178 BEITISH LEPIDOPTEKA. 



metathorax is of about the same measurement as one of the abdominal 

 segments. The head is large, rounded and partly retractile, dark 

 brown in colour, corneous in appearance, with some very long scattered 

 hairs ; similar hairs are also present on the thoracic segments. The 

 prothorax is lighter in colour, but covered with a corneous plate, the 

 mesothorax paler, also covered with corneous plates, the metathorax 

 appears to be covered with two dorsal plates and a separate lateral 

 plate on either side. The abdominal incisions are distinct, whilst 

 there is a fairly well-marked longitudinal lateral ridge. The hairs are 

 proportionately larger than in the adult larva, but not so long as in the 

 1st instar of the Macro-Psychid larva?. The ventral surface of the 

 abdomen is rather flat, the prolegs (on abdominal segments 3-6 and 

 10) short. The dorsal tubercular hairs consist of a rather short one on 

 the anterior trapezoidals (i), and a larger one on the posterior trapezoidals 

 (ii), i is nearer the median line than ii; iii bears a very long supraspira- 

 cular hair nearly half the diameter of the larva in length ; iv and v are as 

 in all other Psychids (v small and iv larger) , v is also rather lower than 

 iv, although they are somewhat close together ; vi and vii are single, 

 somewhat close together, the latter at base of proleg. The nervous 

 system is very well developed and obvious. [Bacot, May 24th, 1899, 

 described from newly-hatched larva from eggs laid by parthenogenetic ? 

 from Wellington College.] De Geer states that the newly-hatched larva?, 

 although very small, are really " large compared with the size of the ? 

 imago. They are yellowish-white, with large brown head, and the 

 three thoracic segments coloured like the head, are large and covered 

 with a corneous shield. The abdominal segments membranous. The 

 true legs very large (and enable the larva to walk very rapidly), the 

 prolegs of little service. The head and body are sprinkled with 

 many long hairs." The full-fed larva has the head small, partly 

 retractile, with black and polished surface, and rather long but slender 

 scattered hairs. The prothorax and mesothorax chitinous, glassy in 

 appearance, dark brown in colour (lighter than head) ; metathorax 

 brown, with chitinous plates, but less armoured than the pro- and 

 mesothorax. The prothorax is wide and chitinous, the mesothorax 

 rather less completely so, a slight gap existing between the lateral and 

 dorsal plates. There is a slight tendency to a constriction or neck 

 between the pro- and mesothoracic segments. The abdomen appears 

 very soft and bulky, the 2nd to 7th segments are about equal as regards 

 width (front to back), but the 3rd to 6th are of much greater diameter 

 (side to side), the abdomen tapering rather rapidly to anus, more 

 gradually to head. The anus is much curved ventrally, the posterior 

 edge of the 8th and the 9th abdominals being smoky in colour, whilst 

 the 10th bears black chitinous plates. The spiracles are small, circular, 

 pale brown, with a raised rim, the prothoracic placed somewhat pos- 

 teriorly on segment, the abdominal more centrally. The dorsal 

 tubercles are — i, extremely minute, ii, much larger and almost behind 

 i, both bearing a single hair (not placed so far forward as in Pachythelia 

 villosella or Lvffia lapidella) ; each of the abdominal segments appears to 

 be subdivided into two subsegments, of which tubercle i is on the 

 anterior and ii on the posterior. A long supraspiracular hair arises from 

 iii (which is close down to the spiracle) , and there are two subspiracular 

 hairs, one each on tubercles iv and v. The prolegs appear similar to those 

 of the larva? of Pachythelia villusella, Fumea, Epichnopteryx, &c. 



