TALEPOEIA TUBULOSA. 223 



ward movement, like that of a Tortricid larva, it can also drop by a 

 thread if disturbed (a feature apparently common to all young Psychid 

 larvae). Head and thorax black, or very dark brown ; abdomen pale 

 yellow or whitish ; anus dark, apparently due to internal matter. 

 Head. — Small, black, glossy, carried rather flat (horizontal), sutures of 

 clypeus* faint, carried far back towards crown of head. Looked at 

 from above, the outline of the head appears to be somewhat square ; 

 the setaa, in about usual numbers ; the antenna? rather long and 

 conspicuous. The thoracic and abdominal segments increase 

 gradually in width, to the 4th abdominal segment. Between the 

 head and prothorax there are folds of whitish skin. The head, 

 prothorax and mesothorax are all retractile (the thoracic segments are 

 also somewhat retractile in the Macro -Psychid larvae, but not in the 

 marked manner observable in T. tubulosa). The thoracic segments all 

 taper backwards considerably to allow of their being retracted ; they 

 have conspicuous shiny corneous shields, but there is a gap between 

 the dorsal and lateral plates of the meso- and metathorax ; the pro- 

 thorax is black, like the head, the meso- and metathorax are dark 

 brown. The true legs are corneous, brown, bearing some relation to 

 the size of the thoracic segments. Abdomen. — The abdominal segments 

 increase from 1 to 4, the 4th-7th are about equal, the posterior seg- 

 ments tapering to anus less rapidly than in the higher Psychid larvae. 

 The skin of the abdomen is rather shiny, and bears rather large 

 chitinous plates at bases of tubercles, but these are not very apparent 

 on account of their transparency. The prolegs themselves are short, 

 but the hooks are large and strong ; the hooks are arranged as in the 

 larger Psychid larvae, except that on the anal claspers, the arrange- 

 ment is not so circular, but rather that of a portion of a narrow oval, 

 similar to the arrangement on the 1st, 2nd, 3rd and 4th pairs, but not 

 nearly so complete. The segments appear to be divided into two sub- 

 segments, but the separation is not distinct. The tubercles themselves 

 are rather more conspicuous than is usual in Psychid larvae. They 

 are small, dark in colour (not black), the plates at base are large, 

 the setae fairly distinct, i is small, ii larger, i and ii of almost 

 equal distance from the medio-dorsal. The way in which i and 

 ii are situated on the plates is interesting ; the plate on which i is 

 placed is on the 1st subsegment, long, placed transversely, and narrow, 

 the edges of the right and left plates nearly meeting in the medio- 

 dorsal line ; that on which ii is placed is on the second subseg- 

 ment, triangular in outline, with its point towards the medio-dorsal 

 line, but the inner point is not much nearer to centre than the outer 

 edge of plate i. Tubercle i is placed on the extreme outer edge of its 

 plate (i.e., as far out as it can be and still remain on the plate), ii is 

 placed on the extreme inner edge of its plate (i.e., as near the middle 

 of the dorsum as it can be without going off the plate). (The phylo- 

 genetic value of these tubercles has been discussed, ante, pp. 132-3.) 

 Tubercle iii is supraspiracular, the two subspiraculars iv and v are 

 present, v anterior to iv and much smaller. The spiracles are small, 

 round, slightly raised and standing out rather distinctly. The lateral 

 flanges are well developed [Bacot. Described April 30th, 1899, from 



* Between the clypeus and epicranium, on either side, is a somewhat narrow 

 quadrangular piece, which is preserved in the Luffiids, but hardly noticeable in 

 higher Psychids. 



