DICRANOMYIA. 69 



variable) ; the cross-vein separating the discal cell from the first 

 basal cell is more arcuated than usual, and hence the inner end 

 of the discal cell is comparatively but little more distant from the 

 basis of the wing than the inner end of the submarginal cell ; 

 discal cell closed. 



Eab. Trenton Falls, jST. Y. ; Canada, &c. 



Observation : The excision between the 4th and 5th joints of 

 the male tarsi is hardly perceptible in this species. 



1]^ D. lilierta 0. S. % and 9- — Grisea, thorace fusco-vittato, palpis 

 et antennis nigris, stigma pallidum, juxta venulam transversam margi- 

 nalem infuscatum. 



Gray, thorax striped with brown, palpi and antennse black ; stigma pale, 

 infuscated along the cross-vein. Long. corp. 0.25 — 0.35. 



Stn. Dicranomyia liberta 0. Sacken, Proc. Ac. Nat. Sc. Phil. 1859, p. 209. 



Kostrum and palpi black ; front and vertex gray ; antenna 

 black, with hairs of moderate length. Thorax gray, almost slate 

 color; a well-defined broad, fuscous intermediate stripe, some- 

 times with a pale line along its middle ; lateral stripes abbreviated 

 before and extended be jond the suture behind ; scutcllum slightly 

 tawny on the margins ; halteres pale, knobs dusky ; feet dark 

 tawny, pale at the base, darker brown towards the tip of the 

 femora ; tips of the tibiae and of the tarsi brown. Abdomen 

 blackish-gray; forceps of the male paler; its structure is like 

 Tab. Ill, fig. 3. Wings hyaline, faintly tinged with gray; pale 

 at the basis ; veins brownish ; a faint cloud at the root of the 

 fourth vein ; stigma oblong, pale, distinctly clouded along the 

 marginal cross-vein ; the tip of the auxiliary vein is nearly 

 opposite the origin of the second vein (sometimes a little before 

 or beyond it) ; the subcostal cross- vein is not far from its tip ; 

 discal cell closed. 



In one of the specimens the discal cell is open, on one wing 

 only. In another specimen (a female) the intermediate one of the 

 three veins running from the discal cell to the margin, takes an 

 oblique direction and forms a fork with the anterior one of the 

 three veins ; this is the case on both wings. 



Hah. United States ; seems to be common everywhere ; I have 

 collected specimens in Mobile, Ala. ; Dalton, Ga. ; Washington, 



