320 



U. S. NATIONAL MUSEUM BULLETIN 216 



PART 3 



front tibia fulvous; middle tibia fulvous, or fuscous with the base and 

 apex fulvous; hind tibia varying from fulvous to black; tarsi brown 

 to fuscous, paler at the joints; wings weakly infuscate; tergites 2-4 

 and more or less of apex of tergite 1 ferruginous; tergite 5 varying 

 from ferruginous to fuscous. 



Specimens from California have the dark markings unusually in- 

 tense but do not seem to be separable as a subspecies. 



Specimens (54 c^, 249): From California (Davis, Gait, Hallelujah 

 Junction in Lassen Co., Old Station, Pine Crest, 4 miles west of 

 Quincy, Sardine Creek in Mono Co. at 8,500 ft., and Strawberry in 

 Tuolumne Co.) ; Colorado (Boulder, Peaceful Valley, Poudre Canyon in 

 Larimer Co. at 5,200 ft., and Valmont); District of Columbia (Wash- 

 ington); Iowa (Cedar Co. and Jackson Co.); Labrador (Cartwright) ; 

 Maine (summit of Mount Katahdin at 5,215 ft.) ; Maryland (Patuxent 

 Refuge near Bowie and Takoma Park); Massachusetts (Ipswich); 

 Michigan (Ann Arbor, Benzie Co., Cheboygan Co., Gladwin Co., 

 Huron Mts., Keweenaw Co., Luce Co., Missaukee Co., and Muskegon 

 Co.); New Hampshire (Franconia, Glen House, and Gorham); New 

 Jersey (Hornerstown) ; New York (Canadarago Lake, Geneva, Ithaca, 

 McLean Bogs in Cortland Co., Michigan Hollow Swamp in Tompkins 

 Co., and Poughkeepsie) ; Ohio (Logan Co. and Put-in-Bay); Ontario 

 (Blackburn and Ottawa); Oregon (Anthony Lake); Pennsylvania 

 (Highspire, Pittsburgh, and Spring Brook); Quebec (Cascapedia) ; 

 Virginia (Falls Church, Fredericksburg, and Rosslyn) ; and Wisconsin 

 (Stanley and Worden Twp. in Clark Co.). 



Most collection dates are between May 30 and August 3. Those 

 outside of this range are: April 12 at Davis, Calif.; April 22 at Quincy, 

 Calif.; April 28 at Valmont, Colo.; May 20 at Sprmg Brook, Pa.; 

 May 23 at Ithaca, N.Y.; May 24 in Gladwin Co., Mich.; August 15 



Figures 174, 175.— Localities: 174 (left), Hidryta frater; 175 (right), H. nigricoxus. 



