No. 22.] HYMENOPTERA OF CONNECTICUT. 699 



Basal vein forming a more or less perfectly straight line; 

 face with pubescent depressions or foveae, at least in 

 female .ANDRENID^ p. 709 



7. First portion of subdiscoidal vein distinctly longer than third 



portion of discoidal vein 8 



First portion of subdiscoidal vein shorter than third portion 

 of discoidal vein NOMADID^ p. 722 



8. Marginal cell bent away from costal vein 9 



Marginal cell not bent away from costal vein 



ANTHOPHORID^ p. 735 



9. Vertex crested EUCERID^ p. 730 



Vertex not crested EMPHORID^ p. 734 



10. Second recurrent vein bent or directed outward before join- 



ing first portion of subdiscoidal vein; tongue flat, bilobed; 



depressions or foveae on face 11 



Second recurrent vein never strongly bent or directed out- 

 ward before joining first portion of subdiscoidal vein; 

 tongue filiform; no depressions or fovese on face 12 



11. Wings with two closed submarginal cells; black with yellow 



markings HYL^ID^ p. 737 



Wings with three closed submarginal cells; black without 

 yellow markings COLLETIDvE p. 739 



12. Wings with two submarginal cells 13 



Wings with three submarginal cells 14 



13. Claws cleft, inner tooth subapical STELIDIDyE p. 741 



Claws simple, or in some species with a basal tooth 



MEGACHILID^E p. 741 



14. Apex of sixth dorsal abdominal segment in female with a 



spine •. . . . 15 



Apex of sixth dorsal abdominal segment in female without 

 a spine; first submarginal cell shorter than second; cheek 

 or malar space distinct APID^ p. 754 



15. First submarginal cell longer than second, and as long as 



third CERATINIDiE p. 753 



First submarginal cell shorter than second 



XYLOCOPID^ p. 753 



HALICTID^. 

 To this division of bees belong what are known as sweat-bees. 

 They range in color from stramineous to black, and some have 

 metallic blue, green, brassy, or coppery hues ; others have more or 

 less red or yellow in the ground color or markings. In size each 

 species is quite constant within certain limits. The largest species 

 is hardly more than 12 mm. in length, and the smallest scarcely 

 less than 5 mm. 



