1881.) O 



H. SEKVA, Mcig. 

 The specific charnctors ftssignod to this epocies arc insufTiciont to distinguish it 

 from its congeners, especially from //. lucorum and Jl. marmoraia ; it may, however, 

 be easily determined by the following points of difPerenco : in H. serva there are 

 only three bristles behind the transverse suture on the thorax, in each of the two 

 parallel longitudinal rows of sctsp whicli are placed between the middle and lateral 

 black stripes ; wliile in //. hu-ornm and II. marmorata, as in most of the higher 

 Anthomids, there are four bristles in each row behind the suture. In II. serva tlie 

 external transverse vein of the wings is straighter tluin in either of the other species, 

 and not clouded witli brown. The abdomen in II. serra is without the rounded 

 black spots seen in II. hwonnn, but marbled or tessellated as in H. marmorata. 'Jhe 

 posterior tibire of the males in II. .lerva iiave no long hairs or cilise on their inner 

 sides, wliile in II. lucorum tliey are thinly ciliated with a few long hairs along the 

 upper two-thirds of their inner surfaces, and in H. marmorata along their lower 

 two-thirds. //. serva is usually rather smaller than either of the other two species. 

 It is much less common than II. lucorum. 



H. DispAR, Fall. 



There is no doubt but that this is synonymous witli //. nivalis, Zett. Rondani 

 describes the latter species as having the posterior tibite densely ciliated {" inius 

 sub-harbatis seu dense vUlosis"). He does not describe //. dispar, and neither 

 Fallen, Meigen,nor Zetterstedt says anything about the armature of the legs in either 

 species ; so, following Rondani, I named the first specimens of this fly that I saw 

 nivalis ; but, upon obtaining typical individuals of H. dispar from the continent, I 

 found that they had also the beards on the posterior tibife, and were in every way 

 identical with the English specimens named nivalis, so Fallen's name must stand. 

 This species is rare : I received one male from Mr. C. W. Dale (Dorset), and found 

 one in a collection of unnamed insects made by the late Mr. F. Walker. 



H. YAGANS, Fall. 

 I have introduced tliis species into the British list upon the authority of (he 

 late Francis Walker ; but I have never seen a specimen, either English or continental, 

 that agrees with the description given by authors. Mr. Kowarz, of Franzensbad, 

 sent me two which he had taken from the collection of Professor Loew, in which tliey 

 were placed and named as vagans, but they were exactly similar in all points to IL 

 lasalis of Zetterstedt, only of rather a larger size. The femora were all entirely 

 pale, and the palpi black, while in the description of vagans given by Fallen and 

 Meigen the anterior femora are given as partly black, and Meigen says the palpi are 

 red at the base. I suspect that H. vagans, Fall., and //. basalis, Zett., are only 

 varieties of the same species, but this can only be determined by the examination of 

 typical specimens in the collections of Fallen and Meigen. 



H. SCUTELLARIS, Fall. 



This species varies very much in several particulars, and has, on this account, 



been described under several difl'erent names. Sometimes tlie antenna are entirely 



black or grey, at other times the first two joints are rufous. In some specimens the 



arista is longer-haired than in others. The scutellum is sometimes entirely yellow. 



