Cystogaster. 109 



1. C. globosa Fabr. 



1775. Fabr. Syst. Entom. 770, 4 (Musca) et 1805. Syst. Antl. 311, 13 

 (Tachina). — 1824. Meig. Syst. Beschr. IV, 206, 3, Tab. XXXIX, Fig. 22 

 {Gymnosoma) et 1838. VII, Tab. LXIX, Fig. 25— 29. — 1844. Zett. Dipt. 

 Scand. III, 1228, 1. — 1862. Schin. F. A. I, 411. — 1889. B. B. Denschr. Akad. 

 Wiss. Wien, LVI, 148. — 1894. Pand. Rev. Entom. XIII, 82, 3 {Gijmnosoma). 

 — 1907. Kat. palåarkt. Dipt. III, 567. — 1921. Baer, Zeitschr. f. angew. Entom. 

 VII, 393. — 1924. Stein, Arch. f. Naturgesch. 90, 6, 255. — Gymnosoma dispar 

 Fall. 1820. Dipt. Suec. Rhizom. 9, 2. 



Male. This species is so highly similar to G. rotundatum that 

 I shall give only the differences. Frons above about as broad as the 

 eye, widening downwards. Frontal stripe velvet black or brownish 

 black. Antennæ short, third joint slightly longer than second; arista 

 short-pubescent. Palpi yellow to brown. The stripes on front part 

 of thorax very slightly pronounced. Sciitelhim not pale at apex. 

 Abdomen yellowish red with base and apex black and a black spot 

 on third segment or a continiious middle line; the black apical part 

 includes fifth segment quite and generally more or less of the sides 

 of fourth except the lateral margin. W^ings less tinged, with first 

 posterior cell longer petiolate, the pedimcle ending at apex of wing. 



Female. Of a somewhat different aspect on account of the 

 colour. Frons of about the same breadth as in male; orbits black 

 and shining only on upper half. Thorax quite black and shining, 

 only pruinose on humeri and sides. Abdomen quite black both above 

 and below. 



Length 3,5 — 5 mm. 



C. globosa is rare in Denmark; Lundtofte, Søllerød, Ruderhegn, 

 Ryget Skov (Kryger); the dates are ^^/^ — -"/g. Its biology is treated 

 by Nielsen (Vidensk. Medd. fra Dansk. Nat. Foren. 67, 1916, 14); 

 he got it bred from Aelia acuminata^ taken in June and the beginning 

 of July. The eggs are deposited in a number of 1 — 3 on the dorsum 

 of abdomen near the sides. The fullgrown larva bores out and pupates 

 in the ground, and the imago develops after about 14 days; the 

 imago deposites again, and in August fullgrown larvæ may be found 

 once more in the Aelia. 



Geographical distribution: — Europe; towards the north to 

 middle Sweden, and in Finland. 



