454 AMERICAN HYMENOPTERA. 



black pile. Flagellum of antenna about three and one-half times as 

 long as the scape ; fifth antennal segment much longer than the 

 third, the third longer than the fourth. 



Thorax. — Dorsum entirely covered with yellow pile, or with a black 

 spot on the disc, or with a distinct, though rather poorly defined, black 

 band between the bases of the wings ; the very center of the disc 

 naked ; mesopleura yellow to, or nearly to, the bases of the legs ; meta- 

 pleura sometimes largely covered with yellow pile and sometimes with 

 very little ; sides of the median segment usually dark. 



Abdomen. — Dorsum : segment one yellow ; segment two yellow, but 

 often with a black spot on each side of the base, and rarely even only 

 the basal middle with yellow pile ; segment three entirely black {con- 

 tiguus Cress.), entirely yellow {citrinus F. Sm.), or with part black 

 and part yellow pile; segments four to seven inclusive black. Venter 

 dark. 



Genitalia. — Inner spatha very much like that of variabilis (fig 59), 

 but often with its hind margin curved forward considerably in the 

 middle so as to make the apex appear feebly bilobate. Outer spatha 

 considerably like that of ashtoni (fig. 60), but considerably broader for 

 its length and with more numerous hairs on its ventral surface. 

 Claspers (fig. 94) with their branches broadly rounded at the end as 

 viewed from dorsal side ; squamae broadly bilobate, the lobes being 

 about equal in size and more or less pointed ; the volsellse widest at the 

 middle and more or less pointed at their tips, the inner margin of each 

 nearly straight from its tip to about its middle and in front of its 

 middle rather suddenly incurved, the outer margin being gradually 

 outcurved. Sagittae much like those of variabilis (fig. 97). 



f^z«^5.— Much like those of the female. 



Legs. — Entirely dark ; the hind fringes of the hind metatarsi some- 

 times more or less ferruginous. 



Dimensions. — Length: female, 14 mm. to 18 mm. ; male, 11^ mm. 

 to \h\ mm. Spread of wings: female, 33 mm. to 40 mm. ; male, 28| 

 mm. to 36 mm. Width of abdomen at second segment : female, 7 

 mm. to 9 mm. ; male, 5 mm. to 1\ mm. 



Redescribed from many specimens of each sex. 



Habitat. — I have records of this species as follows : Canada 

 (Montreal, Ottawa, Prince Edward Island and Grand Manan 

 Island), Maine, New Hampshire, Vermont, Massachusetts, 

 Connecticut, New York, Pennsylvania, New Jersey, Delaware, 

 Maryland, Virginia, West Virginia, North Carolina (Blow- 

 ing Rock, Wilkesboro and Bushnell), Tennessee, Kentucky, 

 Ohio, Michigan, Indiana, Illinois, Wisconsin and Minnesota 

 (St. Paul and Lake Itasca). Swenk (Ent. News, July, 1907, 

 p. 297) reports the species from Lincoln and West Point, 



