20 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



Head narrower than pronotum but only slightly so in some speci- 

 mens; vertex usually as long next to eye as mediaUy but occasionally 

 longer medially, interocular width more than three times median 

 length; ocellus located at a distance of from one to two times its 

 diameter from eye; anteclypeus parallel margined or slightly wider 

 apically, not exceeding gena; postclypeal sutures parallel above anten- 

 nal pits; pronotum approximately three times as long as vertex; 

 hind femoral chaetotaxy 2-2-1; female with posterior margin of 

 abdominal sternum VII truncate or slightly concave posteriorly. 



Male pygofer with less than 15 setae, ventral margin produced, 

 posteroventral border more heavily sclerotized, a heavily sclerotized 

 band extending vertically through setal area; plates slender, triangular, 

 not extending as far posteriorly as pygofer apex; connective expanded 

 and truncate apically, two-thirds length of style, stem sHghtly longer 

 than arms, arms thickened, with angle between arms acute; style 

 with preapical lobe rounded, apical extension curved laterally and 

 rounded; aedeagus -with dorsal apodeme conspicuous, shaft evenly 

 curved dorsaUy, slightly expanded apically, bifid apicaUy in postero- 

 ventral view; processes on shaft inconspicuous if present. 



Color stramineous to green; face with or without faint obhque 

 brown lines on each side of midline; thoracic venter not dark; fore- 

 wings hyaline to subhyaline, commonly tinted as body color. 



The male lectotype (selected by P. W. Oman) from Jamesburg, N. J., 

 is deposited in the collection at Iowa State University and has been 

 examined. The male holotype of B. hyalina Osborn, from Cuba, is 

 located at the U.S. National Museum and has also been examined. 

 This is a widespread and variable species. Additional specimens have 

 been examined from the states of Alabama, Arizona, Connecticut, 

 District of Columbia, Florida, Georgia, Iowa, Kansas, Maryland, 

 Michigan, Mississippi, Missom-i, New Hampshire, New York, North 

 Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Texas, Virginia, 

 West Virginia, Wisconsin, and Ontario. Other specimens examined 

 were from Mexico, Puerto Rico, Cuba, Trinidad Island, British 

 Honduras, Guatemala, Costa Rica, and Peru. This species has been 

 collected from sedge in Cuba. 



B. a. abdominalis (Van Duzee) appears to be closely related to 

 several other species. It can be distinguished best by the shape of 

 the aedeagus of which the shaft is evenly curved, expanded apicaUy 

 and on which, if lateral projections are present, they are inconspicuous. 



