80 [April, 



threo-stripod, the stripes most distinct in male ; three pairs of hirge acrostichal 

 bristh's nnmixed with smalk^r ones in front of the suture, approximated and 

 nearly half as large as the dorso-central ; scutellum grey. Abdomen grey and 

 unstriped, not recurved at the end in the male, and with two small flaps under- 

 neath. Eyes subcontiguous ( (? ), widely separated ( ? ) ; frons rufous in both 

 sexes, the margins white, face white ; antennte wholly black or with the basal 

 joints obscurely rufous ; palpi black. Legs yellow ; fore femora of male mainly 

 black, only the iinder part towards the apex more or less extensively yellow, 

 middle femora with a double row of long weak l^ristles on the inner side, crowded 

 at the base, tliinning out and past the middle vanishing ; of female, fore femora 

 mainly yellow, only the upper side black, middle femora without the above 

 bristles; in male, fore tibiae with a preapical bristle and another about middle 

 of outer side, middle tibiae with three on the inner side — one just below upper 

 edge and two at a rather lower level, hind pair 3, 3, 2 on upper, outer, and 

 under sides respectively, the two on under side close together and jxxst below 

 the middle : in female, fore tibiae as in male, middle tibiae with three bristles as 

 in male and a fourth on outer side at junction of middle and lower thirds, in the 

 single female before me bristles on hind tibiae veiy different on the two sides — 

 on the left side 2, 2, 3 on the several aspects, on the right 2, 5, 1. Wings clear, 

 the large cross-vein straight or nearly so, halteres yellow. 



The great irregularity of the bristles of the hind tibiae in the 

 female is remarkable, and if not due to the somewhat artificial con- 

 ditions to which the insect was exposed, indicates that little value as 

 a character can be given them in the case of this sex. In the row of five, 

 the three extra bristles are only half the size of the two ordinary ones, 

 and about as large as the single one on the lower side. In one of the 

 males also the bristles of the middle ti])ia on the left hand are 1, 3, 

 instead of 1, 2. Herr Stein's observation on the insect was "near allied 

 to interrujjfeUa, Ztt." I am, however, unable to compare them, as I 

 have never seen interrwptella, nor have had access to a description of it. 



I have at no time met with dnlcamarx on the wing. My few 

 specimens (three ^ s, one ? ) were obtained by breeding. For some 

 years past I had been awai'e that the leaves of Solanum dulcamara 

 were mined by a dipteron that made large white blotches in them. 

 But it was a long time before I succeeded in finding out what the insect 

 was ; partly because the mines, whicli were very scarce, liad been 

 vacated before I found them, or because the larvse turned out to be 

 stung. However, in the autumn of 1911, I came upon a small plant 

 by the edge of Devereux Pool on which were four full mines, and was 

 fortunate in getting out the following April four perfect insects. The 

 rearing presented no difiiculties. The mines were placed in a shallow 

 tin box and over them was laid a layer of fresh leaves to keep them 

 from drying, and in amongst these the larvae pupated comfortably. I 



