2G0 



, April, 



2. Albiceps, Meig. ? Macq. ? 



G-rey, marked and tessellated with blue-black. Face pure white. 

 Middle tibiae shortly and evenly ciliated. Both anal segments of ^ 

 black. Three dorsal thoracic bristles behind the suture. 



Length 4 — 5 lines. 



This species differs from S. carnaria, in being usually smaller, and of a more oval form ; 

 the colour is bluer ; the face silvery- white, and less prominent ; the stripes upon the thorax are 

 wider, and less distinct ; the thoracic bristles differ in number, there being only three behind 

 the suture, and two in front of it ; all of which are much longer and stronger, and of more 

 even size, than those in 8. carnaria, see Fig. 2.* The costal spine is usually more distinct ; 

 the heard upon the posterior tibife less thick ; and the middle tibias are only clothed with 

 short hairs, of an even length, along the whole surface. The ? is very similar to the <J , with 

 the exception of the usual sexual differences. 



This species is not common : I have one ^ in my own collection, 

 and there are one ^ and one ? in that of IMr. Yerrall, one of which was 

 captured at Lewes, Sussex, and the other at Lyndhurst, Hants.f 



I have called this species alhiceps, as in colour and general charac- 

 ters it resembles the one so named by Meigen ; but the description of 

 his species is so imperfect, that it is impossible to identify it with 

 certainty. 



3. Ateopos, Meig., Macq., Zett., Schin. 



Grey, striped and tessellated with black. Three posterior dorsal 

 thoracic bristles. First anal segment in ^ grey, often marked with 

 lines or spots. Length, 3 — 4 lines. 



This well-marked species closely resembles the smaller specimens of S. carnaria, both 

 in general form, colour, and markings; but it differs from them essentially, in having only 

 three bristles in the posterior part of the dorsal thoracic row, and two in the anterior part, 

 which in size and arrangement resemble those of 8. alhiceps. It also differs from both the 

 preceding species by the colour of the first anal segment of the <?, which, instead of being 

 shining black, is pale grey, marked by a transverse and sometimes a vertical dark line, and 

 in some specimens with two lateral small dots. This design upon the anal joint is frequently 

 partial or indistinct, and often altogether wanting ; the segment being of a plain grey colour. 

 The legs are armed and ciliated as in small varieties of 8. carnaria, there being a short beard 

 upon the middle tibiae of <J . The 9 is not known. 



• Tbough this figure is intended to represent S. mdanura, the thoracic part will equally 

 apply to both.— U. U. M. 



+ I beg to express my thanks to Mr. Yerrall for his kindness in placing hia lai-gc ami valuable 

 coUcetiim of l-ucmghoytalu at my service.— U. H. M. 



