516 



UNITED STATES NATIONAL MUSEtJM BULLETIN 224 



appressed and setate dorsally and laterally. In the type 

 of genus there is the following complement of bristles : 

 3 lateral elements on the outer half, 1 subapical dorso- 

 lateral, and 1 corresponding dorsomedial and 1 weak, 

 apical dorsomedial, besides 7 rather long, comparatively 

 slender, pale, ventral bristles. The hind tibia has 6 

 dorsal, 3 dorsolateral, 7 ventromedial, and 2 ventro- 

 lateral bristles. Middle femur with 1 long, stout an- 

 tero ventral bristle just beyond the middle, a similar, 

 stout, anterior element at the apical third and 1 pos- 

 terodorsal apical bristle. This tibia bears rather long, 

 stout bristles, 3 posterodorsal beginning near the basal 

 third, and on the outer half 2 anterodorsal and 2 ventral 

 bristles. Anterior femur with a row of slender, bristly 

 hairs posteroventrally ; its tibia has a pair of doi-sal 

 bristles near the base and 4 or 5 posterodorsal, besides 

 2 fine, and 1 subapical, quite stout, posteroventral 

 bristle. Anterior basitarsus slender, slightly longer 

 than the next two segments; all tarsi end in sharp, 

 slender claws, well developed pulvilli and unusually 

 short, basally stout empodium. 



Wings: The wings are slender; the marginal cell is 

 closed with a long stalk; the subcostal cell is quite 

 narrowed but the costal margin is not expanded and 

 the marginal cell is comparatively narrow through the 

 middle. The anterior branch of the third vein is almost 

 straight, except at the immediate base; it ends a short 

 distance before the wing apex; the posterior branch 

 ends a distance three times greater beliind the wmg 

 apex. First posterior cell slightly narrowed in the 

 middle ; the second posterior cell is only gently sloping 

 and not arched basally; this cell is expanded as much 

 posteriorly as anteriorly, widely open but narrowed 

 distally. Fourth posterior cell closed with a long stalk ; 

 the cell is long and very slightly convex on all sides. 

 Anal cell closed, the second basal cell ends in two veins 

 which fuse a short distance beyond ; the lower end vein 

 of the discal cell is very strongly pulled back toward 

 the base of the wing. Alula rather short ; ambient vein 

 complete. 



Abdomen : The abdomen is strongly tapered ; seven 

 tergites present in the female, the seventh abnost as 

 long as the sixth. Pile of the abdomen short, fine, ap- 

 pressed and setate with longer, erect pile laterally on 

 the first three tergites. First tergite moderately pro- 

 tuberant, with only fine, bristly hairs laterally or a few, 

 extremely weak bristles. Lateral postmargins of sec- 

 ond to fourth segments with several pairs of weak 

 bristles. Fii-st sternite without pile, second and third 

 with long, fine pile; the remainder with rather short 

 setae and sometimes 1 or 2 weak, slender bristles. Fe- 

 male terminalia moderately elongate, rather strongly 

 compressed laterally. The eighth tergit© is strongly 

 flattened on top and gently tapei-ed towards the apex, 

 but all the lateral portion is very strongly compressed ; 

 ninth and tenth tergites short, the latter with a pair of 

 short, dorsal, basally stout, laterally flattened, sharp, 

 spinous processes which have a deep notch between. 



Genus Eremisca Zinovjeva 



FiQUKES 2506, 2516, 2528, 2529 



Eremisca Zinovjeva, Eiit. Oboz., vol. 35, pt. 1, p. 196, 1956. Type 

 of genus. Eremisca vernalis Zinovjeva, by present desig- 

 nation. 



I give below Zinovjeva's description in translation: 



Slender flies of moderate size and yellowish gray sUvery 

 coloring characteristic for desert insects. Length 14 to 16 mm. 



Head narrower than thorax. Frons narrow, comes slightly 

 beyond the eye at the margin of the mouth. Tlie frontal hump 

 is poorly developed, relatively flat. The distance from the 

 upper margin of the frontal hump to the base of the antennae 

 is equal to the length of the first two segments of the antennae. 

 The beard is of long, thick setae. The ocellar cilia along the 

 sides of the head form bundles of hairs ".side-burns". The 

 third segment of the antennae is shorter than the first two seg- 

 ments taken together. The dorso-central setae (2 or 3) come be- 

 hind the transverse suture. 



The alar and notopleural setae are developed. The whole 

 scutellum is densely covered with setae and hairs. The coxae 

 of the legs, especially of the fore, are covered with long hairs. 

 The femur on the inner surface bears a niunber of setae. The 

 claws are long. All the legs are covered with short, closely- 

 fitting hairs and long setae. The wing venation is usual (fig. 1, 

 Eremisca vernalis Zin., sp. n., wing.). 



The abdomen is longer than the wings ; there are long setae 

 along the hind margin of the middle tergites. The abdomen 

 is covered with pollen and hairs. The ovipositor is cylindrical, 

 is not constrained from the sides and at the apex is elongated 

 into two points. The coxites of the hypopygium are narrow, 

 elongated, rounded on the end. 



Head, thorax, legs and abdomen covered with white hairs and 

 setae. 



The described genus stands close to the genus Ccrdistus Loew ; 

 postscutellum with dusty hairs, tergites of abdomen along the 

 hind margin with setae, dorsocentral setae continue beyond the 

 cross suture of the mesonotum, and the frontal suture is weakly 

 developed. However, it differs sharply from Cerdistus in the 

 structure of the ovipositor, which is not constrained from the 

 sides and on the apex is elongated into two points, and also in 

 the presence of numerous, long, protruding hairs on the scutel- 

 lum (fig. 2, E. vernalis Zinovjeva, female). 



Distribution: Palaearctic: Eremisca vernalis Zinov- 

 jeva (1956) ; autumnalis Z\noY]ev& (1956). 



Cnodalomyia, new genus 



FiGtTKES 787, 1546, 1555, 2195, 2271 



Type of genus Onodalomyiu obtusa^ new species. 



Medium size flies related to Cerdistvs Loew. The 

 second submarginal cell is quite slender and narrow at 

 the base, widened entirely in front of the third vein; the 

 anterior branch of the third vein is nearly straight, end- 

 ing slightly before the wing apex ; the posterior branch 

 is straight for most of its length, rather strongly curved 

 backward ; the male terminalia are exceptionally large 

 and wide with a gap between the forceps and gonopod 

 as in Astochia Becker. The aedeagus and penis guides 

 are remarkably large, arched into a short loop ventrally 

 and curved backard. Length 19 mm. 



Head, lateral aspect : The head is of medium length, 

 the face nearly plane with the eye on the upper half, 

 very slightly produced on the lower part with the cheeks 



