Dolichopodidae. 47 



5. N. Erichsoni Zett. 



1843. Zett. Dipt. Scand. II, 613, 100 (feminis pluribus exclusis), et 

 1849. VIII, 3097, 100 (Dolichopus). — 1862. Schin. F. A. I, 184. — 

 1903. Kat. palåarkt. Dipt. II, 292. 



Male. Frons and vertex grey, the bristles black. Eyes contiguous 

 below the antennæ, and the epistoma thus divided into two small, 

 white triangles, an upper and a lower. Palpi whltish yellow. Occiput 

 grey; the postocular bristles all whitish (in the specimens I have 

 examined, according to Oldenberg, Zeitschr. f. syst. Hymn. and Dipt. 

 IV, 1904, 76, one to three of the uppermost may be black). Antennæ 

 yellow, arista brown. Thorax yellow, the humeral and side parts 

 paler, jin front of the scutellum a faint, abbreviated, darker stripe. 

 Seutellum yellow, with a small, darker spot at the base in the middle. 

 Postscutellum yellow, with a faint, darker middle stripe. Pleura yel- 

 low, very slightly whitish pruinose, below the squamulæ a black spot; 

 there is a whitish prothoracic bristle. Abdomen yellow or reddish 

 yellow, a little shining; the sixth segment nearly, the seventh quite 

 hidden; at the front margin of the second, third and fourth segments 

 a blackish, transverse band; a similar but very faint one on the fifth 

 segment; also at the base of the first segment a narrow, black stripe. 

 Abdomen clothed with short, blackish hairs, becoming pale just at the 

 side margins ; at the hind margin of the segments are a little longer 

 bristles, those on the first segment long. Venter yellow. Hypopygium 

 black or brownish black, shining, the eighth segment with pale hairs; 

 the hypopygium seems to be constructed as in quadrifasciata; it has 

 very small, nearly hidden, outer lamellæ ; of the inner lamellæ a pair 

 of small styles are seen above, and another pair at the end, the latter 

 directed upwards. Legs yellow, the posterior tarsi a little darkened 

 towards the end. The front tarsi short, shorter than the tibiæ, meta- 

 tarsus longer than the four folio wing joints, which are short, the three 

 middle ones not longer than broad, the claws and pulvilli enlarged; 

 middle metatarsus about as long as the four following joints, hind 

 metatarsus considerably shorter than the second joint. Front coxæ 

 with yellow hairs on the anterior side, and front and middle coxæ 

 with black bristles anteriorly towards the end; hind coxæ with a 

 black bristle on the outer side. For the rest the legs with short, 

 blackish hairs, the middle femora bare beneath; the front femora 

 have below a row of fine, erect hairs, which are longer and some- 

 what distant in the basal half, short and dense in the apical half, 

 and the front tibiæ have below a fine, short, somewhat erect cilia- 

 tion. The front tibiæ have a small bristle on the anterior side near 

 the base, the posterior tibiæ have bristles on the various sides, and 



