116 Orthorrhapha brachycera. 



The pupa has a length of 20 mm. 



This species differs from mnntanus chiefly by the shape of the 

 palpi in both sexes, and in the feniale by the distint-tly higher frontal 

 band; the coloration of the venter is also rather characteristic for 

 the males in the two species, viz. a quadratic spot on the second 

 segment in montaxus and a sliort triangle at the base in tropicus. 



T. tropicus is not uncommon in Denmark ; vicinity of Copenhagen, 

 Utterslev Mose, Ruderiiegn, Hillerød, Frerslev Hegn, Tidsvilde and 

 Boserup at Roskilde; Funen at Odense and Jutland at Silkeborg. It 

 has been taken from '"/g — '-'h. A pupa was taken in moss in Lyngby 

 Mose on ■"',ii and developed '•' n. The dark form of the female seems 

 to be the most comnion liere. 



Geographical distribution : — Northern and middle Europe to 

 northern France; and in Siberia. 



3. T. luridus Fall. 



1817. Fall. Dipl. suec. 5, 4. — 1842. Zett. Dipt. Scand. I, 112, 11. 

 — 1862. Schin. F. A. 1, 31. p.p. — 1880. Brauer, Denkschr. kais. Akad. 

 Wissensch. Wien, XLII, 148, 10, Tab. I et V, Fig. 10. — 1903. Kat. pala- 

 aikt. Dipt. II, 66. 



Male. Eyes densely covered with rather long brownish hairs, 

 green, with three bands and the lower margin red ; eye-facets practi- 

 cally of equal size. Head low; the eye-suture not much longer than 

 the frontal triangle. Front and cheeks grey, the latter with black 

 hairs, paler on the yowls. Antennæ reddish, the two basal joints 

 dark grey, style dark brown, third joint somewhat dilated, with a 

 rather deep excision. The palpi (Fig. 35) yellow, second joint thickened, 

 short ovate, with long, whitish and black hairs. Tliorax blackish 

 brown, with faint traces of stripes, clothed with blackish brown hairs; 

 on pleura and sterna the hairs are pale; on the disc there are some 

 yellowish golden hairs. Præalar cailus reddish brown to black. Ab- 

 domen brownish red, first segment black, second and third with a 

 black middle line, occupying a third of the breadth; the four last 

 segments black. The dorsal line is narrowest on the third and the 

 last half of the second segment. Venter brownish red, first segment 

 black, second with a quadratic or triangular. sometimes indistinct. 

 spot, third or third and fourth segments red, the foUowing black. 

 Abdomen clothed with black and pale hairs in the ordinary way, the 

 pale hairs forming more or less distinct, but small and sometimes 

 inconspicuous triangles on the dorsal middle line. If viewed from 

 bel lind the usual silvergrey pruinosity is generally seen. Legs with 

 the femora black; tibiæ dark reddish, front tibiæ with the apical half. 



