AGRTADES CORIDON. 71 



The back is very highly arched from the 2nd to the 9th segment, and 

 from there slopes away in every direction. In the middle of the 

 back is an exceedingly shallow depression in which the dorsal vessel 

 pulsates ; it would scarcely deserve to be mentioned if it did not 

 produce an illusion as to whether there may be a strong lengthwise 

 depression here. Each of the eight above-mentioned segments has a 

 depression in the middle which extends as far as the spiracles, which 

 lie high up on the side but in the depression, and are very clear and 

 striking in consequence of the black border which surrounds the open- 

 ing. Below the spiracles a very broad flange edges the body length- 

 ways, beneath which another, not visible from above, has its place 

 above the legs. The head is placed in a bordering of skin, out of 

 which it scarcely ever comes. The ground colour of the body is a 

 pleasing light blue-green, lighter on the underside, especially below 

 the flange, and in the region of the claspers lighter still. The eight 

 segments mentioned have each, on both sides of the dorsal vessel, a 

 pleasing yellow spot, by which two rows of yellow dorsal spots are 

 formed ; of these the foremost are rounder and smaller, the rest larger, 

 broader behind, and yellower. The whole lateral flange has the same 

 yellow colour ; above the claspers, not visible from above, is yet 

 another row of very obsolescent yellow spots. The whole body is 

 furnished with fine warts, of which those on the yellow spots have a 

 yellowish-brown, the rest a black, colour ; all bear light foxy-red 

 bristles, the former somewhat longer ones, whilst the warts which are 

 situated on the green ground colour bear extremely short, scarcely 

 perceptible, bristles ; the longest are those on the lateral flange and 

 on the row of spots above the true legs. From this results the follow- 

 ing diagnosis — Larva onisciform, bright green, with two series of 

 dorsal triangles and the lateral edge of the body yellow; the head, and 

 very conspicuous spiracles, black. Before pupation the larva becomes 

 lighter, even with regard to the yellow spots (ZeUer). The head is 

 almost globular, but rather produced towards the mouth ; it is about 

 one-third as wide as the prothorax and entirely retractile within that 

 segment ; the body is woodlouse-shaped, and, in crawling, as in resting, 

 both the head and legs are concealed ; the divisions of the segments 

 are decidedly marked ; on the back is a double dorsal row of eight 

 approximate humps, two on each segment from the mesothorax to the 

 6th abdominal (both inclusive); the margin of the body is dilated all 

 round, and this greatly contributes to the woodlouse appearance of the 

 larva ; the surface of the larva in this respect closely resembles the 

 glandular surface of the stems and leaves of some plants ; these gland- 

 like bristles are particularly observable on the dilated lateral margin ; 

 the legs and claspers form a double medio- ventral series. The colour 

 of the head is dark brown, almost black, and highly glabrous ; the 

 body is dull opaque-green, with six longitudinal series of oblong 

 gamboge-yellow spots ; two of these series are dorsal and approximate, 

 and each series consists of eight such spots ; the direction of the spots 

 is rather oblique, and the anterior extremity of each is rather narrowed ; 

 these dorsal spots occupy the summits of the humps already described ; 

 another series of very similar yellow spots is marginal, occupying the 

 lateral dilatation of each segment, and above this marginal series of 

 yellow spots are the circular and rather conspicuous spiracles ; in 

 the two remaining series the yellow markings are linear and 



