52 CONNECTICUT GEOL. AND NAT, HIST. SURVEY. [Bull. 



margin of clypeus, labrum, line on collar, tegulae, front 

 and middle legs below coxae, except infuscation on the 

 middle of femora, hind trochanters, tip of hind femora, 

 base of hind tibiae, and base of their tarsi, white. Length 



7-5 mm casta 



Ocellar basin rather broad, broader near the median fovea; 

 median fovea a broad crater, much wider than the ocellar 

 basin; clypeus with a low broad tooth at middle, lobes 

 broadly rounded; ocellar furrow indicated, interocellar fur- 

 row broad and distinct; the third segment of antennae dis- 

 tinctly longer than fourth; saw-guides convex above, 

 straight and converging to the roundly truncated apex; 

 body black, with clypeus, labrum, collar, tegulse, trochan- 

 ters, front legs below the middle of femora, middle and 

 hind legs beyond knees, apex of hind tibiae and hind 

 tarsi, more or less infuscated, white. Length 7 mm. 



celebrata 



15. Clypeus with a low, broadly rounded tooth at middle 16 



Clypeus with a small, acutely pointed tooth; ocellar basin 



broad with sloping sides, ending ventrally in a large me- 

 dian fovea with broadly sloping sides; ocellar and inter- 

 ocellar furrows distinct; third segment of antennae longer 

 than fourth; saw-guides convex above and below, broadly 

 convexly rounded at apex, extreme apex truncate for a 

 very short distance; body black, with clypeus, labrum, 

 collar, tegulae, and legs below knees, white. Length 6 mm. 



captiosa 



16. Supraclypeal area narrow and carinately elevated; clypeus 



angularly emarginate with broadly rounded lobes and with 

 a broadly rounded median tooth; median fovea an elongate 

 pit with flaring sides at the ventral end of ocellar basin; 

 ocellar furrow indicated, interocellar furrow distinct; third 

 segment of antennae distinctly longer than fourth; saw- 

 guides parallel above and below and truncately rounded 

 at apex; body black, with clypeus, labrum, tegulae, and collar 

 narrowly white; legs more or less infuscated. Length 



6 mm caeca 



Supraclypeal area rather broad and only convexly elevated; 

 clypeus deeply, narrowly, angularly emarginate to near 

 the middle of clypeus; lobes roundly pointed; clypeal tooth 

 small but distinct; ocellar and interocellar furrows 

 distinct; a depressed area in front of median ocel- 

 lus; third segment of antennae distinctly longer than 

 fourth; saw-guides with upper and lower margins parallel 

 and broadly truncately rounded at apex; body black, with 

 clypeus, labrum, collar, tegulae, front and middle legs be- 

 yond the apices of coxae, bases of their femora, more or 



