IS87.] 75 



of which is rather obscure) captured (I believe) in Dorsetshire. It is characterized 

 by the upper halves of the wings, with the exception of the tips, being nigrescent ; 

 the colour is very dark throughout the whole of the sub-marginal cells, and gradually 

 becomes paler as it extends downwards, terminating in the lower edge of each 

 discoidal cell. The lower portion of the wing and the tip are quite clear. The 

 thorax is ash-grey ; the abdomen of a yellowish or brownish-grey colour, sometimes 

 marked with an indistinct dorsal stripe, and with two small round spots on each of 

 the last two segments in the male, and upon all the segments in the female. The 

 antenn£B have the two basal joints yellow, and the third one black, with a sub-plumose 

 arista. 



C. GENICULATA, Fall. 

 I admitted this species into my list in 1883, though I had not then seen a 

 British example. I captured one, however, in my garden near Bradfoi'd in June, 

 1886. It may be known from C. sexnotata, Meig., by the points of the hind femoi'a 

 being black. 



CHIEOSIA, Eond. 

 Gen. ch. — Eyes bare, remote in both sexes ; arista pubescent ; 

 abdomen of male nai'row and elongated with small sub-analappeudages ; 

 alulets with small equal-sized scales ; wings having anal veins extended 

 to the margin. 



C. ALBITAESIS, Zctt., Eoud. 



This pretty and peculiar little species, which Mr. Verrall has recorded as a 

 native of Scotland, has the thorax brown with grey shoulders ; the abdomen dark 

 brownish-grey, hairy, and marked with an indistinct, longitudinal, black interrupted 

 stripe. The wings are slightly brunescent ; the legs in the male have the front tarsi 

 longer than the tibise, and the three proximal joints more or less marked with white. 



This genus was formed by Rondani for the reception of the above-mentioned 

 species, and as this had not been recorded as an inhabitant of Great Britain at the 

 time my " Annotated List of British AntliomyiidcR " was drawn up, I did not 

 include it. In my analytical table of the genera with widely separated eyes in both 

 sexes, which was published in the Ent. Mo. Mag., vol. xx, p. 50, the genus Chieosia 

 should have had its place between Mtcophaga and Chelisia. 



CHELISIA, Eond. 



C. TETCOLOE, Zett. 



This small and rare species bears a close general resemblance to C. mollicula, 

 Fall., so I have placed it in the same genus ; it must, however, be looked upon as an 

 aberrant species, for the male is destitute of the large and complicated genital pro- 

 cesses seen in C. mollicula, which form one of the characteristic features of the 

 genus. 



C. tricolor has very short (almost rudimentary) anal veins, so I cannot put it 

 into the last genus (Chirosia), though it would agree with its other characters. The 

 antennae are wholly black ; the arista is pubescent ; the thorax is grey, marked witli 

 two indistinct stripes ; the abdomen has the first and second segments yellow, and 

 the third and fourth, gi'ey, each segment being marked with two black spots. The 



G 2 



