196 Mr. H. Scott on 



tlie triangles lying along the two sutures. From the sutures 

 to the scutellura the disc is suffused brown-orange, and on 

 each side is an elongate silvery spot over the wing-base. 

 The scutellum is cut off by a sulcus, which is deep except at 

 its middle third ; in form it is a narrow elongate arch, it is 

 narrowly pale at the base, the rest being about the same 

 colour as the hind part of the thoracic disc. The meta- 

 notum is greyish in the centre and furrowed transversely. 

 The prothorax is very evident, arched in plan-profile, the 

 "springing'^ of the arch being just beyond the humeral 

 calli ; the disc is pale, but the margin dark grey ; in fro»»t 

 of it is a well-marked dark orange neck-collar, silvery on 

 the sides ; from the collar arises the orange neck, con- 

 colorouswith the hind head. In side-view the dorso-pleural 

 suture is prominent ; mesopleurse blackish in front, on a 

 triangular patch whose base is on the dorso-pleural suture ; 

 behind this it is very silvery, the silveriness being seen to 

 lie in striae if side-illumination be employed ; the rest of 

 the pleura is orange. In this view the darkened edge of the 

 prothorax is seen projecting like a hood over the neck- 

 collar. Another prominent object is a remarkable large 

 rounded tubercle on the front aspect of the front coxa. 



The ivings have the venation as figured (fig. 16), the 

 extreme base is orange, and all the veins are black. In 

 Williston's paper {op. cit. pi. viii. fig. 27) the wing of the 

 male Paltostoma schineri is figured ; but an error is there 

 made, inasmuch as the anal vein is omitted in the figure. 

 Mr. F. W, Edwards has very kindly sent me a drawing of 

 the wing of one of the paratypes of P. schineri in the British 

 ]\lviseum, which is given in fig. 15, from which it will be 

 seen that that species does possess a short, stout, anal vein. 

 In all its structural details the wing agrees Avith that of the 

 present female, including the close approximation of the 

 first long vein to the costa, so that in vertical view the two 

 appear contiguous, the space between being only visible 

 in obliqi;e view. It may here be noted that the wing of 

 P. superbiens (' Novara Keise,' Taf. ii. fig. 4) differs con- 

 siderably in detail : the well-marked anal angle of our 

 prcj^ent species is absent and the anal vein is long and fine. 



The halteres are bright orange at the base and the elongate 

 head is black, the two colours merging at the middle of the 

 stalk. 



Lef/s. — Relative lengths as in fig. 16. Front: coxa and 

 trochanter pale ; femur blackened except at the paler base 

 (which has a conspicuous black spot^ in front), and a 

 little ochreous just at the beginning of the swollen distal 



