Empididae. 249 



are two claws, two small pulvilli and a small, linear empodium with 

 bristles. The wings also are in venation and shape like those in 

 Chelipoda, but a discai cell is present. No stigma. Alar squamula 

 very narrow, with long hairs at the margin. 



The developmental stages are not known. 



The small species of this genus occur in woods on bushes and 

 in low herbage on humid piaces. 



Of the genus 3 species occur in the palæarctic region, but one of 

 them {suppUcatoria Meig.) is doubtful ; two are found in Denmark. 



Table of Species. 



1. Thorax mainly yellow; a pair of distinct bristles on the 

 middle of the disc ; male genitalia large, reaching in over 

 abdomen beyond the middle; female ovipositor with short, 

 indistinct styles 1 . vocatoria. 



— Thorax mainly grey; no pair of distinct bristles on the 

 middle of the disc; male genitalia smaller; female ovipositor 

 with two distinct styles 2. albiseta. 



1. Ph. vocatoria Fah. 



1815. Fall. Dipt. Suec. Empid. 12, 15 (Tachydromia). — 1842. Zett. 

 Dipt. Scand. I, 270, 2. — 1903. Kat. palåarkt. Dipt. 11, 271. 



Male. Frons and vertex grey, the ocellar tubercle blackish; 

 epistoma white; palpi yellowish. Occiput grey, darker behind, with 

 black bristles above and somewhat long, whitish hairs below. Antennæ 

 yellow, the third joint often darker, arista pale yellowish. Thorax 

 yellow or reddish yellow, distinctly greyish pruinose, with a dark 

 middle stripe, which is broadest in front, and often indistinct behind. 

 Dorsocentral bristles two in each row, long, black. A notopleural 

 and a supraalar bristle present, both black. Scutellum with two 

 black marginal bristles. Pleura yellow, somewhat pruinose. Abdomen 

 is brownish or blackish grey above, with yellowish hairs. Venter 

 yehow. The exterior genitalia are yellow, very large, reaching for- 

 wards beyond the middle of abdomen. Legs yellow, the last tarsal 

 joint brownish or blackish. The legs short-haired with yellowish 

 hairs, longest on the hind tibiæ; the front femora with two rows of 

 strong, blackish bristles below. Wings hyaline, slightly yehowish. 

 Veins brownish. Halteres yellow. 



Female. Quite similar to the male; the ovipositor without distinct 

 styles. 



Length 2 — 2,3 mm. 



Fh. vocatoria is not rare in Denmark ; Charlottenlund, Bøllemosen, 

 Ørholm, Svenstrup between Roskilde and Ringsted, and Tisvilde; on 



