66 Bulletin of the Brooklyn Entomological Society Vol.X 



Thorax reddish yellow on disc ; pleurae pale yellow ; a black spot 

 below wing-base and another on posterior surface of mid coxa. 

 First abdominal segment entirely yellow, the others with a dull 

 black spot on each side at anterior angles, and indications of a 

 central row of paler spots. Legs yellow, apices of hind femora 

 blackened. Wings slightly grayish, veins blackish brown. All 

 hairs and bristles black. Halteres yellow. 



Frons slightly broader than long, central furrow poorly de- 

 fined ; one pair of strong post-antennals ; central pair of bristles 

 in first row distinctly below the level of outer pair and much 

 closer to the latter than to the post-antennals, though not in 

 vertical line with the outer pair ; second row almost straight ; 

 surface of frons with numerous short hairs ; antennse moderate in 

 size, third joint rounded; arista very slender, bare, about one and 

 a half times as long as width of frons ; palpi larger than antennse, 

 strongly bristled ; cheek with one long downwardly directed 

 bristle and a series of about eight weaker bristles which increase 

 in length from posterior to anterior end of series. Mesopleura 

 bare ; scutellum with four bristles. Abdomen broad at base, 

 tapering to apex ; segments subequal, without conspicuous 

 bristles. Fore tarsus slender ; hind femora dilated ; hind tibiae 

 with the setulse regularly arranged, thirteen in the series, only the 

 apical one stronger than the others. Wings with costa to middle ; 

 first division one and a third times as long as 2 -|- 3 ; second 

 division twice as long as third ; angle at fork of third vein acute, 

 its base about midway from apex of second vein to apex of first ; 

 fourth vein gently arcuate at base, leaving distinctly beyond 

 fork of third, fringe of moderate length, rather close. 



Length, 2.5 mm. 



Type locality, Urbana, III, June 14, 1914 (E. H. Swigert). 



Allied to A. fisheri Malloch and inceqiialis Malloch, from both of 

 which the presence of only one pair of post-antennals separates it 

 readily. 



