268 Orthorrhapha brachycera. 



the anterior tibiæ, middle tibiæ besides with two anlero-ventral and 

 sonie small ventral bristles; front metatarsi short-ciliated above and 

 below, the second joint above; middle metatarsiis with small bristles 

 below, longest at the base. Wings almost hyaline; veins black, discai 

 vein with a small, even curve. Squamulæ yellow, with a white fringe. 

 Halteres pale yellow. 



Female. Frons æneous. Epistoma broad, brownish ; palpi large, 

 brownish grey. Antennæ short, the third joint about as long as the 

 two basal ; arista not twice as long as the antennæ. Legs with the femora 

 yellow and quite short-haired ; front tarsi simple, the first joint about 

 as long at the two next, the middle metatarsi about of the length of 

 the three next; anterior coxæ with no black hairs at apex. Wings 

 somewhat brownish tinged. 



Length 3,8—4,7 mm. 



P. consohrina is rare in Denmark, we have only six specimens in 

 all; Amager (Stæger, the author), at Fure Sø and on the little island 

 Egholm at Skelskør (the author); in Jutland at Ringkøbing Fjord 

 (Th. Mortensen). My dates are ^^l-^ — ^'Vs. It has nearly always been 

 taken in grass near the shore, and it seems to prefer salt marshes, 

 which has also been previously recorded. 



Geographical distribution : — Northern and middle Europe down 

 into Germany; towards the north to northern Scandinavia, and in 

 Finland. It is also recorded from North America, Aldrich thinks how- 

 ever the indentification somewhat premature. 



7. P. riparia Meig. 



1824. Meig. Syst. Beschr. IV, 53, 18. — 1903. Kat. palaarkt. Dipt. 

 II, 330. — Rhaphmm praerosutn Loew, 1850. Stett. ent. Zeitg. XI, 108, 9, 

 Tab. I, Fig. 21—23. — Porphyrops praerosus 1862. Schin. F. A. I, 198. 

 — Porphyrops tennis Verr. 1876. Ent. Month. Mag. XII, 197. 



Male. Vertex and frons greenish, somewhat greyish pruinose; 

 eyes pale-hairy. Epistoma narrow, silvery white. Palpi dark. Occi- 

 put green, a little greyish pruinose; postocular hair black above, 

 white below. Antennæ black, not fully as long as the head, the third 

 joint about as long as the two basal, oval, not pointed ; arista a little 

 longer than the antennæ; the second antennal joint short-haired be- 

 low and with a long hair above. Thorax dark green, a little pruinose, 

 shining; it has two approximated, black stripes in the middle. Pleura 

 greenish, grey pruinose; propleural hairs white. Abdomen dark green, 

 with narrow, black incisures; it is clothed with short, black hairs, 

 long and pale at the sides of the first three segments; there are 

 hindmarginal bristles, long on the first segment. Venter greenish, grey 



