1881.] 151 



abundant amongst the low herbage, and on the water dock, on the marshy flat land 

 at the northern end of Martham Broad. The B. chalybeus of Stephens' list was, 

 probably, as Haliday remarks, the D. chalybeus of Meigen, which is only a variety 

 of D. cenens, Deg. 



(2) Gymnopternus assimilis, Stseg. — I am very suspicious that we have more 

 than one species under this name. True G. assimilis resemble G. cerosus, Fall., but 

 have a silvery instead of black face, but the specimens caught here, besides some 

 others I possess, have also the lamellse of the hypopygium reddish instead of blackish. 

 The British species of this genus will well bear close examination ; to the eleven in 

 Walker's Insecta Britannica, I have now added nine, one of which, however, (G. 

 august if rons, Stseg), though named by Loew, is, I fear, only a small G. cupreus, Fall. 



(3) Hydrophorus bipunctatus, Lehm. — When a slight ripple prevented this 

 species from running about freely on the water, it was in countless thousands on the 

 edges of the lakes. 



(4) Hydrophorus viridis, Meig. — True H. viridis, Mg., has a white face ; how- 

 ever, a specimen I once caught at Hendon, which was named viridis by Loew in 

 spite of an orange face, is clearly identical with the one specimen I caught at Ormesby. 

 At Martham I caught one other specimen with an orange face, but this is clearly 

 distinct, and the same as a species of which I once took one at Seaford. I do not 

 like to describe new HydropTiori from such poor material, and I possess a third 

 species in one specimen from the little stream which crosses the road at the foot of 

 Loch Callater, which seems undescribed. Of all the other British HydropTiori I 

 possess full series. 



(5) Clirysog aster splendida, Mg. — I have no doubt as to the naming of this 

 species (new to me), though the tarsi show but very faint signs of yellow, yet the 

 reddish under-side of the third joint of the antenna? clearly distinguishes it from C. 

 metallina, F. ; I failed to distinguish it when catching it. 



(6) Platychirus fulviventris, Macq. — This species is readily distinguished from 

 its allies by its entirely yellow femora and tibia? ; also, from P. scambus, Stseg. and 

 P. immarginatus, Zett., by the tolerably abundant equal pubescence behind the front 

 femora ; those two species having about six long black hairs extremely distinct from 

 the shorter pubescence. It agrees with these two species in the large extent of the 

 yellow spots on the abdomen, and therefore differs in this from P. clypeatus, Mg., 

 angustatus, Zett., and podagratus, Zett., all of which also have the hind femora and 

 tibise with a broad blackish ring. I caught only one at Martham, but I find I took 

 one a year ago at Burwell Fen. 



(7) Asciafioralis, Mg. — This was very abundant at Martham, and had all the 

 usual variations, which I cannot help thinking include A. quadripunctata, Mg., and 

 A. dispar, Mg., and possibly even more so-called species. 



(8) Graphomyia picta, Zett. — I captured one male of this at Martham Broad. 

 The first notice of this supposed species was made by Zetterstedt, in 1845, under 

 Cyrtoneura maetdata, Dipt. Skan., iv, 1356, as a singular variety of the male, in 

 which that sex has the colouring of the female. He, however, speaks of it as taken 

 by Wahlberg in one place " (Cedershal prope Holmiam) in pluribus exemplis." 

 Wahlberg subsequently (1852), in the notes of his travels, incidentally mentioned it 



