ORTALlD.-^-STENOPTERIN T A. 97 



S. xnea Wied. and brevipes F. may be considered as the 

 types of the genus. 



1. S CJBrulescens n. sp. %, . Viridi-chalybea, humeris concolori- 

 bus, thoracis dorso magis violaceo, halteribus nigris, alarum hyalinarum 

 limbo costali inde a venae auxiliaris apice usque ad venam quartam 

 pertinente, cellula basali prima et veuae trausversalis posterioris limbo 

 fusco-nigris. 



Greenish-steelblue, with conooloroua humeri and the thoracic dorsnm 

 more violet; halteres black; wings hyaliue, a costal border, reaching 

 from the end of the auxiliary to the end of the fourth longitudinal 

 vein, the first basal cell and a border along the posterior crossvein 

 brownish-black. Long. corp. 0.320.39 ; long. al. 0.260.31. 



Of a greenish-steelblue coloring, which on the abdomen has a 

 somewhat stronger admixture of green and verges on violet on 

 the thoracic dorsum ; the humeral callosities and the pleurae 

 have the same greenish-blue color. Head dark-yellow, almost 

 brownish-yellow ; clypeus and palpi of the same color ; front 

 strongly infuscated anteriorly, this coloring having more or less 

 extent ; at the bottom of each of the foveae a distinct brownish- 

 black longitudinal streak ; first and second antennal joints, as 

 well as the root of the third, to a greater or lesser extent, dark- 

 yellow ; the third joint, towards its end, becomes more and more 

 brown, even brownish-black. The last abdominal segment is 

 only a little shorter than the penultimate. The hairs on thorax 

 and abdomen are whitish, with the exception of the few and 

 comparatively short bristles on the posterior end of the thoracic 

 dorsum and of the four bristles of the scutellum. The coloring 

 of the coxae and feet is very variable, as that of the front and 

 of the antennae ; the palest specimens in my possession have 

 brownish-yellow coxae, more yello\vish feet, with a dark metallic 

 streak, reflecting greenish-blue, upon the anterior side of the 

 hind femora, and with tarsi which are dark-brown towards the 

 tip ; the darkest specimens in my collection have metallic-black 

 coxae, the femora almost black, with a bright metallic bluish- 

 green lustre, excepting the tips of all the femora, which are 

 brownish-red, and of the brownish-red basis of the middle ones ; 

 tibiae and tarsi dark brownish-red ; the latter, towards their end, 

 colored with brownish-black to a considerable extent. Halteres 

 black, only the basis of their stem a little paler. Wings hyaline; 

 t 



