HypoticmiB. 53 



was followed by a level of soft pale dermis, and then a larger ring of 

 chitin formed the summit of the conical projection. 



The ventral prolegs have a complete circle of hooks, and when 

 expanded, are regularly circular, but contract into an anterior and 

 posterior line, or into a triangle with anterior, posterior and outer 

 sides. The hooks (or crochets) are in two rows, the longer sharply 

 hooked and with long bases, are about twenty-eight in number ; the 

 shorter are between these, are very small, and range with the 

 proximal ends of the bases of the large ones. The anal prolegs 

 have the circlet of hooks largely wanting posteriorly. 



There is a large plate on 1st thoracic ; 2nd and 3rd thoracic seg- 

 ments have a subsegmentation of the complicated form common 

 to most Pyralids ; a central sabsegment carries the tubercles and is 

 much constricted dorsally, and the marginal ones merge before 

 reaching the spii*acular level. This subsegmentation is not nearly so 

 pronounced as in Pyndis. The abdominal segments (1-7 at least) 

 are divided into two nearly equal subsegments, or into four, if two 

 faintly-marked and narrow subsegments between the two larger ones 

 be counted as separate. 



The general surface has a finely granular or shagi-eened texture. 

 In places are small, circular, smooth, apparently depressed areas of 

 about the same size as the tubercles. The most conspicuous of these 

 is a row of four on each side of the middle line, along the anterior 

 mai'gins of the abdominal segments. These are frequent in Phycitinae 

 and Pijraustinds. 



Fupa of H. corticalis. 



From 7-8 m.m. in length. It varies in fact much in size, but less 

 in length than in thickness, a small ^ being 1'7 m.m., and a J 2"5 

 m.m. in width, but in length 7 and 8"3 m.m. respectively. Fairly 

 uniform throughout the thoracic mass, but tapering regularly from 5th 

 abdominal ; in the more robust specimens the tapering begins at 3rd 

 abdominal. The ventral aspect of the thoracic mass is fairly straight ; 

 the tapering towards head is done by dorsal rounding, from meta- 

 thorax forwards. 



There is no dorsal head piece, the face piece extends backwards 

 between the antennal bases. It carries two fine hairs opposite the 

 middle of the base of the antennse. At its oral margin a triangular 

 piece (labrum ?) projects with its lower angle rounded off and notched, 

 and on either side of this, and overlapped by it, is a small rounded 

 lappet (mandible ?). Laterally the eye-region is clearly marked off. 

 Immediately Ijelow the free margin of the labrum, the labium begins, 

 and for a third of its length is single, then divides ; its total length 



