110 [October, i 



veinlet. The character, however, most readily noticed is, that all the 

 transverse veinlets and bases of cells are darkened. The great cross- 

 vein is at or a slightly beyond the middle of the discal cell. The' ^ 

 thorax is light brown with darker stripes, and the abdomen dark brown 

 with yellowish incisures, the appendages being luteous. 



X. lucorum, Mg., and L. septum, Ver. : I have nothing to add to 

 these species, except that L. sepium seems not uncommon in the south 

 of England. 



L. nemoralis, Mg. : very common, as I believe all the variations 

 come back to one species, but yet the variations are so strong that I 

 recommend the species to further study. 



L. filata, Wlk. : this species is hopelessly unrecognisable from 

 "Walker's description, so T give a few extra characters, especially as I 

 do not recognise in it any known continental species, although it is 

 not uncommon in Great Britain. 



It is a small blackish species with a narrow body and narrow wings, belonging 

 to the group with a Tcry short fork to the upper vein from the discal cell, in fact, in 

 L. filata the^br^ is often altogether alseiit in one wing, and occasionally in both ; 

 the base of the discal cell is almost in a line with the two cells above it ; the great 

 cross-vein is sloping, and placed rather before the middle of the discal cell, the last 

 vein is shortish and nearly straight. The frons is broad and hoary, the thorax 

 slightly greyish-black, sometimes with three indefinite stripes, the " pits " shining 

 black, and a spot on the middle near front of thorax conspicuous ; the halteres are 

 dirty whitish ; the abdomen has some short yellowish hairs about the sides and on 

 the blackish hypopygium ; the legs are all blackish-brown, slightly tinged with 

 luteous about the base of the femora. In the female the femora are rather paler. 



It is somewhat common in the New Porest, and I have caught it 

 in Kent and Sussex, and also at Loch Maree. 



i. senilis, Hal. : this is another species which has been a great 

 stumbling block, because Haliday has called it a Dicranota, with the 

 13-jointed antennae of that genus. As a matter of fact it has the 

 normal 16 joints. I can add but little to Haliday's remarks in 

 Walker's " Insecta Britannica Diptera," iii, p. 307, because, as usual, 

 Haliday has seized all the important characters ; how he made the 

 mistake about the antennae puzzles me. The wings are broad and 

 very pilose towards the tip, the end of the sub-costal vein is about 

 the same as in Westwood's figure in Walker's book, only it is much 

 less distinct, being almost lost in the large, indefinite, sub-coriaceous 

 stigma ; the discal cell is much broader at its end than at its base, the 

 stem of the forked vein two and a half to four times as long as the 



