96 Orthonhapliii biachyceia. 



witli distiiict Iriangle-shaped spots. Venler witli first and second seg- 

 ment quite yellow; the yellow pubescence on abdomen niuch more 

 extended than in the male. Legs with the posterior tibiæ and base 

 of tarsi yellowish, the apex of the posterior femora and the base of 

 the front tibiæ are aiso often of the same coiour. 



Length 9 — 10,6 mm. 



The pupa has a length of 12 mm. 



This species somewhat resembles C. relidus. but may easily be 

 distinguished by the spot on the second abdominal segment not being 

 excised on the hind margin. 



C. quadratus is not uncommon. and it occurs in nearly all parts 

 of Denmark; Ermelund, Furesø, Hillerød, Frerslev Hegn, Tiissø, Gurrcsø. 

 Teglstrup Hegn; Funen at Faaborg; Jutland at Vejle, Silkeborg and 

 Frijsenborg and on Bornholm in Ekkodalen. It occurs especially near 

 water. I iiave seen il attack goats. I have records of it from '•'*/(i to 

 ''/8. A pupa found - e developod '"/i;. The pupæ are found in moist 

 sand near water. 



Geographical distribution: — The species is distributed all over 

 Europe to northern Italy. 



4. C. relictus Meig. 



1820. Meig. Syst. Beschr. II, 69, 3. — 1842. Zett. Dipt. Scand. 1, 124, 2. 

 — 1858. Low, Verh. zool. bot. Gesell. VIII. 627, 15. — 1862. Scliin. F. A. 

 I, 42. — 1903. Kat. palaarkt. Dipt. II, 49. 



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

 facets reaching soine way up along tho hind margin: tho dividing 

 line sharj). The l'acial calli moderateiy large, those on the yowls 

 small, both widely separated. Antennæ black, first joint often yellow 

 below on tho inner side, the first two joints long haired. Second joint 

 of palpi dark brown, rather long. Thorax dark brown, with two, 

 often indistinct, broad, approximate greenish grey lines and the margin 

 of the same coiour; phnn'a and sterna greenish grey pruinose. Pubescence 

 blackish brown to yellow. Abdomen black; the sides of the three 

 first segments yellow, leaving on the second segment a broad black 

 spot. which is rather deeply incised on the hind margin; the following 

 segments with undulated, yellow hind margins which are especially 

 widened at the sides and as triangles in the middle. Venter with the 

 two flrst segments yellow with black spots in the middle, the following 

 segments blackish with broad yellow hind margins. Pubescence black 

 and yellow, the yellow hairs especially ])laced at the hind margins of 

 the segments; on the dorsal side the pubescence may be nearly quite 

 black. Legs black; posterior tibiæ and basal half of front tibiæ yellow: 



