224 PROCEEDINGS OF THE ACADEMY OP 



covered with a short pubescence ; femora slightly incrassated at tip. Tibia? 

 without spurs at tip. Tarsi with distinct pulvilli. Wings of moderate length, 

 with two radial area and without petiolated areolet ; (almost like Meig. i. tab. 

 v, f. 4 orf. 6.) Mediastinal cross-rein at a moderate distance from the tip of 

 of mediastinal vein. Forceps of the $ (fig. 18) consisting of comparatively 

 short basal pieces, of the usual horny appendages, one pair are very long, 

 slender, linear and slightly arcuated ; the other is short and stout ; 9 ov i- 

 positor elongated, slender, slightly arcuated ; the lower pair of valves is very 

 short and do not reach much beyond the origin of the upper pair, (fig. 18 a.) 

 This genus is very much like E r i o p t e r a in its general appearance ; the 

 body is rather short and stout ; the intermediate pair of feet is like in E r i o p- 

 t e r a, a little shorter than the other two. But it differs from the latter genus 

 by its glabrous wings and the structure of the genital organs in the ^ and 9 

 The structure of the 9 ovipositor is somewhat analogous to that of S y m- 

 p 1 e c t a. The dark, lugubrious coloring ofGnophomyia seems to be also 

 characteristic. The name of the genus alludes to it. 



G. luctuosa. Atra, halteribus atris ; alis obscura infumatis ; long. lin. 



The whole body, including the halteres, is of a deep velvet black. Wings 

 smoky, nearly black ; subcostal area still darker ; stigma hardly distinct ; a 

 short almost microscopic pubescence in the centre of the apical areolet ; the 

 stigmatical cross-vein is at the origin of the second radial area. 



Single cf specimen caught in Florida, in March, 1858, (nob.) 



Gr. tristissima. Nigra, pedibus piceis, halterium capitulis flavis ; ala? 

 pallide infumata?, stigmate oblongo, obscuro ; long. lin. 2^-3. 



The whole body is black, moderately shining ; thorax gibbose ; a slight 

 hoary reflection on the lower part of the pleura? and sometimes on the front ; 

 feet piceous, base of femora dark tawny ; halteres brown with yellow knobs ; 

 wings dusky with a blackish, elongated stigma, divided longitudinally in two 

 by the subcostal vein ; veins black, paler at base ; fig. 18 represents the tf for- 

 ceps of this species ; fig. 18 a, the 9 ovipositor. 



Washington, New York, Virginia mountains in the Spring and in Summer, 

 common. Upper Wisconsin River (Mr. Kennicott.) 



Compared eleven tf 9 specimens. 



Cryptolabis nob. 



Antenna? 16-jointed, joints of the flagellum oval, hairy. Proboscis short ; 

 palpi with subcylindrical joints of nearly equal length. Feet moderately 

 long, tibia? without spurs at the tip. Tarsi with small pulvilli. Wings 

 of moderate length and breadth ; petiole very short and oblique, so that 

 the first radial area has the form of an almost equilateral triangle ; two 

 radial area? and no petiolated areolet ; the central cross-veins at the base of 

 the second radial, the cubital, the subapical and the first externo-medial area?, 

 form one line, being connected at their ends ; the stigmatical cross-vein (or at 

 least the vein replacing it) is the continuation of the same line ; the second 

 externo-medial area is shorter than the first ; the great cross-vein is a little 

 nearer to the tip of the wing than the other central cross-veins ; the mediastinal 

 cross-vein is a little anterior to the origin of petiole and very indistinct. For- 

 ceps of the $ somewhat like that of Antocha, but the falciform appen- 

 dages are small and, in the state of repose, so closely applied to the under side 

 of the basal pieces as to be indistinct. Ovipositor of the 9 obtuse, soft, 

 without any apparent horny lamels. (Fig. 14, 14 a and 15, 15 a male and 

 female genitals of C. paradoxa.) 



This genus is sufficiently distinguished from all others by the neuration of 

 the wings and the structure of the genitals. The absence of the horny lamels 



[Aug. 



