56 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 68 



equal to one-eighth eye height, front projects shghtly more than one- 

 third eye width; palpi black, of normal size. Thorax gray pollinose 

 tinged with brown on notum, with four broad black vittae, the out- 

 side pair of which extend to scutellum, inner pair not extending beyond 

 transverse suture. Abdomen black, somewhat flattened dorsoven- 

 trally; intermediate segments pollinose to apices, pollen strongly 

 tessellated, changing abruptly from bronze to gray when rotated in 

 the light, last segment pollinose on basal two-thirds; first segment 

 without macrochaetae, second with a strong median marginal pair, 

 third with a strong median marginal pair and several distinctly 

 weaker ones on either side, in some specimens forming an uninter- 

 rupted marginal row, fourth with marginal row of bristles which 

 increase gradually in size towards the median dorsal line. Wings 

 subh3^aline; hind cross vein straight and nearly perpendicular to 

 fourth vein, which it joins almost halfway between its bend and the 

 small cross vein; Third vein bristly nearly to small cross vein. Tarsus 

 of fore leg slender, without conspicuous long bristly hairs on the 

 outside; middle tibia with one small bristle on outer front side beyond 

 middle but lacking an encircling whorl of three at this place; hind 

 tibia on outside with a row of about nine unequal bristles extending 

 from base to apex. 



Female. — Front at narrowest 0.40 of head width (measurements of 

 six 0.37, 0.37, 0.41, 0.41, 0.42, 0.42). Otherwise, except for the usual 

 differences in genitalia, like the male. 



Length, 5.5 to 7.0 mm. 



TVp^-— Male, Plinckley, Ohio, VI-29-'01 (J. S. Hine) in the col- 

 lection of Professor Hine. 



Allotype. — Female, Hinckley, Medina County, Ohio, VI-29-'01 

 (J. S, Hine), also in the collection of Professor Hine. 



Range. — Maine, Massachusetts, New York, Ohio, Maryland, 

 Virginia. 



Host relationships. — Unknown. 



Described from the following material: in the collection of Pro- 

 fessor Hine; one male and one female from Hinckley, Ohio: in the 

 collection of Dr. C. W. Johnson; one male, Machias, Maine, VII-21 

 (C. W. Johnson); one female. New Bedford, Massachusetts; two 

 females, Chester, Massachusetts, VII-25-'12 (C. W. Johnson); in 

 the collection of J. R. Malloch, one male. Glen Echo, Maryland, 

 Aug. 21, 1923 (J. R. Malloch): in the collection of R. C. Shannon, 

 one female, Renwick, Ithaca, New York, 19-Vin-'21 (L. S. West); 

 in my collection, one female. Great Falls, Virginia, 15-VIII. 



This species very closely resembles inermis from which it can be 

 distinguished by the greater length of the third antennal joint, the 

 wider frontal vitta, tlie distinctly tessellated and more extensively 

 pollinose abdomen and the presence of a perpendicular hind cross 



