Rhynchista. 521 



ginal bristles on each side, the apical somewhat small, crossing. 

 Three sternopleural bristles. Pteropleura above with a biindle of 

 small hairs and a bristle. Abdomen elongated conical; excavation 

 on second segment reaching hind margin; there are discai and mar- 

 ginal bristles, second segment without bristles; fifth qiiite covered 

 with bristles. Genitalia not large; fifth sternite cleft to near base. 

 Legs long, with long bristles and front tibiæ with an anterodorsal 

 row of rather long bristles. Claws and pulvilli in male strongly elong- 

 ated. Wings with first posterior cell open, ending somewhat before 

 apex of wing; discai angle obtuse; one of the bristles at base of cubital 

 vein somewhat strong; a strong costal spine present. 



The sole species of the genus is known as parasite on Pyrausta 

 porphijralis. 



Only one species is known, also occurring in Denmark. 



1. R. prolixa Meig. 



1824. Meig. Syst. Beschr. IV, 363, 214 {Tachina) et 1838. VII, 229, 13 

 {Macquartia). — 1844. Zett. Dipt. Scand. III, 1185, 188 et 1859. XIII, 6143, 

 188 (Tachina). — 1862. Schin. F. A. I, 532 {Macquartia). — 1889. B. B. Denk- 

 schr. Akad. Wiss. Wien, LVI, 135, Tab. X, Fig. 258 et 1891. LVIII, 384. — 1896. 

 Pand. Kev. Entom. XV, 39 {Erigone). — 1907. Kat. palåarkt. Dipt. III, 424. 

 — 1921. Baer, Zeitschr. f. angew. Ent. VII, 376. — 1924. Stein, Arch. f. Natur- 

 gesch. 90, 6, 170, 4 {Eriothrix). — T. spinosa Zett. 1838. Ins. Lapp. 648, 62. — 

 Erigone monticola Pand. (nec Egg.) 1896. Rev. Entom. XV, 39, 15. — 1907. 

 Villen. Ann. Soc. Ent. de Fr. LXXVI, 388. 



Male. Frons above about half as broad as the eye; cheeks broad. 

 Head silvery; frontal stripe velvet black. Eyes brown-hairy. Orbits 

 with some single fine hairs; jowls black-haired. Occiput grey, with 

 pale yellow hairs, and two rows of black hairs behind the strong 

 postocular bristles. Antennæ black; arista thickened at base, distinctly 

 short-haired, Palpi brownish or black. Thorax blackish, greyish 

 pruinose, with four stripes, the median narrow, abbreviated behind, 

 the lateral interrupted at the suture. Thorax black-haired. Abdomen 

 blackish, with not large red side spots; the three last segments grey 

 pruinose, shifting with dark spots according to view; the hind margins 

 and most of fifth segment dark, but along the middle the grey colour 

 forms an uninterupted stripe. Abdomen is black-haired, with strong 

 discai and marginal bristles; second segment without bristles, third 

 with one or two pairs of discai and a pair of marginal, fourth with 

 one or two pairs of discai and a row of marginal bristles. Legs black 

 or tibiæ somewhat brownish, bristles long. Wings somewhat brownish 



