No. 22.] HYMENOPTERA OF CONNECTICUT. IO7 



male differs in lacking the rufous and in having the femora in 

 great part black. Length 9 mm. Larva feeds on white oak. 



New Haven, 1907 (A. D. Reid), 21 May, 1910 (A. B. C.) ; 

 Lyme i May, 1910 (A. B. C). 



DlNEURIN^. 



Key to Genera. 



Front wings with transverse part of M2 interstitial with free 

 part of R5; free part of Sci situated before the medio-cubital 

 cross-vein Mesoneura p. 107 



Front wings with transverse part of M2 received in cell Rs 

 and never interstitial with free part of vein R5; free part 

 of Sci interstitial with or situated beyond the medio-cubital 

 cross-vein Dineura p. 107 



Mesoneura Hartig. 

 *M. parva (Norton). Dineura parva Norton. 

 Body black, with the tegulae and the apex of the venter pic- 

 eous; legs yellow-rufous; wings hyaline, the veins brown; an- 

 tennae filiform, third and fourth segments subequal; head without 

 depressions about ocelli; clypeus truncate. Length 4 mm. 

 Farmington (E. N.). 



Dineura Dahlbom. 

 Key to Species. 



1. Antennae with third segment longer than or subequal to 



fourth 2 



Antennas with third segment shorter than fourth; body black, 

 with legs beyond base of femora and apex of venter rufo- 

 testaceous; wings hyaline, iridescent, veins brown, costal 

 vein and stigma dull luteous. Length 5 mm luteipes 



2. Mesonotum more or less marked with rufous; body black, 



with prothorax, tegulae, side lobes of mesonotum, pleurae, 

 legs, and apex of abdomen, rufous; wings hyaline, stigma 



pale, cell R4 almost square. Length 5 mm linita 



Mesonotum wholly black; body black, with tegulae, collar, 

 large spot on pleurae, legs, apical half of tergum, and 

 apical two-thirds of venter, rufous; basal half of stigma 

 white; cell R4 longer than wide. Length 4.5 mm lateralis 



°P. luteipes Cresson. 

 °D. linita Norton. 

 °D. lateralis Norton. 



