230 



[August, 



external dorso-central bristles behind the transverse groove ; the scutellum is red, 

 with the base mostly black ; the abdomen is shinj black, having red sides in the 

 male and indistinct white transverse bands ; the wings are yellow at the base, with 

 the external cross vein oblique and sinuous, and the little cross vein nebulous. Not 

 common. I found both males and females in Oxfordshire in 1883, it is also in Miss 

 Decie's collection captured at Westward Ho ! and I received a specimen from Mr. 

 Harwood of Colchester. 



N. VAGANS, MgU. 

 This difPers from the former by having the antenna3 more nigrescent, the apex 

 of the second joint and the base of the third only being rufous ; by the thorax being 

 marked with three instead of four stripes, and by the scutellum being red only at 

 the tip. Eare. Captured by Mr. C. W. Dale at Blair Athol in June, 1883 ; found 

 also by Mr. Harwood at Colchester. 



N, APPENDICULATA, Mcq.* 



This has the eyes in the male rather widely separated, the frontal space occupy - 

 rooi -1 ing about one-fourth of the width of the head ; the frontal stripe dark brown ; the 

 Aug., I8i)l. sides of frontalia and face yellowish-white with black reflections ; the antennse black, 

 with the second joint nearly as long as the third ; the arista with the second joint 

 somewhat elongated ; the palpi piceous ;t the thorax with three stripes, and having 

 three external dorso-median bristles behind the transverse groove ; the scutellum 

 quite black ; the abdomen shiny greenish-black, with white tessellations on the sides, 

 but no red ; the wings have the fourth longitudinal vein bent at a right angle, and 

 then forming nearly a straight and oblique apical cross vein, also giving off at the 

 angle an appendix of moderate length, it occupying about one-third of the space 

 from the angle to the margin of the wing ; the external cross vein is nearly straight, 

 the little cross vein is nebulous. I have only seen one specimen (a male) of this 

 well-marked species, which was sent to me in January, 1891, by Mr. Dale for my 

 inspection. 



N. NEMOEUM, Mgn. 

 This rare species has been recorded as British by F. Walker, but I have not 

 seen a specimen. It differs from N. vagans by having the scutellum quite black, 

 the apical cross vein nearly straight, and the little cross vein unclouded ; it may also 

 be distinguished from N. appendiculata by the eyes of the male being sub-contiguous, 

 and by the absence of the cubital appendix, as well as of the nebulosity of the little 

 cross vein. 



N". KUDIS, rin. 

 The diagnosis between N. rudis, Fin., and N. consobrina, Mgn., is involved in 

 a good deal of obscurity. Fallen's description of the former is very vague, and 

 throws no light upon the subject. Kondani docs not mention JV. rudis, but his 

 remarks respecting N. consobrina correspond with those applied to N. rudis by 

 Meigen, Zetterstedt, and Scliiner ; all of whom say that the thorax in the latter 

 species is marked by four narrow black lines. Mcigen's description of N. consobrina 



* Ann. d. 1. Soc. Ent. de Fr., 11, 6, 112. 



t Macquart says that tLcy aiu black, with the basos tostaccuus. 



