Meigenia. 281 



anterodorsal bristles on hind tibiæ unequal; claws and piilvilli in 

 male somewhat elongated; front tarsi in female simple. Wings with 

 first posterior cell narrowly open or nearly closed, ending a little 

 before apex of wing; discai angle obtuse, apical cross-vein straight; 

 a costal spine absent, or {incana) distinct. 



The species are parasitic almost exclusively on larvæ of Chryso- 

 melids, but have further been bred from a Stenobothrus and from 

 Tenthredinids and are also recorded from Lepidoptera. The species 

 have more than one yearly generation and the development takes 

 relatively short time. In the Chrysomelid larvæ only one parasite 

 develops in the host; the pupation as a rule takes place in the host, 

 rarely in the groimd. They belong to Pantel's group 1, and the larva 

 forms a secondary breathing hole. 



Of the genus three or four European species are known (majus- 

 cula, belonging to the subgenus Mystacella Wulp., with hairy eyes, 

 included). Two occur in Denmark. 



Tahle of Species. 



1. Third antennal joint less than thrice as long as second, not 

 reacliing the large vibrissa ; tliorax in male with three stripes ; 

 abdomen with dark markings ; no costal spine 1 . mutabiUs. 



— Third antennal joint more than thrice as long as second, 

 reaching to about the large vibrissa ; thorax with four stripes ; 

 abdomen grey, without markings; a distinct costal spine . . 2. incana. 



1. M. mutabilis Fall. 



1810. Fall. Vet. Acad. Handl. XXXI, 282 et 1820. Dipt. Suec. Muse. 

 16, 31 {Tachina). — 1824. Meig. Syst. Beschr. IV, 403, 285 {Tachina). — 

 1838. Zett. Ins. Lapp. 638, 19 et 1844. Dipt. Scand. III, 1059, 53 {Tachina). 



— 1896. Pand. Eev. Entom. XV, 49, 2 {Tachina). — 1907. Villen. Ann. Soc. 

 Ent. de Fr. LXXVI, 388. — 1924. Stein, Arch. f. Naturgesch. 90, 6, 113, 3. 



— T. floralis Fall. 1810. 1. c. 282 et 1820. 1. c. 36, 74. — 1824. Meig. 1. c. IV, 

 304, 112. — 1862. Schin. F. A. I, 472. — 1891. B. B. Denkschr. Akad. Wiss. 

 Wien, LVIII, 311. — 1907. Kat. palåarkt. Dipt. III, 323. — 1921. Baer, Zeitschr. 

 f. angew. Ent. VII, 353. — T. bisignata Meig. 1824. 1. c. IV, 322, 143. — 1844. 

 Zett. 1. c. III, 1147, 147. — 1862. Schin. F. A. I, 472. — 1889. B. B. 1. c. LVI, 

 86, Tab. I, Fig. 1 b et 1891. LVIII, 310. — 1907. Kat. palåarkt. Dipt. III, 

 321. — 1921. Baer, 1. c. VII, 354. — T. discolor Zett. 1844. Dipt. Scand. III, 

 1061, 54 et 1849. VIII, 3234, 54. — Microphona minuta B. B. 1891. 1. c. LVIII, 

 355. — 1907. Villen. Wien. Ent. Zeitg. XXV, 249, 3. 



Male. Frons above one third to half as broad as the eye, some- 

 what protruding; cheeks rather broad. Orbits dark greyish, cheeks 



