290 S. W. WILLISTON. 



of the most slender species of Deromyia known to me. Species with 

 this cell widely open belong here, and those wdth it petiolate with 

 Deromyia ; but, as an actual fact, not a few species will be found in 

 which this character is variable ; indeed, my specimens of S. adustus 

 and combustus have the cell closed ; there is absolutely no discovered 

 character that wdll separate the genera. Still, the multitude of spe- 

 cies (I have seen more than thirty, chiefly from the United States) 

 of Deromyia renders its retention almost imperative. 



Liapliria pubescens Williston, Traus. Am. Ent. Soc. xi, 32. 



I have seen specimens of this species, collected by Mr. Morrison, 

 bearing the label "White Mountains." 



Atoiiiosia (Atractia) Mikii n. sp. 



3Iale. — Black, shining, white pilose ; middle tibife slender, with long bristles, 

 at the tip dilated and black pilose ; wings cinereous hyaline. Length 6 mm. 



Front, face and occiput clothed with whitish gray pollen ; on the lower part 

 of the face with a silvery reflection ; beard and thin pile of the face silky white; 

 mystax not abundant, soft, white. Antennae black ; first two joints of equal 

 length, short, with black bristles; third joint elongate, of nearly equal width 

 throughout, truncated at tip, and provided with a slender style, about a third 

 as long as the joint. Dorsum of the thorax and scutellum shining, with silvery 

 pubescence, the bristles black. Pleurse densely white poUinose, with a shining 

 black spot on the mesopleurge, the trichostical bristles white; tegulse yellow. 

 Abdomen black, shining, finely punctulate, the pubescence or short pile on the 

 posterior angles and borders white. Legs black, the tarsi largely reddish ; all 

 the tibife and tarsi with long, chiefly black bristles, on the outer side of the 

 middle pair with two very long and two shorter ones; the middle tibiie are 

 slender to near the tip, where they are dilated and provided on the outer side 

 with a tuft of black pile ; the middle metatai-si slender on the basal part, with a 

 small tuberosity near the base below ; hiud tibite on the inner side with short, 

 white and thick pile, as in Dioctria. Wings a little clouded ; first posterior cell 

 not coarctate. 



Hab. — San Domingo. 



This species differs distinctly from the three known South American 

 ones of Atractia in the pubescence, scutellum, legs, etc. The peculiar 

 structure of the middle legs in the present species is not mentioned 

 in any, though it is probably a sexual character, and the sex is not 

 given by either Wiedemann or Schiner ; nor can I tell of which sex 

 my specimens are, though I think they are males. So far as the 

 location of the genus is concerned, I object to placing it among tlte 

 Asiliiue,. My species is an Atomosia with a terminal antennal style, 

 and must be placed in the immediate vicinity of that genus. I take 

 much pleasure in dedicating this s])ecies to the distinguished Austrian 



