No. 22.] HYMENOPTERA OF CONNECTICUT. 66y 



Lophocrabro, new subgenus. 



Type : Crabro singularis Smith. 



This name is proposed for the group which Ashmead con- 

 sidered as Crabro. Supraorbital fovese obsolete; pygidium of 

 the female narrowed apically and deeply channeled, with a fringe 

 of long, stiff, lateral hair; third antennal joint of the male much 

 more slender than the remaining joints; femora of the male 

 dentate beneath ; fore tarsi of the male flattened. 



Only one species of this group occurs in the territory treated. 



S. (L.) singularis Smith. 



This species was later considered to be the same as maculatus 

 Fabricius, but the evidence is not sufficient. First joint of the 

 flagellum longer than the two following united ; yellow markings 

 of the second abdominal segment pointed inwardly; yellow 

 marks of the fifth segment separated. 



Recorded from Connecticut by Fox. 



Subgenus Xestocrabro Ashmead. 

 Key to Species. 



1. Females 2 



Males 3 



2. Dorsal and posterior aspects of propodeum not separated by 



a series of foveae; posterior face striate above; mesoscutum 



closely punctate throughout sayi 



Dorsal and posterior aspects of propodeum separated by a 

 series of strong fovese; posterior face transversely rugose; 

 mesoscutum with punctures separated posteriorly . .trifasciatus 



3. First joint of flagellum distinctly longer than second; first 



and second joints of intermediate tarsi strongly produced 



within; anterior femora reddish beneath sayi 



First joint of flagellum subequal in length with second; first 

 and second joints of intermediate tarsi scarcely produced 

 within; anterior femora yellow beneath trifasciatus 



S. (X.) sayi Cockerell. S. sexmaculatus Say and Fox, not 

 Olivier. 



Occurs throughout the State throughout the summer and early 

 fall months, and is often found visiting flowers of Cicuta 

 maculata. Branford, Brookfield, Colebrook, New Canaan, 

 Sachem's Head, and Stonington. 

 °S. (X.) trifasciatus Say. 



