COSMOTRICHE POTATORIA. 171 



placed at apex of diamond-shaped cream-coloured mark ; a slight 

 tuft is present on the 8th abdominal arising from the anterior trapez- 

 oidals, which are now very close together and situated on a slight 

 hump, the tubercles themselves only slightly traceable (Bacot. 

 July 29th, 1896). (Third instar: not described.) Fourth instar 

 (hybernating stage) : About 25mm. in length, much darker and 

 more richly coloured than previously ; the white lateral tufts present 

 in 3rd instar on thoracic and 1st abdominal segments are now 

 continued on all abdominal segments as far as the 8th ; hairs 

 thicker, and more abundant ; the larva tapers somewhat from 5th 

 abdominal to anus viewed dorsally, viewed laterally the tapering is 

 more pronounced, the meso- and metathorax being the tallest seg- 

 ments ; head large, very hairy, slightly trapezoidal, very slightly 

 if at all notched on crown, mottled (as in 3rd instar), much 

 darker; the subdorsal ("ear") tubercles on prothorax still pro- 

 nounced ; the dorsal tuft on mesothorax stronger, and, in addition, 

 there is a row of small tufts down either side of back, three 

 pairs to each abdominal segment; the first pair much stronger 

 than the following pairs ; on the 8th abdominal, which is raised 

 and rather stronger than the 7th, there is a strong, black, central 

 dorsal tuft ; the mediodorsal line or band consists of scattered 

 yellow dots and specks ; the subdorsal band, formed in a similar 

 manner, is much stronger ; the prothoracic scutellum is not par- 

 ticularly conspicuous ; the dorsal tuft on mesothorax is black in 

 front and brown behind ; the bright yellow subdorsal spots on 

 meso- and metathorax are still strongly marked; on the 8th ab- 

 dominal segment, behind the central tuft, there are two smaller 

 ones situate on either side of the mediodorsal area ; the oblique 

 stripes are now indistinct in consequence of their breaking up 

 into yellow dots ; the diamond - shaped patch on dorsal area of 

 meso- and metathorax has lost its definiteness of outline, also on 

 account of its breaking up into scattered dots ; the hairs jutting out 

 from prothorax are from 8mm. to 12mm. in length and arise prin- 

 cipally from the "ear" tubercles; ventral area dark grey-brown 

 with a whitish line on either side ; prolegs long, with X-shaped 

 foot, an oblique whitish line down each proleg (Bacot. August 30th, 

 1896). ? Sixth instar (possibly had moulted once since hyber- 

 nation) : The 8th abdominal distinctly humped, the tuft of hairs 

 arising from the hump ; the dorsal thoracic tuft arises chiefly from the 

 posterior of the mesothorax, but partly from anterior of metathorax ; 

 there is also posteriorly on either side of the dorsum of the 3rd — 7th 

 abdominal segments, a small black tuft ; the " ear -tubercles " still very 

 large (Bacot. April, 1897). The ovaries in the $ larva are yellow, 

 the testes in the $ larva also yellow (Bessels). Fenn describes 

 the fullgrown larva as : " Head large, rounded, dull greyish-brown 

 streaked with ochreous ; mouth black. Body hairy, cylindrical ; 

 small, black, short, dorsal tufts on each segment, surrounded by 

 long reddish-brown hairs ; mesothorax and 8th abdominal segment 

 each with a larger and longer tuft, that on the 8th abdominal 

 blackish and pointing backwards; sides with long reddish-brown 

 hairs and tufts of short whitish hairs below the spiracles ; ground 

 colour dull blue-black ; a broad subdorsal band composed of numerous 

 yellow spots, and with yellow markings above the lateral white tufts ; 



