Trigonospila. 557 



postsutural acrostichals; no præsutural intraalar bristle; one post- 

 humeral bristle. Scutellum with two marginal bristles on each side 

 and generally a small hair-like bristle between them; the apical 

 bristles diverging. Three sternopleural bristles. Pteropleura above 

 with a few hairs and a small bristle. Abdomen elongated, cylindrical, 

 the foiir last segments of about equal length; excavation on second 

 segment small, only reaching half way to the margin; there are discai 

 and marginal bristles, on second segment a pair of marginal. Legs 

 long and slender, with moderate bristles; front tibiæ with one or two 

 posterior bristles; middle tibiæ without ventral bristle in both sexes; 

 claws and pulvilli in male elongated. Wings with first posterior cell 

 open, ending about at apex of wing; discai angle rounded; posterior 

 cross-vein at the beginning of last third between medial cross-vein 

 and angle; no costal spine. 



Of the genus only one species is known, also occurring in Den- 

 mark. 



1. T. ludio Zett. 



1848. Zett. Dipt. Seand. VIII, 3233, 51—52 {Tachina). — 1907. Kat. 

 palåarkt. Dipt. III, 352 {Tachina). — 1924. Stein, Arcli. f. Naturgesch. 90, 6, 

 150 {ludis). — Tr. picta Pok. 1886. Wien Ent. Zeitg. V, 191, 1. — 1889. B. B. 

 Denksclir. Akad. Wiss. Wien, LVI, Tab. VIII, Fig. 209. — 1907. Kat. palåarkt. 

 Dipt. III, 401. 



Male. Frons above narrow, and likewise cheeks and jowls narrow. 

 Head silvery; frontal stripe velvet black. Orbits and cheeks bare 

 and also jowls without hairs. Occiput grey, blackish above, silvery 

 along the eyes; it is pale-haired below, black-haired above. Antennæ 

 blackish or brown, a little greyish; arista long, thickened in about 

 basal third, distinctly pubescent. Palpi thin, blackish or brownish, 

 palest at base. Thorax whitish or almost silvery pruinose, behind 

 the suture a black transverse spot or band; it has two velvet black 

 narrow median stripes, diverging and abbreviated behind, and on 

 each side a cuneiforme stripe abbreviated in front and behind and 

 here pointed, interrupted at the suture. Scutellum black with apex 

 grey. Thorax is very sparingly haired, nearly bare; scutellum with 

 a pair of discai bristles. Abdomen brownish black, the three last 

 segments with a broad, greyish white pruinose front band, more or 

 less incised in the middle behind, the band is narrowest on third 

 segment, broader on fourth and here occupying about the front 

 half or more, and still broader on fifth segment, which has only apex 



