8o CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



°C. quercus-coccinea (Dyar). Monostegia quercus-coccinea 

 Dyar. Larva feeds on the leaves of the scarlet oak, Quercus 

 coccinea. 



*C. fasciata (Norton). Selandria fasciata Norton. Erio- 

 campa fasciata Norton. Larva feeds on oak. New Haven, 26 

 June, 1905 (H. L. V.). 



'^C. lata MacGillivray. 



Tenthredinin^e. 

 Key to Genera. 



1. Head broad between the eyes, broader at the antennae than 



the eyes are long; inner margins of the eyes subparallel. . . 2 

 Head narrow between the eyes, narrower at the antennae than 



the length of the eyes; eyes strongly convergent below. ... 8 



2. Antennal sockets with their mesal margins not dilated.... 3 

 Antennal sockets with their mesal margins distinctly dilated 4 



3. Anal veins anastomosed for a considerable distance, free 



part of 2d A wanting Pach5rprotasis p. 81 



Anal veins not anastomosed; free part of 2d A present. 



Lagium p. 81 



4. Basal plates divided at the middle by a longitudinal suture. . . 6 

 Basal plates not divided at the middle 5 



5. Malar space distinctly shorter than width of the posterior 



orbits; hind wings with either free part of R4 or M2 or both 



present Tenthredopsis p. 82 



Malar space subequal in length to width of posterior orbits; 

 hind wings with both the free part of Ri and M2 wanting. 



Neopus p. 82 



6. Clypeus truncate Bivena p. 82 



Clypeus distinctly emarginate 7 



7. Lateral ocelli above a line drawn between the posterior 



corners of the eyes; hind wings with free part of R^ and 



transverse part of M2 wanting Leucopelmonus p. 83 



Lateral ocelli below a line drawn between the posterior 

 corners of the eyes; hind wings with free part of R4 and 

 transverse part of M2 present Rhogogastera p. 83 



8. Antennal sockets with their mesal margins not dilated, or, 



if dilated, only slightly so and then not with the area 



between them deeply hollowed out 9 



Antennal sockets with their mesal margins strongly dilated 

 and with the area between them deeply hollowed out; an- 

 tennae never thickened toward apex Tenthredo p. 83 



9. Antennae with nine segments 10 



Antennae with eight segments Labidia p. 92 



