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 Xylocrabro 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 foveas 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.). 



