118 DIPTERA OF NORTH AMERICA. [PART IV. 



Brownish-ochraceous ; wings with, a fulvous tinge, opalescent ; the prae- 

 furca is much longer than the discal cell. Long. corp. 0.4 — 0.45. 



Syn. Dicranoptycha germana 0. Sacken, Proc. Ac. Nat. Sc. Phil. 1859, p. 217. 



Head yellowish-cinereous ; palpi brown ; antennas tawny at the 

 basis, darker towards the tip. Thorax brownish-ochraceous, 

 mesonotum above, especially posteriorly, the scutellum and the 

 metathorax with a more or less distinct brownish-gray bloom ; 

 lower part of the pleurae somewhat hoary ; halteres ochraceous. 

 Feet ferruginous-tawny, clothed with black hairs ; tips of the 

 tibiae infuscated ; last joints of the tarsi brownish. Abdomen 

 brownish-ochraceous, more or less dark ; in the male, the last seg- 

 ment is sometimes brown ; forceps ochraceous. The wings are 

 of a saturate, fulvous tinge, with a peculiar bluish, opalizing 

 reflection ; the veins are fulvous and distinctly pubescent ; if 

 viewed obliquely, the veins appear yellow on bluish ground. The 

 praefurca is about once and a third the length of the discal cell ; 

 the latter is more than twice as long as it is broad ; its inner end 

 is sometimes straight, sometimes oblique and arcuated. 



Hah. Trenton Falls, N. Y., where I found this species to be 

 very common in July, 1858. 



The description is drawn from dry specimens ; among the notes 

 which I took from living ones, I find the following character 

 mentioned : " Abdomen yellow, with five brown spots along the 

 margins, at the incisures." One of the specimens has a stump 

 of a vein near the origin of the praefurca. 



2. D. sotorima 0. S. % and J . — Fuscano-cinerea, alis subcinereis ; 

 praefurca cellula discoidali non longior. 



Brownish-cinereous, wings subcinereous ; praefurca not longer than the 

 discal cell (Tab. I, fig. 8). Long. corp. 0.4—0.45. 



Syn. Dicranoptycha sobrina 0. Sacken, Proc. Ac. Nat. Sc. Phil. 1859, p. 218. 

 Dicranoptycha sororcula 0. Sacken, 1. c. 



Head yellowish-gray ; palpi brown ; antennae brownish ; two 

 basal joints paler; the first with a whitish bloom (in some speci- 

 mens these joints are more infuscated). Thorax gray, with a 

 yellowish-brown bloom above, indicative of the ordinary stripes ; 

 the latter are more or less distinctly marked ; pleurae hoary, 

 halteres pale ; feet tawny, densely clothed with a moderately 

 long, black pubescence ; fore femora sometimes brown, except at 



