278 Orthorrhapha brachycera. 



Thorax green or bluish green, somewhat greyish pruinose, shining; 

 acrostichal bristles practically uniserial, a little irregular. Pleura green, 

 grey pruinose ; propleural hairs white. Abdomen green, sometimes 

 somewhat æneous; the second and third segments generally more or 

 less yellow and either quite or almost quite yellow, or with larger 

 or smaller side spots, or sometimes without spots; abdomen clothed 

 with short, black hairs, at the sides there are pale hairs, and there 

 are hindmarginal bristles, long on the first segment. Venter greenish, 

 grey pruinose, more or less yellow at the base in accordance with 

 the colour of the dorsal side; it has pale hairs. Legs with the front 

 coxæ yellow, greenish grey at the very base; posterior coxæ grey; 

 for the rest the legs yellow but somewhat varying; either femora and 

 tibiæ quite yellow, anterior tarsi black from the apex of metatarsus, 

 and hind tarsi black with the base of metatarsus yellow; or the 

 hind femora and tibiæ are more or less broadly black at the apex, 

 and the hind tarsi quite black; also the anterior tarsi are then more 

 black with only the base pale, or middle tarsi quite black and even 

 the apex of the middle tibiæ brow^nish; the dark-legged specimens 

 have generally abdomen without yellow colour, they are thus upon 

 the whole darker, also their legs are more strongly bristly, and they 

 seem upon the whole to be more robust, but all intermediates are 

 present; the hind metatarsus is of the length of the second joint. 

 The legs have short, black hairs; coxæ white-haired, hind coxæ with 

 a black bristle on the outside; posterior femora with a preapical 

 bristle ; front tibiæ generally with a small bristle above near the base, 

 middle tibiæ with three antero- and two postero-dorsal bristles, and 

 sometimes with one ventral bristle; hind tibiæ with two dorsal rows 

 and some ventral bristles, and besides with a row of somewhat (more 

 or less) long, bristly hairs on the anterior side, and with shorter, 

 somewhat bristly hairs above and below; hind tarsi with a short 

 ciliaiion on the anterior side, longest on metatarsus, and this latter 



Fig. 86. Antenna of S.pallipes 9, from the inside. X 75. 



excised below at the base and above the excision with a strong, 

 curved, bifid spine. Wings more or less brownish, sometimes almost 

 blackish tinged towards the anterior margin, sometimes almost hyaline; 

 veins black, discai vein with a very slight bend quite near the posterior 



