AGRIADES THETIS. 363 



brood reared last; year from ova deposited in captivity were kept under 

 conditions which certainly precluded the possibility of their aid 

 (Kay ward). Prideaux observes (in litt.) that the few larvae he has 

 found in nature have been unattended by ants. Wood notes (in litt.) 

 that he has observed both Formica riifa and Lasius flavus attending the 

 larvae in nature. 



Larva. — First instar (full-grown): About 2mm. in length ; w T ith a 

 marked angular outline when seen from the front, the dorsal and 

 lateral flanges carrying long hairs ; these hairs are colourless or nearly 

 so, their bases nearly black, and very abundantly clothed with fine 

 spicules, so fine that, without considerable magnification, the hairs 

 appear to be smooth ; the seta of i is a long hair, 0*2mm. to a 33mm. 

 (on 8th abdominal), with a strong curve sweeping backwards, except 

 those on prothorax and front hairs of mesothorax (if these can be 

 called i, they range with them); that on ii is a short (007mm.) and 

 nearly straight hair, arising close to and behind the base of i ; each 

 segment has three lateral (subspiracular , iv and v ?) hairs, the middle 

 one the longest (about O02mm.), the posterior short and of clubbed 

 form (about 05mm., much shorter than the similar hair in the larva 

 of A. coridon same stage where it is about 0-075mm. long). The hairs 

 corresponding with tubercle iii require special notice — on one side of 

 a particular specimen, this hair exists on the metathorax and on the 1st, 

 2nd, and 3rd abdominals singly (the anterior of the usual pair), on the 

 4th abdominal are two, and on the 5th, 6th, and 7th abdominals one, 

 wanting on the 8th abdominal; this anterior hair has an obvious base, 

 but the hair itself, especially in preserved specimens, is very trans- 

 parent and easily overlooked, it is a very broad, club-shaped, almost 

 balloon-shaped, hair, 0-03mm. long and about half as broad, the 

 second hair on the 4th abdominal is apparently only a base ; on the 

 other side of this specimen the second hair (base only) is present on 

 the 1st, 3rd, 4th, 5th, and 6th abdominal segments; in another 

 specimen it is on the 2nd, 3rd, 5th, and 6th abdominal segments on 

 one side, on the other on the 2nd, 3rd, and 4th abdominals ; in several 

 cases it carries a hair just a little smaller than the front one. [In the 

 larva of A. coridon at this stage, both hairs are much more usually 

 present and the hairs are larger and much more easily observed, the 

 forward hair is nearly as large again as that in A. thetis (bellargus) 

 and the posterior one at least as large as the anterior one in the latter 

 species.] On the prothorax, the plate is rounded in front, angular 

 behind (a quadrant with the angle rounded); it has, in front, two 

 large lenticles, with a pair of small hairs between them (wan ting- 

 sometimes), a pair of long hairs near the middle, and another pair, one of 

 which is at about the middle of each latero- posterior margin ; the special 

 angular hair seems slightly thickened, spiculated, and comparatively 

 short; there are the usual three hairs along each front margin of the 

 plate, and a fourth in line with them beyond its angle with three in front 

 of the spiracle. The mesothorax has, in front of w T hat look identical 

 with the setae of i and ii on the following segments, two long hairs 

 with a lenticle between them, the inner long hair looking like i curved 

 forwards ; there are four flange-hairs and one at base of legs. On the 

 metathorax and the lst-7th abdominal segments is a small hair at the 

 margin of the segment in front of l ; most of these segments have two 

 short thin marginal hairs (between flange-hairs and prolegs, when 



