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



°M. (M.) generosa Cresson. 



M. (M.) brevis Say. Howard, Insect Book, PI. iii, Fig. 5. 



Occurs all over the State, from June to September. Has been 

 taken at Branford, New Canaan, New Haven, North Haven, 

 Poquonock, Rockville, Sachem's Head, Salisbury, Scotland, and 

 Stafford, on sunflower, goldenrod, and milkweed flowers. 



Coelioxys Latreille. 

 This genus of bees is parasitic upon species of the preceding 

 genus. 



Key to Species. 



Females. 



1. Clypeus convex 2 



Clypeus bilobed; sixth abdominal segment rather abruptly 

 narrowed sayi 



2. First dorsal abdominal segment with apical fasciae, edge 



of its concavity hardly carinate; scutel rounded or with a 

 blunt tubercle; second to fourth dorsal abdominal seg- 

 ments without oblique basal fasciae 3 



First dorsal abdominal segment with apical fasciae, edge of 

 its concavity carinate 6 



3. Sixth dorsal abdominal segment slightly sinuate laterally.. 4 

 Sixth dorsal abdominal segment strongly, abruptly narrowed; 



legs black; tarsi red dubitata 



4. Legs black , 5 



Legs red octodentata 



5. Dorsulum dull mcesta 



Dorsulum shining lucrosa 



6. Sixth dorsal abdominal segment curved downward and drawn 



out into a rounded spine 7 



Sixth dorsal abdominal segment with a straight terminal 

 spine; corresponding ventral segment broadly rounded, 

 mucronate, brownish ciliate lucrosa 



7. Sixth ventral abdominal segment curved at right angles to its 



basal half, mucronate, yellowish ciliate mcesta 



Sixth ventral abdominal segment arched, mucronate, yellow- 

 ish ciliate dubitata 



Males. 

 I. Cheeks with posterior inferior angle beveled or grooved; 

 second and third dorsal abdominal segments without basal 

 fasciae; fifth segment with lateral apical spines; sixth with 

 two lateral and four terminal spines, median sulcus about 

 one-third the width of the segment; scutel rounded or 



