40 A REVISION OF THE NEARCTIC SCIOMYZIDAE 



Dichrochira glabricula Fallen 



1820. Sciomyza glabricula Fallen, Dipt. Suec, Sciom., 15. 



1902. Dichrochira glabricula Hendel, Abh. Zool.-Bot. Ges. Wien, ii, 61. 



A male from Popoff Island, Alaska, July 13, (T. Kincaid), 

 [U. S. N. M.], agrees well with the description by Hendel. The 

 anterior part of the frons, antennae, face, lower occiput, meso- 

 pleura, fore coxae, base of fore femora, middle and hind legs 

 entirely, squamae and root of wings, pale yellow. All other parts 

 black. There are two frontal bristles, and the arista is short 

 plumose. Length. — 3 mm. 



ATRICHOMELINA new genus 



I propose this genus for the reception of Sciomyza piihera 

 Loew, its genotype. The propleural bristle is microscopic, so 

 at first easily overlooked, but after examining a series of speci- 

 mens one will find this l:)ristle is present, but more strongly devel- 

 oped in some specimens than in others. It is easily confused with 

 the near-by pile or setulae on the mesopleura. The pteropleura 

 are setulose without the two or three characteristic bristles as in 

 Melina proper, although in that genus these bristles are rather 

 numerous and suggesting long setulae. There is only one well 

 developed frontal bristle, with or without an adjacent minute 

 anterior one. 



Atrichomelina pubera Loew 



1862. Sciomyza pubera Loew, Mon. Dipt. N. A., i, 106. 



This species should not be confused' with Melina similis or 

 V'i talis. 



cf , 9 • Dark species. Frons opaque or faintly shining. Mesonotum 

 distinctly striped with brown. Abdomen dark brown with medianly inter- 

 rupted, whitish, apical margins to segments. Fore legs dark, with basal 

 joints of tarsi conspicuously whitish. Wings hyaline with cross-veins clouded. 

 In some specimens the apical pale border of the segments enlarge into sub- 

 lateral triangles which attain the bases of the segments, so that the abdomen 

 appears rather whitish with a median and lateral series of brown triangles. 

 This condition is more noticeable in the western specimens, which are also 

 larger (5 to 6 mm.). The abdominal pile longer than is usual in Melina. 

 Length. — 4 to 6 mm. 



Originally described from a male from the Middle States. 



Specimens examined. — 19 cf, 11 9 • 



Connecticut: Winnipank, August 4, (C. W. Johnson), [B. S. N. H.]. 



