ZENILLIA AjSTD ALLIED GENERA — SELLERS 105 



in female three to three and one-half times as long as second seg- 

 ment; arista thickened on basal fourth, penultimate segment short. 



Thorax gray-pollinose ; three postsutural dorsocentral macro- 

 chaetae; three pairs of marginal and one shorter cruciate pair of 

 apical scutellars, one pair of discal scutellars; three sternopleural 

 macrochaetae ; midtibia bearing two bristles on median anterolateral 

 side and one inner ventral bristle; hind tibia with irregularly placed 

 bristles of uneven length on anterolateral side; third vein with two 

 or three bristles at base. 



Abdomen black covered with gray pollen; entire first segment 

 shining black ; dorsal abdominal hairs depressed ; first segment with 

 a pair of marginal macrochaetae, second segment with a pair of 

 discal and a pair of marginal macrochaetae, third segment with 

 usually four discal macrochaetae in a line and a marginal row, 

 fourth segment irregularly tipped with marginal and submarginal 

 bristles approaching the size of macrochaetae in male only. 



Length of type 8 mm. 



Type locality. — University, Grand Forks, N. Dak. 



Type.— Male, U.S.N.M. No. 3752 (Coquillett listed it as a female). 



Distribution.— Wisconsin 3, North Dakota 2, South Dakota 1, 

 Texas 1. 



Host. — Unknown. The genotype, Thelymyia saltuum, has been 

 recovered from Catocala sponsa (Linnaeus). 



Remarks. — The description is based on the type male and on three 

 males and three females collected by Aldrich, Baker, and Bishopp. 

 Rolla P. Currie collected the type specimen. The times of collections 

 ranged from April 19 in Texas to July 17 in Wisconsin. 



2. THELYMYIA ERECTA, new species 



Zenillia curriei (Coquillett) Aldrich and Webber (partim), Proc. U. S. Nat. 

 Mus., vol. 63, art. 17, pp. 33-34, 1924. 



This species is very similar to Thelymyia curriei. The differences 

 have all been cited in the key to the species (p. 104). Otherwise the 

 species are practically the same. 



Male (type). — Head with front at narrowest 0.37 head width; 

 facial ridge bristly on one-half to two-fifths; gena one-sixth eye 

 height, dark gray black, subshining; antenna black, third segment 

 four times as long as second; arista thickened on basal one-third. 



Thorax covered with such a thin layer of pollen as to appear shining 

 black; sternopleural macrochaetae four on one side, five on the other; 

 midtibia with four median anterolateral bristles on one side and 

 two with one smaller on the other side. 



Abdomen covered with such a thin layer of pollen as to appear 



