the Larva and Pupa of the Geniis Sabafinca. 443 



before backward, the three successive pairs of legs are placed slightly 

 further apart from before backwards. 



Abdomen with only nine definitely marked segments, the two 

 last (nth and 10th) being completely fused together. First abdominal 

 segment very short ventrally, but slightly longer than the meta- 

 thorax dorsally. The succeeding segments rapidly lengthen and 

 widen up to the 4th, which is about equal to the 5th, but differs from 

 it in the narrowing of the dorsal portion, which is also more darkly 

 coloured, as described above. From the 5th segment backwards, 

 each segment becomes slightly narrower than the one preceding it, 

 their lengths remaining about the same, the 5th segment being about 

 4J times as wide as long. The last segment is well rounded posteriorly, 

 and carries the anal opening at its extremity. Abdominal legs of 

 sm.all size, finely shagrcened and strongly pointed, though not 

 definitely segmented : they are clearly to be seen in the half-grown 

 larva, but in the full-fed larva are retracted and invisible Avhen 

 at rest, though they can just be seen when the larva is walking. 

 Spiracles present on abdominal segments 1-8 inclusive, making, 

 v/ith the prothoracic spiracles, a total of nine pairs. Each spiracle 

 is a small circular orifice surrounded by a broad supporting rim about 

 thrice the diametei' of the opening, which shows no signs of any 

 sculpturing. The abdominal spiracles are placed slightly above and 

 anterior to the lateral row of macrotrichia, and lie at the level of the 

 lower edge of the dark colouring already described, but separated 

 from it, in the case of segments 2-4, by a small circlet of cream colour. 



Chaetotaxy : — Referring again to the shape of the larva in trans- 

 verse section, which is hexagonal, it will be seen that, owing to the 

 concavity of the dorsal and two latero-dorsal sides, there are four 

 strongly-developed ridges running almost the whole length of the 

 larva (Plate XXXIV, fig. a) ; two of these may be called dorsal ridges, 

 the other two lateral ridges. Each segment from the metathorax 

 to the 8th abdominal carries four large, specialised macrotrichia, one 

 projecting from each of these ridges, as shown in Plate XXXIV. In 

 addition to these four macrotrichia, the mesothorax possesses another 

 pair, situated on two small pale areas between the dorsal and lateral 

 ridges on each side, but closer to the former than to the latter. 

 The prothorax carries no less than six pairs of these macrotrichia, 

 four pairs being arranged around or very close to the anterior ridge 

 and two pairs dorsally behind it. The head is devoid of macrotrichia, 

 as would be expected owing to its retractile nature. The last 

 abdominal segment, consisting of the fused 9th and 10th, carries 

 four pairs of macrotrichia. 



Each of the macrotrichia (Text-fig. 1 , /") is set in a small but definite 

 base, and is of the form which I have already named dolichasfer (Greek 



