No. 22.] HYMENOPTERA OF CONNECTICUT. 27 



Interocellar Furrow. The interocellar furrow is a short de- 

 pressed line or space extending from the middle of the ocellar 

 furrow to the median ocellus. Adjacent to the median ocellus, 

 this furrow flares out, and is frequently a depressed area sur- 

 rounding the ocellus. 



Post ocellar Area. The postocellar area is the region on the 

 dorsal aspect of the head bounded by the ocellar furrow, the 

 vertical furrows, and the caudal margin of the head. 



Frontal Crest. The frontal crest is an elevation extending 

 across the head just above the antennal sockets. It separates 

 the region between the antennae from the region above it. The 

 frontal crest is usually limited on each side by the antennal fur- 

 rows, but it may extend across the antennal furrows nearly to 

 the margin of the compound eyes. It is frequently interrupted at 

 middle by the median fovea, when it is said to be broken. 



Antennal Groove. The antennal groove is the curved portion 

 of the antennal furrow extending on each side of the head be- 

 tween the tentorial fovea and the frontal crest around the lateral 

 margin of the antennal sockets. 



Supraclypeal Area. The supraclypeal area is the region be- 

 tween the antennal sockets, the clypeus, and the frontal crest. 

 It may be flat, uniformly convex, carinated, or concave. 



Median Fovea. The median fovea is a rounded or angular 

 pit located near the middle of the ventral margin of the frontal 

 crest. The median fovea is figured and described by some au- 

 thors as the antennal fovea. 



Antennal Fovece. The antennal fovea? are the depressed 

 areas surrounding the antennal sockets. The antennal furrows 

 and the lateral foveae are frequently connected with the antennal 

 foveae. 



Frontal Area. The frontal area comprises the region of the 

 head located between the antennal furrows, the frontal crest, 

 and the ocellar furrow. 



Ocellar Basin. The depressed area surrounding the median 

 ocellus is frequently continued as a concave area to the frontal 

 crest. The interocellar furrow is frequently expanded so as to 

 occupy most of the space between the lateral ocelli. This con- 

 cave area, occupying the median portion of the frontal area, 



