EGG AND NEWLY- HATCHED LARVA OF BEENTHIS THORE. 



237 



the sides being rounded, and the outline passing in a regular curve on to 

 the top, which is rather flattened. The micropylar area is, indeed, in a 

 decided depression. The primary (longitudinal, upright) ribs are 

 prominent and rather sharp, and stand up, flange-like, round the 

 micropylar depression. Below the middle of the egg they are nineteen 

 in number in the only one actually counted. Round the micropyle they 

 are nine. They increase chiefly at about 0-15nim.-0-2mm. from the 

 top by an intermediate rib starting from the middle of a secondary 

 (transverse) rib. But sometimes a rib gives way to two, and sometimes 

 the origin is as low as half-way down. The secondary ribs are well- 

 marked fine raised lines, usually opposite each other on each side of 

 the (primary) ribs, and at intervals of about 0-04mra. The micropylar 

 rosette consists of about 11 cells, is about 0-025nim. in diameter, and 

 is surrounded by two rows of cells a little larger than those of the 

 rosette, there is then a third row of larger ones, which are followed by 

 the cells between the secondary ribs. Across these is about 0"12mm. 



The NEWLY-HATCHED LARVA. — This has a length of about 2-6mm. 

 when fully stretched, its width is about 0-4mm., and the length of the 

 hairs is 0-3mm. The head is black and the tubercles very dark, 

 nearly black, the hairs are dark, finely spiculated, and of very uniform 



Fir,. A. — Brenthis thore. — 1. Abdominal segment 2 of larva, x50 (top 

 ligure) showing sette i, ii and iii above spiracle, iv + v-j-vi and vii below spiracle. 

 2. Spiculated hair with swollen extremity X 130. 3. Part of same hair x 400. 



length. The tubercles (Fig. A, no. 1) have large chitinous plates com- 

 pletely covering the larva whilst it is small, and before it has become 

 expanded by feeding or otherwise. Each plate is about 0.08mm. wide. 

 Those of 1 and ii are flattened somewhat against each other (Fig. A., no. 

 1. X 50), i, li and iii carry one hair each. The spiracle is hardly tinted and 

 difficult to see. Below the spiracle is a very large tubercle carrying six 

 hairs (five only on a forward and backward segment or two) ; this 

 tubercle has the appearance of a rounded boss and the several hairs 

 cannot be dift'erentiated as being those of difterent tubercles (iv, v, vi, 

 etc.) Below this is a solitary tubercle with one hair. This terminates 

 the series of long hairs. Below, and at base of prolegs, are two shorter 



