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 i 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 serrutata occurring on alder {Alnus 

 serrulata) . 



Polygnotus Foerster. 

 Key to Species. 



Females, 



1. 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 S 



Coxae rufo-piceous or pale viticola 



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



long 6 



