BITHYS QUERCUS. 245 



following segments. There is a darker dorsal line, a pale (white ?) 

 band down each dorsal ridge, and a pale lateral flange, with oblique 

 pale lines between (downwards and backwards) the 2nd and 3rd 

 thoracic and the lst-7th abdominal segments. This is from a dorsal 

 view. On a lateral view, what seemed from above to be a pale lateral 

 flange is, in reality, a broad pale band along the lower part of the slope, 

 separated by a fine dark line from the narrower white line of the flange 

 proper. Beneath the flange the colour is again darker, paling gradu- 

 ally to the ventral line. As already noted, the head is black, smooth, 

 and shining, with six eyespots, five outside and a central one ; several 

 hairs on clypeus, about eyes and on vertex, symmetrical ; mouthparts 

 pale fuscous ; jaws and labrum brown. The prothoracic plate, legs, 

 hairs, and hair-bases, black, but so delicate that, when magnified, they 

 are light fuscous ; the hair- bases are large, trumpet-shaped, but with 

 a mere trace of the divisions, etc., that make these hairs, in some 

 species, like flowers (Convolvulus, etc.). The hair-spiculae (present on 

 all hairs) are so short and appressed that finely serrate would better 

 express their size, but not their arrangement ; they are uniformly 

 spread over the hairs. The prothorax has a plate 025rnm. across, the 

 front margin rounded, forming an arc of about 100° of a circle, the 

 posterior margins might be the corresponding radii, with the central 

 angle cut off and with some irregularities. On either side, on its front 

 margin, are two hairs (about 02mm. long) with a very large lenticle 

 between them ; there is also, on each side, a large central hair, one at 

 the outer angle, and one at the middle of the posterior margin ; there 

 are, on the disc, also, two or three minute lenticles ; on the segment, 

 along the margin of the plate and towards its outer angle (and there- 

 fore placed obliquely), are three hairs (about 021mrn.), and parallel 

 with these, and in front of spiracle, two others, not quite as long ; 

 there are also two small hairs (about 0*06mm.) at base of legs ; these 

 are represented on all the following segments ; the spiracle is large 

 with a rather tall conical base. The mesothorax and following- 

 segments have a similar hair distribution, and it may be better to take 

 each set of hairs and follow them along. On the mesothorax is a 

 short hair, not far from the middle line, close to anterior margin (about 

 015mm. long) ; this hair is the same on the metathorax, is wanting on 

 the 1st abdominal segment, but occurs on the 2nd to 7th abdominals, 

 if, as seems difficult to doubt, it is the same one, rather outside than 

 inside the line of hairs assumed to be the setas of tubercles i and ii ; 

 that on i is a long hair, upstanding with a sweeping curve, making its 

 extremity directed backwards ; it is the chief element of the crest (ii 

 assisting) seen on a side view of the larva, and standing up as a plane 

 when it is seen in front ; it is shorter in front, 02mm., and longer 

 behind, 0-3mm. on the 7th and 8th abdominal segments. There is 

 a short (0-1 5mm.) dorsal hair on the 9th abdominal segment, that is more 

 probably the seta of ii. The hair on tubercle ii is a shorter hair than 

 that of i (0-lmm.-0-12mm.,on the3rdabdominal0 # 16mm.), rather larger 

 on the central than on the end segments, excepting that, on the thorax, it 

 is nearly equal to i ; it arises outside and behind that of i. On the 7th 

 and 8th abdominal segments its place is taken by a large lenticle with 

 a high conical base, very like a spiracle. Between these and the 

 margin, is (on the abdominal segments 1-8) the spiracle, and between the 

 seta of ii and the spiracle a group of lenticles and hairs. On the 2nd 



