Tachina. 383 



with first posterior cell narrowly open in considerable distance from 

 apex of wing, discai angle rectangiilar, the vein prolonged beyond 

 it as a veinlet or fiirrow aboiit half way to margin ; apical cross- vein 

 curved above the angle, then straight and sloping; a not large costal 

 spine. 



The species are parasitic on varioiis Lepidoptera and on some 

 Tenthredinids, some of them, especially larvarum very polyphagoiis. 

 They belong to Pantel's group 1, and the larva gets the air through 

 a primary hole. 



Of the genus 27 species are recorded in Kat. palåarkt. Dipt., 

 but many of them uncertain. Further there is a large number which 

 cannot be interpreted or even with certainty placed in the genus. 

 Three (or only two) occur in Denmark. 



I have kept the name Tachina., so long in use, for the present 

 genus, but strictly Exorista Meig. 1803, with the type larvarum should 

 replace it, while Tachina should replace Echinomyia. 



Table of Species. 



1. Four postsutural dorsocentral bristles; abdomen with only 

 marginal bristles; scutellum more or less red {Tachina s. str.) 2. 



— Three postsutural dorsocentral bristles; abdomen as a rule 

 with also discai bristles; scutellum not red {Chaetotachina 



B. B.) 3. rustica. 



2. Vibrissæ not ascending to frontal bristles; eyes practically 



bare; pruinose bands on abdomen broad 1. larvarum. 



— Vibrissæ ascending to or above lowermost frontal bristle, and 

 more numerous; eyes a little pubescent; pruinose bands on 

 abdomen less broad 2. fasciata. 



1. T. larvarum L. 



1758. Linn. Syst. Nat. X, .596 et 1767. XII, 2, 992 (Musca). — ?1764. 



0. F. MuU. Fn. Fridrichsd. 736 (Musca). — 1805. Fabr. Syst. Antl. 300, 81 

 (Musca). — 1824. Meig. Syst. Beschr. IV, 295, 100 et 1838. VII, 190, 19. — 

 1889. B. B. Denkschr. Akad. Wiss. Wien, LVI, 98, Tab. IV, Fig. 64 (Eutachina). 



— 1907. Kat. palåarkt. Dipt. III, 335. -~ 1921. Baer, Zeitschr. f. angew. Ent. 

 VII, 355. — 1924. Stein, Arch. f. Naturgesch. 90, 6, 114, 2. — T. vidua Meig. 

 1824. 1. c. IV, 315, 131 et 1838. VII, 190, 28. — 1862. Schin. F. A. I, 474. — 

 T. flavesceyis Meig. 1824. 1. c. IV, 294, 98 et 1838. VII, 190, 2. —1844. Zett. 



1. c. III, 1014, 2. 



Male. Frons above a little narrower than the eye or about as 

 broad. Orbits yellowish, darkest above; cheeks paler yellowish or 

 white and silvery; jowls greyish. Frontal stripe narrower than orbits, 



