PERICOMA. 259 



the wing- ; prsebrachial areolet defined. Legs yellowish ; femora with 

 an indistinct ring towards the tip ; tibiae with the base, apex, and a 

 ring between, dusky ; tarsi with the end of the first joint and the last 

 three entirely dusky. Male. Antenna nearly as long as the body. 

 Fern. Antenna? longer than the thorax. Borer rather long and slender. 

 Not rare on the shores of lakes and of the sea, where I have 

 found the pupa in the moist sand. (I.) 



7. trifasciata, Meig. Kl. i. 44. 3. pi. 2. f. 20 (1804); Zw. i. 105. 

 8 ; Latr. ; Mcq. ; Zett. Albo-hirta, alls lanceolatis fasciis tribus nigris 

 per fimbriam utrinque continuatis, pedibus albidiz, tarsorum articulis ex- 

 tremis (4) nigricantibus. 



The " angular" middle black band is produced by the black hairs 

 continued along the first externo-medial veins, almost connecting that 

 band with the outer one. 



Var. /8. dealbata. Albido-hirta, alis nigricante trifasciatis, tarsis 

 apice fuscis. 



Not common. (I.) Larger than the preceding. (Wings 

 rather broader?) White colour less clear, and blackish bands 

 less contrasted ; dusky tip of the tarsi much less deep in colour, 

 scarcely extending beyond three joints. Perhaps the other sex 

 of the preceding ?, or a distinct species ? 



Var. y. deaurata. Mavido-hirta, alis nigricante trifasciatis, tarsis 

 apice fuscis. 



Like var. /?, but the hairs are yellow instead of white. " My spe- 

 cimens were taken on bushes in the bed of the Eiver Dodder, near 

 Dublin, but are too much rubbed to afford good characters, though I 

 can scarcely doubt it is a distinct species." 



8. palustris, Meig. Kl. i. 43. 2 (1804); Zw. i. 105. 2; Mcq.; 

 Zeit.auriculata, Hal.; Curt. B. E. 745. f. 9. T. ! Albo-hirta, alis 

 ovatis nigricante trifasciatis, tarsorum articulis extremis nigricantibus. 



Head, thorax, abdomen, and wings clothed with white hairs. Wings 

 with three blackish bands, the second angular, the third occupying the 

 apex; fringe white, with two dusky patches at each margin (corre- 

 sponding to the middle black band and the outer one, the cilia of the 

 tip remaining white). (Veins of the wings drawn in Curt. B. E. 745.) 

 Legs dusky, clothed with whitish hairs ; end of the tibia and metatar- 

 sus, and second joint entirely on one side at least glossy-white ; the 

 last three joints dusky. When the hairs of the thorax are removed, 

 there appears a clavate appendage at the front of the thorax on each 

 side. (See Curtis's figure.) 



According to Meigen this should be the largest species of the 

 genus (2 lines long), which is not the case with mine. Many of 

 the species vary much in size ; still this casts some doubt on the 

 determination of mine, which is smaller than P. nnljlla. Com- 

 mon. (I.) 



