568 Mr. C. L. Withycombe's Notes on 



unhatched, brothers. Tlie first-instar larva is light 

 greyish-brown in colour, with tlie head almost entirely 

 black. Generally the body is devoid of markings. In 

 the second instar some differentiation of head pigmentation 

 occurs, and in a few cases the larva is very similar to the 

 third-instar larva. Most, however, at this stage, are not 

 so brightly coloured as when full grown, although the 

 body frequently has indications of later markings. It is 

 rare to find a larva in its second instar with the very 

 characteristic red central dorsal area of the older larva. 



Description of Third-instar Larva, (Plate XLII, fig. 2.) 



Length when full fed about 8 or 9 mm. Body covered with 

 setigerous warts. General colour greyish-brown, with a more or 

 less bright brick-red central dorsal area in the meso- and meta- 

 thorax. The first two lateral abdominal prominences and warts 

 are also red. 



Head white with a black central mark extending from the middle 

 to the anterior margin. Two larger patches of black diverge from 

 the base of the head almost to the eyes. Occasionally there is a 

 variation of head markings in the direction of C. perJa, but I have 

 never seen a form which could be confused with perla. Antennae 

 greyish; palpi white at bases, becoming grey distally; jaws 

 castaneous, darker at tips. 



Prothorax whitish anteriorly; betM^een and behind warts, dark 

 brown. Sides v/hitish. Sclerites shining black, somewhat trape- 

 zoidal in shape. Meso- and metathorax dorsally dark brown, 

 with a median area of bright brick-red colour. The dorsal surfaces 

 of the mesothoracic lateral prominences are much lighter in colour 

 than the metathoracic prominences, which are, including warts, 

 almost black above. Sclerites are small, rounded, and shiny black. 

 The smaller warts lying within the red central area are whitish. 



Abdomen mottled with greyish-brown above, laterally between 

 the segments whitish. There is little indication of a lighter median 

 area, though often there is a slight continuation of the central red 

 area from the thorax into the anterior segments of the abdomen. 

 The first two lateral abdominal prominences, with their warts, are 

 usually red in colour, the remaining abdominal prominences being 

 brown, sometimes with a flush of red. A median dark brown line 

 runs the whole length of the body. Underside, greenish-white 

 with indications of brown longitudinal lines on each side, latero- 

 ventrally. Legs translucent greenish-white, smoky just below the 

 knees and also at the tips of the tarsi. 



