66 A REVISION OF THE NEARCTIC SCIOMYZIDAE 



abdomen. The frons with the convex polished median area, 

 black. Wings as figured (fig. 11). Length.— 4 to 5 mm. 



Originally described from a female from Lake George, New 

 York, (Osten Sacken), [Mus. Com p. Zool.?]. 



Specimens Examined. — 4 cf , 11 9- 



New York: Ithaca, June 25-August 2; McLean, June 20- July 2-3; Mud 

 Creek, June 17-20; Slaterville to Caroline, June 14; Woodwardia Bog; [all 



Cornell]. 



Pknnsylv.^nia: Swarthinore, June 11-August 3, (Cresson), [A. N. S. P.]. 

 Illinois: [A. N. S. P.]. 



TRYPETOPTERA Hendel 

 1900. Hendel, Ver. K. K. Zool.-Bot. Ges., Wien, 1, 352. 



The species of this genus differ from those of Limnia in that 

 the excavated polished frontal stripe is wanting, or only a faint 

 grove or grayish line is indicated in its place. In this respect they 

 should not be confused with those of Hoplodictya or Monochaeto- 

 phora. The former has the anterior frontal bristle proclinate and 

 the prescutellars absent. The latter has but one frontal bristle 

 and the legs consi^icuously banded with brown. The lateral 

 denuded area of the second antennal joint, in this genus, is opaque, 

 not polished as in Limnia, and there are two bristles on the upper 

 margin; the arista is black plumose. 



Genotype. — Musca punctulata Scopoli (1763), by original desig- 

 nation. 



Trypetoptera pallida Loew (PI. I, fig. 17; pi. Ill, fig. 32.) 

 1859. Tctcuiorcra pallida Loew, Wien. Ent. Monat., iii, 294. 



In our only known species of this genus the eyes are horizontal; 

 frons opaque, wax yellow; fi'ontal orbital spot reduced; second 

 and Ihird antennal joints short, the latter rather equilaterally 

 triangular in shape, opaque, with whitish pubescence, more or less 

 rounded apicaliy. Wings with marginal cell infuscated, with six 

 or more clear spots which do not attain the costa. Otherwise 

 in the wing design and general habitus the species is similar to 

 Limnia combinala. Length. — 4 to 6 nun. 



This species is under Tetanocera canadensis Macquart in most 

 collections, but I cannot consider the synonymy as established 

 from Macquart's description or figures. 



Originally described from AVashington, D. C. 



