1892.] 38 



from the fronto-orbital ones ; the arista is thickened for a longer distance, and in my 

 specimen the cubital appendix on the wings is very long and distinct, being true, 

 and not spurious. Kondani says that this species is \ery variable, and has been 

 described by Macquart under several different names, as 2\ angusla, T. angusti- 

 fasclata, T. Jlavicaliptrata, T. cceler, and T. pusilla. 



T. akgelicj:, INIgn. 



Forehead prominent, frontal stripe equal in width to the sides of the frontalia, 

 piceous or black, with grey reflections ; fronto-orbital bristles extending half way 

 down the face ; facialia almost bare, there being only a few sliort sctte placed above 

 the vibrissa? ; face white, with black reflections ; antenna; with the third joint about 

 twice the length of the second in the male, and about one and a lialf times in the 

 female ; palpi rufous ; thorax glabrous, blue-black, with white patches and reflections, 

 marked with four narrow stripes, the middle pair of which are nearer to each other 

 than to the lateral ones, and liaving four outer dorso-eentral setse behind the trans- 

 verse groove ; scutellum blue-black ; abdomen elliptical, the first ring black, the 

 front halves of the other rings glistening bluish-white, and the hinder halves sur- 

 rounded by a shining black band ; there is also a narrow, black, dorsal, longitudinal 

 stripe, and seta; both on the disc and edges of the segments ; the ventral surface is 

 shiny black ; wings brownish, with straight apical and outer cross veins, and a small 

 costal spine. Rare ; in Mr. Dale's collection. 



T. BBEVIPENNIS, Mgtl. 



Head with forehead prominent, the eyes widely separated in the female, with the 

 central stripe wider than the sides of the frontalia ; face white, with black reflections ; 

 antennte grey, with the third joint a little longer than the second ; fronto-orbital 

 bristles extending to the end of the second antennal joint, where they spread out 

 into an irregular patch ; facialia almost bare ; palpi black ;* tliorax blue-black, 

 covered with grey pubescence, marked with four moderately wide stripes, and having 

 four external dorso-eentral setse behind the groove ; scutellum black ; abdomen eon- 

 vex, shiny black, with the first ring quite black, and the others encircled with a 

 narrow white ring on their front margins, and having seta; both on the disc and 

 edges ; wings greyish, with straight cross veins, and a short and rather indistinct 

 spurious cubital appendix. 



I have only seen one female specimen of this rare species, which I captured 

 near Buckingham in 1873. 



T. JitOROSA, Mgll. 



Head with the eyes a good deal wider apart in tlie females than in the males, 

 frontal stripe wider than the sides of the frontalia in the latter, and equal in width 

 in the former, in which sex the sides are shining black ; antennie gYcy, with the third 

 joint about twice the length of the second in the male, and ratiier shorter in the 

 female ; arista with the basal half strongly thickened ; palpi black, with the tips 

 pale in some specimens ; fronto-orbital bristles reaching the middle of the face ; 

 facialia almost bare ; thorax blue-black, with front and sides grey, and marked with 

 four narrow black stripes ; scutellum grey ; abdomen shining blue-black, marked in 



* The points are picoovis in my specimen. 



