I20 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



°P. dimmockii (Cresson). Nematus dimmockii Cresson. 



°P. ocreatus (Harrington). Nematus ocreatus Harrington. 

 P. extensicornis (Norton). Nematus extensicornis Norton. 

 Nematus marylandicus Norton. Nematus aureopectus Norton. 

 Howard, Insect Book, p. 75, Fig. 46, PI. xiv, Fig. 29. Larva 

 feeds on wheat. New Haven, 15 May, 191 1, Orange, 21 May, 

 1911 (A. B. C). 



P. affinis Marlatt. Larva feeds on grass. Stonington, 16 

 May, 1906 (B. H. W.). 



*P. rufocinctus MacGillivray. New Haven, 15 May, 1911, 

 Orange, 21 May, 191 1 (A. B. C). 



°P. suadus (Cresson). Nematus suadus Cresson. 



°P. pubescens Marlatt. Larva feeds on Carex. 



°P. monti vagus Marlatt. ^ 



°P. punctulatus Marlatt. 



°P. corticosus MacGillivray. 



°P. gregarius Marlatt. Larva feeds on willow. 



*P. corniger (Norton). Nematus corniger Norton. Larva 

 feeds on grass. Connecticut (E. N.) ; Branford, 8 May, 1905 

 (H. W. W.). 



P. subalbatus (Norton). Nematus subalbatus Norton. 

 Orange, 21 May, 191 1 (A. B. C.) ; New Haven, 30 May, 1911 

 (B. H. W.). 



°P. palliventris (Cresson). Nematus palliventris Cresson. 



°P. tritici IMarlatt. Larva feeds on wheat. 



°P. infumatus Marlatt. 



Nematus Jurine. 



Key to Species. 



I. Abdomen with last dorsal arc enormously developed; clypeus 

 deeply, rather narrowly notched, lobes large and rounded; 

 ocellar basin scarcely defined, deep furrow connecting an- 

 terior ocellus with median fovea; saw-guides tapering, 

 pointed, and with the terminal abdominal segment enor- 

 mously developed, representing nearly half of abdomen; 



body uniformly reddish yellow. Length 7 mm unicolor 



Abdomen with last dorsal arc not enormously developed 2 



