INJURIOUS TO THE TUSNIP CKOl*. S97 



Steph. yfe»iw.— Tinea Xylottellay Linn. Fn. 8u«c.— Pi«t«Wa Cruei/erarttm, 

 Zeller (Zeit. 1843, p. 281) ; and is figured in Wood's Ind. Entomol., fig. 

 1647, and Westwood & Humphrey's British Moths, pi. cxviii., f. 4. lU 

 palpi are cleft to the middle, and appear like horns around its mouth, 

 whence the generic name; the antennn are distant, porrected, silvery 

 gray ; head uilvery, with a slight brownish tinge on the crown ; body 

 shining oinereouH ; fore wings narrow, with a depression before the tips, 

 which are turned up, and fringed, dusky cinereous, with a white sinuated 

 streak, extending to the aual angle, edged in front with a darker shade ; 

 hinder wings of a paler ash, deeper behind, and on the ribs, edged with 

 a cinereous fringe. Expansion of the wings 6 to 7) lines. 



1 find it on moors and in woods at various periods of the season ap to 

 November. It appears on the turnip fields in August. 



NOTEE. 



DIPTBRODS INSECTS INDUBIOUS TO TRB TDBNIP. 



In this note 1 will endeavour to give such additional particulars as I have 

 been able to ascertain, since the foregoing memoir was written, respecting 

 those two winged files, whose larvas are prejudical to the turnip. The 

 Anthomyia, whose maggot I have alluded to as destroying the leaves by 

 undermining the base, is, as I conjectured, the Anthomyia radicutn of 

 Meigen, wliich is probably the A. Brasificoe of Bouche, and perhaps also 

 of Curtis, but I have not seen the description of the latter author. The 

 maggot is white, with a tint of straw-yellow, elongate cone-shaped, tapered 

 in front, somewhat obliquely truncate behind ; head with two black 

 hooks, which diverge posteriorly beneath the skin ; intestinal canal distin- 

 guishable onlv behind, by a pale brownish internal line, or merely by its 

 pellucidity; body rather smooth, slightly wrinkled; segments pretty 

 distinctly separated, more so beneath, and on the sides, where there Is a ser- 

 ies of ill-defined welled depressions when it moves, occasioned by the ver- 

 micular contraction of the rings; truncated end with a few wrinkles, 

 furnished with two chestnut brown spiracular plates ; its margins with 

 12 lobes, of which the two lower ones on each side approximate and are 

 double; the second closely adjoining the first, and mors projecting; the 

 remaining four disposed more apart, and becoming less by degrees ; an 

 unoccupied space above dividing each series ; the underside of this (the 

 anal) segment, near the apex, bearing two approximating conical tuber- 

 cles (prolegs), its surface much lovealated transversely behind the 

 tubercles, and hollowed round the anus ; body beneath more wrinkled than 

 above, the segments after the four first, rather elevated, and slightly 

 roughened or "sub-granulated across the middle. Length 2^ — 3 lines. 

 When younger it is whiter and more transparent, and shews more distinctly 

 than when farther advanced, along each side of the back, two fine white 

 lines, which converge anteriorly after forming several undulations, and 

 then widen out to join the fore lamellar chestnut spiracles, which are 

 situated, one on each side, about the commencement of the third ring. 

 These are straight posteriorly where they terminate in the hind spiracular 

 plates. The pupa issub-cylindric, nearly straight, with the ends somewhat 

 conical and contracted ; brown, or deep chestnut with the tips more 

 obscure, slightly shining ; segments indistinct, finely and closely striated, 

 or rather wrinkled, transversely, the three first more roughly, and with 

 their sides keeled, somewhat depressed or foveated above and beneath 

 along the border of the keel ; the tip with two rather distant, somewhat 

 divergent, lamellar spiracles, the inter-spaoe roughened, and having two 

 blackish elevations about the middle ; the black oral processes visible 

 beneath the skin, as viewed from the underside ; posterior end rounded- 

 truncate, with two slightly projecting brown spiracles separated by % 

 sunk line, furnished with ten marginal lobes, of which the two lowest are 

 bilobed, and the two uppermost minute ; a wavy raised line forming « 

 •light rim above ; two slight mammillie beneath separated by a fiasure. 



