No. 22.] HYMENOPTERA OF CONNECTICUT. I47 



legs, upper half of pleurae, mesonotum except black spot 

 at middle, metanotum, scutellum, and abdomen, fulvous; 

 mesonotum and mesopleurae tending to rufous; wings hya- 

 line. Length 7 mm marginicollis 



Ocellar basin flat and distinct; ocellar furrow wanting; saw- 

 guides with their upper margins slightly concave above, and 

 with the lower margins convex, and drawn out to a sharp point 

 above at apex; body black, with clypeus, labrum, collar 

 broadly, tegulse, legs beyond coxae, and abdomen at sides 

 above and for the most part beneath, luteous shading to 

 brownish; median lobe of mesonotum for the most part, 

 and pleurae, brown ; wings hyaline. Length 5 mm confusa 



4. Clypeus, if emarginate, not angularly emarginate 5 



Clypeus angularly emarginate; body black, with labrum, col- 

 lar narrowly, tegulae, legs, and tergum of abdomen for 

 the most part, white, more or less suffused with rufous 

 and fuscous ; wings hyaline. Length 7 mm .emarginata 



5. Legs with femora more or less black 6 



Legs wholly pale beyond coxae; body black, with collar 



narrowly, tegulae, and legs beyond knees, luteous; femora 

 rufous; ocellar basin distinct; postocellar area twice as 

 broad as long; wings hyaline. Length 6 mm media 



6. Interocellar furrow not extending onto postocellar area; body 



black, with collar narrowly, and tegulae, white; knees and tibiae 



luteous; tarsi fuscous; wings hyaline. Length 5.5 mm.^ 



chionanthi 

 Interocellar furrow extending onto postocellar area; body 

 black, with collar narrowly, and tegulae, white; legs beyond 

 middle of femora, brown; tarsi more or less dusky; wings 

 hyaline. Length 5.5 mm. subtruncata 



°P. purpuridorsum Dyar. Howard, Insect Book, PI. xiv, 

 Fig. 10. Larva feeds on Quercus alba. 



°P. marginicollis (Norton). Selandria marginicollis Norton. 

 Monophadnus marginicollis Norton. 



°P. confusa MacGillivray. Larva feeds on Quercus ohtusi- 

 loha. 



°P. emarginata MacGillivray. Mogerus emarginatus MacGil- 

 livray. Larva feeds on Quercus coccinea. 



° P. media (Norton). Selandria media IS^orton, Monophadnus 

 media Norton. Larva feeds on Quercus alba, 



°P. chionanthi Dyar. Larva feeds on Chionanthus, 



°P. subtruncata Dyar. Larva feeds on Quercus coccinea. 



