42 Orthorrliapha lnachycera. 



hot days in sun-shine they niay become more active. Of the genus 

 49 species are known trom tiie palæarctic region, most of wliich are 

 soutiiern species, 4 species have hitherto been found in Deninari<. 



Table of Species. 



1. Abdomenwithyellow spots: eyes bare oronlyhairy inthe male. ... 2. 



— Abdomen quite black ; eyes hairy in botli sexes 1 . longicornis. 



2. Venter yellow wjth black, transverse bands or spots; eyes 



bare in botli sexes 3. 



— Venter black witli yellow transverse bands; eyes hairy in 



the male, bare in the female 2. furcata. 



3. Abdomen with three pairs of rather broad, yellow side spots 3. chamæleon. 



— Abdomen with the third and second pair of side spots 

 narrow and both, or only the third pair, united to a 



narrow band 4. potamida. 



1. S. longicornis Scop. 

 1763. Hirtea, Scop. Entom. Garn. 307,999. — 1862. Strut iotiu/s, Schin. 

 F. A. I, 15. — 1903. Hirtea, Kat. palåarkt. Dipt. Il, 16.— 1781. Stratiomys 

 striyata, Fabr. Spec. Ins. 11. 417. 4. — 1842. Stratiomys strigata, Zelt. Dipt. 

 Scand. I, 135. 3. 



Male. Eyes with long, biackish brown liairs. upper facets larger 

 tlian thelower, the dividing line not especially shar)); the eyes greenisli. 

 with the upper and lower part and a band below the niiddie, dark l)iuish, 

 the bluish colour thus being extended to such a degree tliat the eyes 

 may be described as l)luish with two greenish bands. Face black. at 

 the inner eye-niargin a faint yellowish slripe: all the face clothed witli 

 long, yellowish pubescence. Antennæ ])iack. Thorax black with long, 

 yellowish red pubescence. below the puliescence is somewhat paler. 

 Scutelluni black, the spines, and sometimes a narrow margin between 

 theni, yellow. Abdomen black. with long but not dense, yellowish red 

 pubescence. this being more dense on the side parts of the hind 

 margins of the second, third and fourth segments, and thus, there. 

 formiiig more or less distinct spots, most distinct on the second segment: 

 the markings are sometimes very indistinct. Venter black with a small 

 basal spol and the hind margins of the segments pale, broadest on 

 the flrst segment and decreasing in breadth backwards; pubescence 

 long, yellowish. Legs black. the extreme tips of the femora yellow; 

 the hind tibiæ yellowish to brownish; the tarsi yellowish. darkened 

 towards the ends. Legs densely clothed with greyish yellow pubescence. 

 Wings with a distinct brownish tinge, most distinct on the middle and 

 thus forming somewhat of a spot. the apex (juite white and hyaline: 

 the veins brownish. Ilalteres white with a darker pedunde. 



Female. Eyes as densely hairy as in the male, similarly coloured. 

 but with tlio bluisli middle band a litlle above the middle. Face 



