242 0. R. Osten Sacken: Diptera 



Drysco spreta n. sp, General coloring dark-hrown; under- 

 side of hind femora without spines; all the tarsi reddish ad the 

 hase; the dorsal abdominal segments 2 — 4 have, on the ventral 

 side, each a large hrown spot in the middle of the gray polten; 

 wings with a slight hrownish tinge. Length 8 mm. 



Although I have only two badly preserved specimens, the difFe- 

 rences from D. digna are so well marked, that I do not hesitate to 

 describe this species. The pollen ou the face is darker, more yello- 

 wish. than in D. digna; a kind of dingy yellowish gray, nearly brown 

 between the antennae, and with a brownish shadow a little lower. 

 Antennae dark brown, Front as in D. digna. Thorax with a grayish 

 stripe in the middle (which is not geminate); on each side an almost 

 circular humeral spot of the same color, each with a brown centre; 

 a faint gray line issuing from each of these circles runs backwards to- 

 wards the corners of the scutellum; the latter as in D. digna. Abdomen: 

 Segments 1 and 2 with a grayish pollen; the latter with a brown spot 

 on each side; segments 3 — 5 each with narrow grayish crossband, 

 interrupted in the middle; the crossbands on segments 3 and 4. are 

 very near the hind margin, but not upon it; on the ventral side, the 

 gray of the second segment and the gray crossbands of segments 3 and 

 4 expand so as to occupy the whole breadth of the segment, except 

 a large brown spot on each segment in the middle. This series of 

 three brown spots on each side, does not exist in D. digna, where the 

 dorsal segments are altogether grayish poUinose on the ventral side. 

 Pemora black, grayish pollinose; tibiae brown, more or less reddish 

 at base; tarsi brown, first Joint reddish. Wings subhyaline, with a 

 slight brownish tinge; posterior crossvein oblique, but less so than in 

 D. digna and therefore much less parallel to the alar margin; only 

 slightly bisinuate. Kälteres brownish-red, — Two specimens. (Perhaps 

 females, as the first joints of the front tarsi are not incrassated?) 



NB. These specimens must have been subjected to moisture, and 

 for this reason the face, the stripes on the thorax etc. are perhaps 

 darker than they should have been. — D. spreta is, in many respects, 

 nearer to C. fasciatus Jaennicke, than D. digna: still the total absence 

 of an intermediate thoracic stripe (in the figure; but the description 

 says: three stripes?); the diiference in the shape of the abdominal 

 crossbands; the ,, Adern schwach gesäumt", tend to prove that it is a 

 different species. 



