742 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



4. Black 5 



Metallic green, bluish or purplish Osmia p. 748 



5. Vein separating stigma from first submarginal cell longer 



than vein separating stigma from marginal cell; first dorsal 

 abdominal segment with a narrow sulcus . . Andronicus p. 750 

 Vein separating stigma from first submarginal cell not longer 

 than vein separating stigma from marginal cell; first dorsal 

 abdominal segment subtruncate, with a punctate cavity- 

 bounded by a distinct rim Heriades p. 751 



Males, 



1. Abdomen not maculated 2 



Abdomen maculated; maculations yellow or reddish; apical 



tarsal joint and maxillary palpus as in female 



Dianthidium p. 752 



2. Apical tarsal joint without an empodium 3 



Apical tarsal joint with an empodium 4 



3. Axillae not produced into spines on each side of scutel 



Megachile p. 742 



Axillae produced into spines on each side of scutel 



Ccelioxys p. 746 



4. Black S 



Metallic green, bluish or purplish Osmia p. 748 



5. Vein separating stigma from first submarginal cell longer 



than vein separating stigma from marginal cell; first dorsal 



abdominal segment as in female Andronicus p. 750 



Vein separating stigma from first submarginal cell not longer 

 than vein separating stigma from marginal cell; first dorsal 

 abdominal segment as in female Heriades p. 751 



Megachile Latreille. 

 Leaf-cutter bees that make tubular cells out of nearly semi- 

 circular pieces of leaves which they cut from various plants. 



Key to Species. 



Females. 

 Mandibles expanded at apex. 



1. Abdomen viewed from above, oblong; third joint of maxillary 



palpi shorter than first and second; second to fourth 

 dorsal abdominal segments without pubescent fasciae in 



basal grooves 2 



Abdomen viewed from above, cordate with an acute basal 

 tooth ". 3 



2. Cheeks with a large tooth beneath; clypeus with a median 



teeth pugnata 



