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



Subgenus Protothyreopus Ashmead. 

 Key to Species. 



Mesoscutum very coarsely sculptured; head and thorax of 

 female coarsely sculptured; first joint of intermediate tarsi 

 of male normal, slightly longer than two following united 



rufifemur 



Mesoscutum not coarsely sculptured; head and thorax of 

 female finely sculptured; first joint of intermediate tarsi of 

 male strongly angular on outer margin and slightly shorter 

 than following two joints united bigeminus 



S. (P.) rufifemur Packard. 



Sachem's Head, i August, 1904; New Haven, 4 July, 1905 

 (H, L. v.), on New Jersey Tea. 



S. (P.) bigeminus Packard. 



New Haven, 26 June, 1902 (E.J.S.M.). 



■ Subgenus Hypocrabro Ashmead. 

 As treated here this subgeneric name is used to include also 

 Pseudocrabro and Xyiocrabro as defined by Ashmead. 



Key to Species. 



1. Females 2 



Males 4 



2. Pygidium without a distinct lateral fringe of stiff hairs; ab- 



domen never banded but with lateral spots stirpicola 



Pygidium with a distinct fringe of stiff hairs 3 



3. Mesoscutum with strong punctures which are separated on 



posterior portion decemmaculatus 



Mesoscutum closely and finely punctate throughout. . chrysargynus 



4. Flagellum entire beneath decemmaculatus 



Flagellum emarginate beneath 5 



5. Dorsal aspect of propodeum with strong foveae laterally . . 



. stirpicola 

 Dorsal aspect of propodeum without strong foveae laterally 



chrysargynus 



S. (H.) stirpicola Packard. 



This species makes cells within the stems of plants which 

 have a large pith, and provisions these cells with various species 

 of flies. 



New Haven, 28 July, 1898, taken as it was boring into a 

 cane of Japanese wineberry (W. E. B.). 



