No. 22.'] HYMENOPTERA OF CONNECTICUT. I4I 



P. desmodioides Walsh. Nematus desmodioides Walsh. 

 Larva makes galls on Salix humilis. New Canaan, ly Septem- 

 ber, 1915 (B. H. W.). 



Euura Newman. 

 Key to Species. 



1. Frontal crest distinct 2 



Frontal crest indefinite and apparently wanting; body black, 

 with the head except a quadrangular spot about the ocelli and 

 extending to the eyes, prothorax, margins of lobes of meso- 

 notum narrowly, upper half of pleurae, tegulse, legs, abdo- 

 men except above at base, and saw-guides except at apex, 

 resinous; median fovea a minute elongate pit; saw-guides 

 large, upper and lower margins slightly converging, and 

 broadly rounded at apex. Length 7 mm maculata 



2. Frontal crest unbroken at middle 3 



Frontal crest notched or broken at middle 5 



3. Orbits rufous 4 



Orbits wholly black; body black, with antennas, except at 



base, rufous; tegul^ and legs beyond basal third of femora, 

 yellowish rufous; median fovea distinct, round, pit-like; 

 clypeus deeply, narrowly, angularly emarginate; saw- 

 guides narrow and converging on both margins to a 

 bluntly rounded apex. Length 6 mm salicicola 



4. Median fovea circular, shallow; body black, with head ex- 



cept a round patch about ocelli, prothorax, legs, venter, 

 and apex of abdomen more or less, rufous; clypeus shal- 

 lowly, roundly emarginate; saw-guides straight above, and 

 broadly convexly rounded to a blunt point at apex above. 



Length 7 mm orbitalis 



Median fovea deep, pit-like, longer than broad; body in female 

 black, with head except a square spot about ocelli and occiput, 

 prothorax, tegulae, legs, and abdomen except some of the basal 

 dorsal abdominal segments, rufous; clypeus broadly, deeply 

 rounded; saw-guides with two margins converging toward 

 apex, the lower margin strongly oblique, bluntly pointed . 

 at apex; apex of saw-guides covered with a dense scopa; 

 male differs in having more black on head and abdomen. 

 Length 7 mm ovum 



5. Orbits, at least in part, pale 6 



Orbits wholly black; body black, with legs beyond middle 



of femora, rufous; median fovea shallow, broad, indefinite; 

 frontal crest broken by a very narrow furrow; saw-guides 

 with the two margins gradually converging to a bluntly 

 rounded point at apex. Length 6 mm nigra 



6. Median fovea indefinite, represented only by a shallow de- 



pression in frontal crest; body black, with head except 



