138 U. S. NATIONAL MUSEUM BULLETIN 216 



second tergite about 1.15 as long as wide; third tergite polished, its 

 tubercles prominent and with moderately small punctures whose inter- 

 spaces are about 2.5 their diameter, the punctures surrounding the 

 tubercles coarser and much denser; ovipositor sheath about 1.45 as 

 long as front wing; ovipositor tip as in D. messor (fig. 330,f). 



Black. Clypeus stained with ferruginous; palpi dark brown; tegula 

 white; coxae black or blackish; front and middle trochanters whitish; 

 hind first trochanter blackish brown, fulvous apically; hind second 

 trochanter fulvous, yellowish in front; femora fulvous, the front and 

 middle femora pale yellow at apex and partly in front; tibiae light 

 fulvous, the front tibia yellowish above and the hind tibia a little paler 

 basally; tarsi yellowish fulvous, the hind tarsus a little darker; second 

 and following tergites red, the second to fifth tergites with progres- 

 sively smaller lateroapical transverse black spots. 



The black hind coxa immediately distinguishes this species from 

 others in the Nearctic region. The abdomen is mostly red except in 

 some smaller males. In the other Nearctic species the abdomen is 

 always black. 



Specimens (200 cf, 5919): From Alabama (Littleville in Colbert 

 Co. and Mobile) ; Connecticut (Colebrook, East Haddam, Hartford, 

 Lyme, Redding, Voluntown, and Westport); District of Columbia 

 (Washington); Florida (Bratt in Escambia Co. and Valpariso); 

 Georgia (Austell); Illinois (Algonquin, Champaign, Chicago, and 

 Urbana) ; Indiana (Gibson Co. and Lafayette) ; Iowa (Henry Co.) ; 

 Kansas (Baldwin, Cherokee Co., Lawrence, Leavenworth, Mont- 

 gomery Co., and Osage Co.); Kentucky; Maine (Lincoln Co.); Mary- 

 land (Beltsville, Bethesda, Bowie, Cabin John, "Club Hill," College 

 Park, Crownsville, Glen Echo, Great Falls, Hagerstown, Hyattsville, 

 Maryland shore near Plummers Island, and Takoma Park); Massa- 

 chusetts (Springfield, Taunton, and Waltham); Michigan (Ann 

 Arbor, Antrim Co., Chatham, Clare Co., Coloma, Detroit, East 

 Lansing, George Reserve in Livingston Co., Gratiot Co., Grosse He 

 near Detroit, Gull Lake Biological Station in Kalamazoo Co., Ionia 

 Co., Iosco Township in Livingston Co., Kalkaska Co., Keweenaw Co., 

 Lake City, Lenawee Co., Mecosta Co., Midland Co., Oakland Co., 

 Roscommon Co., Saginaw, Sanilac Co., Shiawassee Co., Warren 

 Woods in Berrien Co., and Whitefish Point in Chippewa Co.) ; Min- 

 nesota (Brownsville, Cotton, Eitzen, Lamoille, Nerstrand Woods in 

 Rice Co., Olmsted Co., St. Anthony Park in Ramsey Co., and St. 

 Paul); Mississippi (Oxford); Missouri (Azalea Mts. near Van Buren, 

 and Boonville); New Jersey (Alpine, Camden, Clementon, Elwood, 

 Englewood, Moorestown, Ridgewood, Riverton, "Sea Cliff," Seaside 

 Park, and Tabernacle); New York (Bemus Point, Colden, Dix Hills 



