No. 22.] HYMENOPTERA OF CONNECTICUT. 293 



°M. mellipes Provancher. 



Female and male : length 6-7 mm. ; legs mostly dark to pale 

 reddish. 



Holmgrenia Foerster. 



*H. tarsalis Cresson. 



Female : length 8 mm. ; mostly black ; dorsal abdominal seg- 

 ments with distinct, white, apical margins ; pleurae and sternum 

 reddish ; hind distal trochanters and a narrow annulus near the 

 base of hind tibiae, white ; hind coxae rufous ; hind femora black. 



Type locality: Branford, 3 September, 1904 (H. L. V.). 



Sphecophaga Westwood. 



Cacotropa (Foerster) Thomson. ^ 



°S. hurra Cresson. 



Female : length 7 mm. ; mostly reddish ; head, prothorax, 

 sternum, dorsum of thorax around bases of wings, and scutel, 

 mostly black or blackish ; anterior orbits, pronotum, tegulae, mar- 

 gin of prothorax and anterior margin of mesopleurae, white; 

 areolet absent ; ovipositor scarcely exserted. Male : differs in 

 having the thorax almost entirely blackish ; face, lower half of 

 cheeks, scape beneath, pedicel, sternum, fore and mid coxae and 

 trochanters, scutel, and the other parts noted in the description 

 of white portions in the female, white. 



Dialges Foerster. 

 Key to Species. 



Hind coxae black; scutel almost always black; hind tibiae 

 and tarsi black or blackish, with a yellow annulus; areolet 

 oblique; length 7 mm. (female and male); mostly black 



frontalis 



Hind coxae rufous; tibiae black with a yellow annulus; scutel 

 yellow; otherwise as in frontalis frontalis var. rivalis 



°D. frontalis Davis. 



°D. frontalis var. rivalis Davis. 



Tryphon Gravenhorst. 



No distinct transverse impressions before the apex on the 

 first and second dorsal abdominal segments. 



