SOLITARY WASPS. 



longer than the first and pointed at the tip. Our only 

 species, ocellatus, nests in sand banks and provisions with 

 bugs of the genus Lygns. Our other genus is Crabro 

 (Plate XCII), which is much split up in the recent classifica- 

 tions, but some of the distinctions are rather technical. 

 Different groups of species have different habits; nesting 

 in wood, stems, and soil; provisioning with mites, spiders, 

 flies, bugs, aphids, and moths. 



* 



PHILANTHID/E 



In the Hymenoptera of Connecticut they have widely 

 separated Cerceris from Pliilanthus because the latter has 

 a suture on the sides of the thorax, below the front wings, 

 which the former lacks. For our purpose the four genera 

 accepted years ago seem sufficient. 



1. Third submarginal cell very large, somewhat quadrate, 

 scarcely narrowed towards the marginal cell and extending 

 beyond it ; first abdominal segment narrowed. Eucerceris. 

 For the most part, western. 



Third submarginal cell much narrowed towards 

 the marginal, leaving a broad deep sinus between them, 

 the former not extending beyond the latter 2. 



2. Basal segment of abdomen narrower than the second, 

 all the segments more or less constricted; second sub- 

 marginal cell petiolate ; marginal cell rather obtuse at apex 

 and rarely extending beyond the third submarginal cell. 



Cerceris (Plate XCII). 



Basal segment of abdomen nearly or quite as broad 

 at apex as the base of second segment, segments rarely 

 constricted; second submarginal cell not petiolate; mar- 

 ginal cell usually narrowed, pointed at apex, and extending 

 beyond the third submarginal cell 3. 



3. Inner margins of eyes indented; antennae arising 

 from the middle of the face not far above the clypeus, 

 not near each other; apex of marginal cell touching the 

 front margin Pliilanthus. 



Margins of eyes not indented; antennas arising from 

 above the middle of the face, near each other or the clypeus ; 



apex of marginal cell not touching the front margin 



Aphilanthops. 



435 



