Pipunculus. 57 



ceptible on hind femora; hind trochanters armed with some small 

 bristles at the base below. Wings slightly tinged, stigma absent and 

 third costal segment about half as long as fourth, middle cross-vein 

 at or beyond the middle of the discai cell. Halteres yellow. 



Female, Similar; frons black and shining above but greyish on 

 the lower half or two thirds; hypopygiiim with the basal part ovate, 

 shining, somewhat pruinose, the reddish ovipositor longer than the 

 basal part; anterior femora with a pair of bristles below the base, 

 hind trochanters armed as in the male; claws and pulvilli larger than 

 in the male. 



Length 2,8 to fiilly 3 mm. 



P. sijlvaticus is not rare in Denmark, Amager, Charlottenlund 

 (Stæger), Dyrehaven, Ruderhegn, Vemmetofte (H, J. Hansen), Nord- 

 skoven at Jægerspris (Schlick), Hillerød, Lolials on Langeland (the 

 author), on Lolland at Lysemose (Schlick), on Falster, on Funen at 

 Veflinge, in Jutland in Grejsdal at Vejle, Nebsager near Horsens, 

 Frijsenborg, Laven, Hald and Sæby (H. J. Hansen, the author); the 

 dates are ^Vs into August. I have seen the species in Zetterstedt's 

 collection, it is identical with the present. 



Geographical distribution: — Northern and middle Europe 

 down into France and on the Canaries, towards the north to northern 

 Sweden. 



25. P. nigritulus Zett. 



1844. Zett. Dipt. Scand. III, 957, 10 et 1849. VIII, 3206, 10 et 1852. 

 XI, 4312, 10 et 1859. XIII, 6059, 10. — 1887. Kow. Wien. Ent. Zeitg. VI, 

 153, 16. — 1897. Beck. Beil. Entom. Zeitsclir. XLII, 84, 41, Taf. II, Fig. 10 

 et 1900. XLV, 238, 41. — 1920. CoUin, Ent. Month. Mag. LVI, 274, 6. - 

 P.geniculatus Verr. 1901. Brit. Flies VIII, 120, 25, figs. 114-115, p.p. - 

 1921. Beck. Wien. Ent. Zeitg. XXXVIII, 160, 162. — Dorylas geniculatus 

 1910. Kertész, Cat. Dipt. VII, 374 p. p. 



Male. Eyes touching, vertex black, frons white or whitish yellow, 

 about as high as the eye-suture; epistoma white. Occiput whitish 

 grey below, black and shining in the upper half. Antennæ with the 

 third joint brown or blackish brown, whitish pruinose, moderately 

 rostrate. Thorax brownish black, dull, a little shining behind and 

 scutellum shining; humeral knob pale yellow; the disc with fine 

 dark hairs as dorsocentral rows and about the humeri, and the hairs 

 at the margin of scutellum short and little conspicuous. Pleura black 

 and shining in front, more pruinose behind, postscutellum black and 



