Leptididae. 137 



■^ame branch so that the eggs together with the dead imagines fonn 

 large incrustations, the whole held together by a glue-hke substance. 

 The larvæ live in water. 



The species which are very rare here occiir in the vicinity of 

 water. 



Of the genus 6 species are known from the palæarctic region, 2 

 have been fonnd in Denmark. 



Table of Species. 

 1 . Legs more or less yellow, thorax blackish brown, slightly 



shilling 1 . ibis. 



— Legs black or brown, thorax shining black 2. marginata. 



\. A. ibis Fabr. 



1798. Bhdffio, Fabr. Suppl. Ent. Sysl. 556. c?. — 1805. LejMs. Fabr. 

 Syst. Antl. 70,5. - 1842. Zett. Dipt. Scand. 1,226, Obs. et 1848. ibid. VIII, 

 2990, Obs.— 1862. Schin. F. A. 1, 179.— 1903. Kat. palaarkt. Dipt. II, 77. 



Male. Eyes metaliic green, reddish below; the facets sligthly 

 larger above than below. Front dark grey or greyish brown, cheeks 

 and yowls of the same colour, all cloted with long, brownish hairs. 

 Antennæ greyish black. Thorax blackish brown, slightly shining, with 

 the lateral margin and two longitudinal lines grey. Scutellum blackish 

 brown. Pleura and sterna grey. Thorax clothed with somewhat 

 longish, brownish or greyish hairs; a tuft of hairs on the mesopleura 

 in front of the wing-root. Åbdomen yellowish red, first segment black, 

 on the second, third and fourth a more or less triangular or trans- 

 versely rhoniboidal, black spot in the middle, and small, triangular, 

 black spots at the side margins; the median spot on the second 

 segment is confluent with the black first segment, and sometimes it 

 is produced along the front margin of the segment; on the fifth 

 segment a broad, black, transverse band, widened in the middle, only 

 leaving the front and hind margins narrowly yellow; the apical segments 

 more or less black. Venter yellowish red ; first segment black, second, 

 third and fourth segments with black middle spots, on the following 

 the front margins broadly black. Abdomen clothed with yellow hairs, 

 those situated in the black parts are partly black. Legsrufous; coxæ 

 dark grey; the anterior femora with the base darkened to a higher 

 or lower degree; the tarsi brownish black towards the ends. The 

 legs may vary considerably in colour, some specimens having all the 

 femora nearly quite black, the hind tibiæ black except the base and 

 the hind tarsi quite black. Legs with short, brownish black hairs, 

 on the under side of the anterior femora longer hairs, the hind tibiæ 

 on the outer side with a fringe of not long liairs. Wings hyaline 



