214 Descriptions of British Diptera. 



CONOPS VESICULARIS. 

 Linn. Fabr. Meigen, iv. 209 — Conops cylindrica g. Meig. Klass. 



Hypostome ferruginous, the eyes bordered with a bright yellow 

 line : forehead ferruginous anteriorly with a black longitudinal line 

 widened at the lower extremity ; the vertex brown and transparent ; 

 antennae ferruginous ; thorax dark-brown, the shoulders and seutel- 

 lum testaceous : abdomen in the male nearly cylindrical, the two 

 first segments black, narrowly edged with fulvous, the third with a 

 fulvous band becoming yellow on the sides, fourth fulvous, black at 

 the base ; the two last entirely fulvous ; abdomen of the female con- 

 tracted at the base, ferruginous, the first segment brown with a ful- 

 vous line, second brown with a yellow band behind, the third black 

 at its anterior edge : legs ferruginous : wings reddish brown at the 

 exterior edge, and pale towards the extremity. 6-7 lines, 



A scarce species ; it has occurred near London and in a few other 

 places. " I have taken the male in the New Forest, and on Knight- 

 on Heath, Dorset,— dates May 22, 1835, and June 10, 1829." J. 

 C. Dale, Esq. 



Conops flavipes. (s.) 



Linn. Fab. Panzer. Faun. Germ. lxx, fig. 21, 22 Meigeiij iv. 122. — Conops 



macrocephala, Samouelle's Comp. pi. ix. fig. 9 Conops vesicularis, Harris, 



Expos- pi. xx. fig. 1 — Conops trifasciata, De Geer. <%. 



Head fulvous, with a brownish transparent vertex, from which a 

 broad black band extends to the base of the antennae, the latter 

 black ; thorax black with a yellow callosity on each shoulder, and 

 another on each side of the metathorax ; scutellum bordered with 

 yellow : abdomen a little contracted at the base, black, the second 

 and third segments in the male, and the second, third, and fourth 

 in the female, with a yellow posterior band ; the first in both sexes, 

 with a yellow spot on each side, and the two anal segments ash-grey 

 inclining slightly to yellow : halteres yellow, legs also of that colour, 

 the posterior half of the thighs black, and the tarsi brown at the 

 apex : wings tinged with brown, deepest at the outer margin. 5 

 lines. (Wood- cut, Jig. 5. J 



This is the most plentiful species of this tribe in Britain. It 

 seems to occur in all parts of England, is rather plentiful in the 

 south of Scotland, and has been traced as far north as Aberdeen- 

 shire. In Scotland it seldom appears before August, and is then 

 usually observed on the common ragwort (Senecio Jacobaza,) but in 

 the more southern parts of the island it may be found much earlier. 

 It varies a little particularly in the breadth of the abdominal 



