474 



Tachinidae. 



and emerged in February (in a warm room); otherwige no host seems 

 to be known (see under cristata). 



Geographical distribution: — Northern and middle Europe; 

 not known north of Denmark. 



3. B. geniculata De G. 



1776. De G. Mém. Ins. VI, 20, 15, Tab. II, Fig. 19—23 {Musca). — 1844. 

 Zett. Dipt. Scand. III, 989, 1, p. p. et 1859. XIII, 6064, 1 (Siphona). — 1849. 

 Stæg. apud. Zett. Dipt. Scand. VIII, 3210, 1 {Siphona). — 1862. Schin. F. A. I, 

 521 {Siphona). — 1894. Pand. Rev. Entom. XIII, 108, 2 {Siphona). — 1907. 

 Kat. palåarkt. Dipt. III, 381. — 1921. Baer, Zeitschr. f. angew. Ent. VII, 

 369. — 1924. Stein, Arch. f. Naturgesch. 90, 6, 127, 2, p. p. — Stomoxys minuta 

 Fabr. 1805. Syst. Antl. 282, 17. — 1849. Stæg. apud Zett. ]. c. VIII, 3211, 3 

 {Siphona). — 1894. Pand. 1. c. XIII, 108, 5 {Siphona). — S. nigrovittata Meig. 

 1824. Syst. Beschr. IV, 157, 4. 



Male. Similar to the other species, but the head longer and less 

 high, the eyes reaching just to the large vibrissa; jowls a little broader 



than in cristata. Orbits greyish; 

 cheeks generally hairy to the 

 middle or below. Antennæ not 

 large, third joint scarcely thrice 

 as long as second. Thorax greyish 

 pruinose, and there seems always 

 to be four postsutural dorsocen- 

 trals. Abdomen greyish or brown- 

 ish grey, as a rule yellowish at the 

 sides of second and third segment, 

 but sometimes very slightly yel- 

 lowish or quite grey; there is a 

 pair of marginal bristles on second 

 segment. Legs yellow, sometimes 

 somewhat darkened towards black- 

 ish, especially femora; tarsi black. 

 Female. Similar; antennæ mth 



Fig. 100. Head of B. geniculata (J , 



third joint smaller. Abdomen quite grey. 



Length 4 — 5,5 mm. 



Remarks : The species varies, as seen, somewhat in colour and in 

 size, the smallest and darkest specimens forming the species minuta 

 by Stæger. 



B. geniculata is common in Denmark; Utterslev Mose, Amager, 

 Gentofte, Charlottenlund, Ordrup Mose, Dyrehaven, Fure Sø, Geel 



