Dohrniphora. 157 



brownish or brownish yellow; hind femora dilated; front tibiæ with 

 a dorsal bristle above the middle, middle tibiæ with a pair at aboiit 

 the upper fourth and a small anterior bristle at apex, hind tibiæ with 

 two anterodorsal bristles at about the upper fourth and the lower 

 third and with a dorsal furrow enclosed by two palisade-like rows 

 of hairs. Wings yellowish or yellowish brown, veins yellowish brown, 

 or the thick veins darker; costa reaching to the middle or about; 

 1 about double 2 + 3; fork very acute and relatively long; costal 

 ciha short; fourth vein issuing before the base of the fork, quite 



Fig. 59. Wing of D. Oldenbergi ^ . 



slightly curved and curved very little downwards towards apex. 

 Halteres black or blackish brown. 



Female. Similar; frons a little broader, distinctly broader than 

 high; antennæ smaller and paler below third joint; palpi larger, 

 brownish, with long bristles. Abdomen with first segment roundly 

 excised in the hind margin and thus short in the middle, second 

 segment elongated, fourth a little narrowed but more than twice 

 as broad as long, fifth and sixth without tergal piates ; the last narrow 

 segment reddish, 



Length 2,8 — 3,5 mm. 



D. Oldenbergi is somewhat rare in Denmark, and all specimens 

 have been bred from pupæ; Utterslev Mose in May (Schlick), Dam- 

 husmosen in April and May (Schlick, Larsen, the author); the pupæ 

 were found in flood refuse, the imagines were bred in May. The male 

 was hitherto not known. 



Geographical distribution: — Besides from Denmark only known 

 from Germany. 



5. D. abdominalis Fall. 



1823. Fall. Dipt. Suec. Phytom. 5, 2, ? {Trineura). - 1830. Meig. Syst. 

 Beschr. VI, 225, 40, ? {Phora). - 1848. Zett. Dipt. Scand. VII, 2867, 17, ? 

 {Trineura). — 1864. Schin. F. A. II, 336 (Phora). — 1901. Beck. Abhandl. 



