Vol. 32, pp. 133-134 June 27, 1919 



PROCEEDINGS 



or THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



TWO NEW NORTH AMERICAN ANTHOMYIIDAE 



(DIPTERA). 



BY J. R. MALLOCH. 



The two species described in this paper have been in my hands 

 for two years or more, having been submitted by the United 

 States Bureau of Biological Survey for identification. Some of 

 the paratypes of the second species were sent to me nearly two 

 years ago by Dr. R. R. Parker from Montana. The type speci- 

 mens will be deposited in the National collection. 



Mydaea winnemana, sp. n. 



Male and female. — Black, glossy. Orbits, face, and cheeks in both sexes 

 with white pruinescence ; interfrontalia of female opaque black, triangle 

 shining. Antennae and palpi black, second antennal joint, and third at 

 base brownish. Thorax with faint grayish pruinescence, the disc with two 

 narrow black vittae which are visible only on anterior half. Abdomen with 

 a very faint dorso-central vitta. Legs reddish or yellowish-testaceous ) 

 femora basally in variable degree, and tarsi entirely blackened. Wings 

 clear, veins pale brown. Calyptra white. Halteres yellow. 



Male. — Eyes bare, separated by about width across posterior ocelli; 

 parafacial in profile almost invisible; cheeks not distinctly higher than 

 width of third antennal joint, with a marginal series of fine bristles; vibrissa 

 very strong; antenna extending nearly to mouth margin, third joint nearly 

 3 times as long as second ; arista with the longest hairs distinctly longer than 

 width of third antennal joint; palpi normal. Prealar bristle very small; 

 postsutural dorso-centrals 4; hypopleura with a few microscopic hairs near 

 lower posterior angle. Abdomen broadly ovate; fifth sternite with a broad 

 rounded posterior marginal excision, a long bristle on each side at base of 

 excision. Fore tibia unarmed; mid tibia with 3 posterior bristles; hind 

 femur with a series of short, fine bristles on antero-ventral surface, which 

 become longer apically, and a few short, fine bristles on basal half of postero- 

 ventral surface. Veins 3 and 4 divergent apically. 



Female. — Eyes at vertex separated by a little less than one-third of the 

 head width, the frons widened anteriorly; each orbit with 5 or 6 moderately 

 strong bristles and numerous short setulose hairs; triangle continued to 

 26— Proc. Biol. Soc. Wash., Vol. 32, 1919. (133) 



