292 ENTOMOLOGICAL NEWS. [July, '15 



three abdominal segments, rather scanty on the rest of the thorax and 

 head. 



Hob. Milwaukee, Wisconsin, one (=type) May 29, 1903, 

 and one (cotype) April 27, 1905 (S. Graenicher). Forest 

 Hills, Massachusetts, May n, 1912 (W . M. Wheeler). Also 

 from Garrison, New York (Eleth Cattell} and Niagara, New 

 York, June, 1904 (Cockerell). 



The specimens from Massachusetts were a little larger and 

 more robust, and had the stigma and nervures a little darker 

 than those from Wisconsin. 



The males of this species and of H. connexus Cresson from 

 Texas were examined and compared ; each resembles the 

 female of the respective species except for such differences as 

 are due to sex. The males of the two species differ from one 

 another in the same characters as the females. 



Halictus subconnexus rohweri n. subsp. 



Two specimens from Newington, Fairfax Co., Virginia, 

 May 30, 1911 (S. A. Rohwer}, appear to represent a distinct 

 subspecies. They differ from the typical form mainly as 

 follows : punctures on the disc of the mesonotum a little closer, 

 although quite as fine as in the type ; along the lateral and 

 posterior margins of the mesonotum the punctures are closely 

 crowded, and this is especially apparent at the posterior lateral 

 angle, hindermost end of the parapsidal groove ; wings dis- 

 tinctly brownish although translucent, stigma and nervures 

 very dark testaceous ; truncation of the metathorax sharper 

 and broader with a low sharp lateral rim extending almost to 

 the dorsal margin. 



The group of species to which H. connexus Cresson and 

 H. subconnexus Ellis belong is characterized by the sculpture 

 of the metathorax and the large size of most of its species. 

 The plicae on the basal area of the metathorax are usually 

 very strong. The basal area of the metathorax has a short, 

 sharp rim which truncates its middle plicae but not the more 

 lateral ones, and the truncation of the metathorax is more or 

 less completely bounded by a low sharp rim. In the following 

 key to this group the species are arranged in a series according 

 to the coarseness of the punctures on the mesonotum. 



