Tabanidae. . 95 



to be rare here, I only know it from Lersø, collected in earlier times 

 but not more recentiy. 



Geographical distribution: — Northern and middle Europe; perhaps 

 also in North America (see Osten Saciien, Mem. Bost. Soc. of Nat. Hist. 

 II, P. IV, 1875, 395.) 



3. C. quadratus Meig. 



1820. Meig. Sysl. Besclir. II, 70, 5, $. — 1842. Zett. Dipt. Scand. 1, 

 125, 5. — 1858. Low, Verh. zool. bot. Geseli. VIII, 626, 14. — 1862. 

 Schin. F. A. I, 41. — 1903. Kat. palaarkt. Dipt. II, 48. — 1820. C. pictus 

 Meig. Sysl. Beschr. II, 70, 4, % 



Male. Eye-facets in the upper two thirds larger than below, the 

 dividing line sharp ; the small facets stretching up some way along the 

 hind margin. The black calli on the face rather large, those on the 

 yowls smaller, the caili separated by a yeliow pruinose band. Antennæ 

 black; the two first joints with long, black hairs. The second joint 

 of the paipi blackish, long, considerably longer than in the two pre- 

 ceding species. Thorax dark brownish. with two broad, approximate, 

 greenish grey lines, and the margin of the same colour; pubescence 

 yellowish brown or yellowish, especially a distinct yeliow tuft in front 

 of the wing-root; the pleura often more or less black haired. Abdomen 

 black; the first, second and third segments yeliow at the sides, and 

 the second segment with a yeliow hind margin, hence in the middle 

 of this segment a transverse or somewhat quadratic black spot, con- 

 nected with the black first segment, the spot is not excised on the 

 hind margin ; the following segments also with yeliow, somewhat 

 undulated hind margins; when the light falls from behind the hind 

 margins shine greyish and show indistinct middle triangles. The venter 

 is yeliow with a middle line and last segments black. Abdomen is 

 clothed with black and a few yeliow hairs, the latter especially found 

 in the dorsal middle line and at the hind margins of the ventral 

 segments. Legs black; the middle tibiæ and the posterior tarsi except 

 towards the tips yeliow; the hind tibiæ with a distinct ciliation. Wings 

 with the hyaline parts somewhat yellowisli. Balteres brownish, the 

 knob black. 



Female. Frontal cailus large, produced upwards in a point. The 

 two basal joints of the antennæ and the base of the third joint 

 generally yellowish. Second joint of palpi brown, rather long. Thorax 

 brighter yeliow haired than in the male. Abdomen as in the male, 

 but the yeliow colour more extended and thus the second segment 

 ((uite yeliow, with a small roundish or subquadratic spot in the 

 middle, and the following segments besides the pale undulated margins 



