NO. 22.] HYMENOPTERA OF CONNECTICUT. 535 



3. First flagellar joint longer than thick, legs piceous, varied 



with lighter picipes 



First flagellar joint not longer than thick, legs brownish 

 yellow pallipes 



P. pallipes Ashmead. 



Black ; finely granulately sculptured ; subopaque. Female an- 

 tennae piceous; scape, pedicel, and three or four following joints 

 yellow; in male entirely pale brown. Abdomen a little longer 

 than the head and thorax together. Length 2-2.6 mm. 



P. picipes Ashmead. ^ 



Black, shining. Legs rufo-piceous or almost black, with the 

 trochanters, tips of femora, and the tarsi paler. Antennae brown- 

 black. Scutellum very convex, subopaque, without any tubercle 

 at tip. Length 1.8-2 mm. 

 P. auripes Ashmead. 



Black, shining, the head opaque, and closely microscopically 

 punctulate. Antennae and legs bright golden yellow. Thorax 

 without furrows or with only traces posteriorly. Scutellum ter- 

 minated by an awl-shaped spine. Length 1 mm. 



P. alnicola Ashmead. 



Black, shining, the head and dorsum of the thorax 

 microscopically punctate. Antennae black, the tip of the pedicel 

 honey-yellow. Mesonotal furrows complete. Scutellum highly 

 convex, subopaque, the tubercle at tip subobsolete. Length 1.4- 

 1.8 mm. 



A parasite of Cecidomyia serrulata occurring on alder (Alnus 

 serrulata) . 



Polygnotus Foerster. 

 Key to Species. 



Females, 



i. Mesonotal furrows distinctly indicated posteriorly 2 



Mesonotal furrows entirely absent, or present only as the 



slightest trace posteriorly 12 



2. Occiput strongly transversely striated or aciculated 3 



Occiput smooth or nearly so 7 



3. Vertex simple, not impressed at middle 4 



Vertex impressed at middle, subangulated just over eyes 



striaticeps 



4. Coxae black 5 



Coxse rufo-piceous or pale viticola 



5. Head very wide, three and one-half or four times as wide as 



long 6 



