No. 22.] HYMENOPTERA OF CONNECTICUT. 147 



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, tegulae, 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 obtusi- 

 loba. 



P. emarginata MacGillivray. Mogerus emarginatus MacGil- 

 livray. Larva feeds on Quercus coccinea. 



P. media (Norton). Selandria media Norton. Monophadnus 

 media Norton. Larva feeds on Quercus alba. 



P. chionanthi Dyar. Larva feeds on Chionanthus. 



P. subtruncata Dyar. Larva feeds on Quercus coccinea. 



