J. R. MALLOCH 133 



DESCRIPTIONS OF NEW NORTH AMERICAN ANTHOMYIIDAE 



(DIPTERA) 



BY J. R. MALLOCH 



Tho present paper was originally prepared with a numl^er of 

 ta})les of species and references to previously known forms in- 

 cluded. Editorial necessity and limitations of space have made 

 necessary the restriction of the matter to the description of new 

 s]3ecies. The accompanying plates, however, contain illustrations 

 of a number of previously known species, which it seemed best 

 to have appear at this time. Reference subsecjuently will be 

 made to these illustrations. 



Phaonia basiseta sj). n. 



Male and female. — Black, slightly shining, densely yellowish brown pruines- 

 cent. Thorax with four blaek vittae. Abdomen with a poorly defined 

 florso-central black vitta and irregular oheckerings. Wings clear, yellowish 

 at bases. Calyptrae and halteres orange yellow. 



Male. — Eyes distinctly hairy, separated at narrowest ])art of frons by a 

 distance about equal to width across posterior ocelli; iiarafacial in profile 

 much wider than third antennal joint and about half as wide as height of 

 cheek, the latter with numerous moderately long marginal bristles, the upper 

 series upwardly cin-ved; vibrissa in line with lower margin of eye and much 

 above lower margin of cheek, a few short bristles above vibrissa; antennae 

 aljout two-thirds as long as face, third joint about 1.75 as long as second; 

 arista with its longest hairs slightly shorter than width of third antennal 

 joint. Thorax with four pairs of postsutural dorso-central bristles, no long 

 l)resu1ural acrostichals, and the prealar bristle over half as long as the one 

 behind it; hy])opleura with a number of hairs on its upper margin in front of 

 spiracle. Abdomen narrowly ovate; fifth sternite inconspicuously bristled. 

 Fore tibia with two or three postero-ventral bristles; fore tarsus longer than 

 fore tibia; mid femur with a few long bristles on basal half of postero-ventral 

 surface; mid tibia with three or four postero-dorsal and three or four posterior 

 bristles; hind femur with a series of bristles on the antero-ventral and another 

 on the i)ostero-ventral surface, the latter series sparse and the bristles short 

 in middle; hind tibia with two or three antero-ventral and from four to six 

 antero-dorsal bristles, the postero-dorsal surface with one or two short bristles 

 near base in addition to the preapical calcar. One of the costal thorns much 

 longer than the other; outer cross-vein slightly bent. 



Female. — Eyes with very short hairs; frons narrowed slightly at vertex 

 where it is less than one-third as wide as head. Abdomen with ajiex pointed, 

 fourth tergite longer than third; genital processes of moderate length, with 



TRANS. .^M. KNT. SOC, .XLVI. 



