ; the tarsi have little membraneous plates beneath. The 

 abdomen is more or less compressed, somewhat as in Opltlon. 



The lai-va is fleshy, with a scaly head and six minute thoracic legs ; 

 the apical segment is attenuated and terminated by two minute points, 

 with a conical lobe on each side. 



Their habits are not much known ; Mr. Westwood notes one species 

 which deposits its eggs in the young stems of the pear, spirally, the 

 larva feeding within the shoots; another species j-esides in the stems of 

 wheat and occasionally commits much injury. Curtis refers to a species 

 ( C. ahdom.inalis) which lives upon the flowering buds of fruit trees. 

 But few species, which are rare, are as yet known in this country. 



1 . C. abbreviatus. 



Cephus abbreviatus, Say, Long's. 2nd Exp. ii. 1824, 314, 2, 9- 

 Black, abdomen rufous, at base. Length 0.28 inch. 



9 . — " Body black, polished ; labrum white, with a dilated, bngitu- 

 diual, fuscous line; thorax with an oblique, white, abbreviated line at 

 the base of the superior wings; scutel with a transverse, white line-; 

 mesothorax with a longitudinal white spot ; wings hyaline, nervures 

 fuscous; the small nervure which divides the first submarglnal cellule 

 is abbreviated and does not reach the margin; feet pale rufous; tibias 

 with a white abbreviated line on the exterior side near the knees ; 

 posterior tibia? and tarsia black ; abdomen compressed, acutely edged 

 above, beyond the middle ; first and second segments rufous." 



" Pennsylvania." 



Not seen. Mr. Walsh writes me that the antennae of Cephus abbre- 

 viatus are 29-jointed, the last joints subequal. Probably a Phj/lloecus. 



2. C. heteropterus. 



Cephus heteropterus, Harris, Catalogue. Norton, Bost. Proc. viii, 1861, 224, 1 , 9 . 

 Length, 0.30. Br. wings 0.60 inch. 



% . — Resembles C abbreviatus^ except that the basal segments of 

 the abdomen are obscure ferruginous above, and rufous beneath. There 

 are two pale dots on the mesothorax and all the legs are pale honey 

 yellow, posterior tarsi blackish. The small marginal areolet of upper 

 wing is either wanting or incomplete. 



Massachusetts, New Hampshire, (Harris' Coll.). 

 This is probably the male of C. abbreviatus. 



