46 Orthorrhapha brachycera. 



Occiput grey; the postocular bristles whitish. Antennæ yellow, arista 

 brown. Thorax grev, with a very faint, greenish reflex; there is a 

 small, yellowish humeral point. Sculellum yellow, with two black 

 bristles, and on each side a small hair; postscutellum grey. Pleura 

 grey, metaepimera reddish yellow; there is a whitish prothoracic 

 bristle. Abdomen yellow or brownish yellow, somewhat shining; the 

 sixth and seventh segments hidden ; the fifth ventral segment seems to 

 have no ventral teeth (but I have only examined one specimen). Ab- 

 domen clothed with short, black hairs, becoming pale towards the side 

 margins. At the hind margins of the segments are short bristles, 

 those on the first segment long. Venter yellow, with yellow hairs. 

 Hypopygium blackish brown, shining; it seems to be constructed quite 

 as in quadrifasciata, but is a little smaller. Legs yellow, the last 

 four joints of the posterior tarsi brownish. Anterior metatarsi about 

 of the length of the four following joints, hind metatarsi shorter than 

 the second joint. Front coxæ yellow-haired on the anterior side, with 

 some bristles downwards, middle coxæ with some black bristles 

 anteriorly, hind coxæ with a black bristle on the outer side. The 

 legs otherwise with short, blackish hairs, the anterior femora bare 

 beneath. Front tibiæ with some small bristles on the dorsal side, 

 posterior tibiæ with bristles on the various sides, and with apical 

 bristles, and the posterior metatarsi with some bristles, the hind ones 

 only below. Wings a little yellowish ; veins brown or blackish brown ; 

 the discai vein distinctly bent, ending before the apex of the wing, 

 the first posterior cell narrowly open; the posterior cross- vein lying 

 rather inwardly, near the middle of the wing; axillarly lobe small. 

 Squamulæ whitish, with a whitish fringe. Halteres yellow. 



Female. Epistoma a little broader than in the male. Thorax 

 grey as in the male. Also the front tarsi brownish towards the end. 

 Wings with the axillary lobe a little larger. 



Length 4— 4,5 mm. 



This species can only be confused with N. saturalis, but is easily 

 distinguished by the unbanded abdomen, the course of the discai vein, 

 and the position of the posterior cross-vein. 



N. abdominalis is very rare in Denmark, only three specimens, a 

 male and two females, are known (Stæger), one taken in Charlotten- 

 lund on ^^/t 1846. Stæger took it on Corylus. 



Geographical distribution:— As far as I am aware this species is 

 not known south of Denmark; towards the north it goes to middle 

 Sweden. 



