AGRIADES THETIS. 365 



assertion of the irregular distribution of hairs, etc., that accompanies 

 their great multiplication in the later stages ; the most remarkable 

 instance of this is a lenticle in the median dorsal line, generally to 

 the front of a segment, and a hair, similarly medio-dorsal, towards the 

 posterior margin of the segment. In a specimen taken at random 

 (others would doubtless differ), this lenticle is, on the mesothorax, in 

 the middle of the segment ; on the metathorax it is on the anterior 

 margin, as it is also on the remaining segments ; on the 6th abdominal 

 it is rather to the right side, on the 2nd to the left of the middle line, 

 on the 3rd much to the right, on the 4th to the left, on the 5th absent, 

 on the 6th to the right, on the 7th much to the left, on the 8th 

 wanting. The median hair is unmistakable; on the 5th and 6th 

 abdominal segments, it is wanting behind ; on the 4th it is to the left 

 side (but the other (accessory) dorsal tubercles are arranged in a 

 puzzling way) ; on the 3rd it is on the left side, on the 1st and 2nd it 

 has become a pair, one on either side ; if two (?) posterior tubercles on 

 the meso- and metathorax be the same, then it is wanting on the right 

 side on the meso- and on the left on the metathorax. Similarly, for 

 the lower hairs and lenticles, on going to the next segment to verify 

 exactly the position of a hair or lenticle, one finds it wanting, or 

 distinctly differently situated, and so on. To take the 2nd abdominal 

 segment as fairly typical, we find a large hair with large base, the hair 

 0-2mm. long, thick, and rapidly tapering, nearly black, and well- 

 spiculated, the base very much wider than the hair, much higher than 

 wide and rather bell-shaped ; this is the seta of i ; all the other hairs 

 are very similar except that they are very decidedly smaller; tubercle i 

 is rather behind the middle of the segment, ii is behind and outside 

 this, and of about half its length, perhaps, also, a little paler; inside 

 and in front of i is a hair a little larger than ii ; it may very well be 

 that the real setse of i and ii are this hair and the one I have called i ; 

 they occupy the more usual positions of i and ii, i.e., my i is behind 

 the middle of the segment and my ii very far back; on the other hand 

 i is much the stronger hair in the first instar. [A comparison Avith 

 the same stage larva of A. con'don, however, shows my i and ii to be 

 both strong hairs, the front one 1 to be clearly the accessory.] Then there 

 are the lenticles and paired hairs on the dorsum already noticed ; 

 going down now to the three flange-hairs (iv and v ?), now increased 

 to four or five and not all at one level, we find the spiracle one-fourth 

 of the way up the slope, with no intermediate structure; nearly another 

 one-fourth up and in the line of the spiracle is a large lenticle, below 

 this, a very small one (often wanting); in front of the lenticle is a 

 small hair (iii ?) (this hair is larger on anterior segments), below, and 

 in front of, which is another large lenticle ; in this line (slightly 

 sloping up, backwards) at posterior margin of segment, is a short hair; 

 between this and the dorsal set are two hairs (very short) one at each 

 margin of segment ; there is also a hair w T hich may be described rather 

 as belonging to the dorsal set in front of and outside i ; these last 

 three hairs vary in position in different segments and even as to being- 

 present. On the mesothorax (on either side) are four hairs at front 

 and four at hind margin more or less dorsal, then, at a small interval, 

 there are three hairs and a lenticle in front, at the level of the supra- 

 spiracular set of the abdominal segments, with six hairs in flange, one 

 above and in front, then three evenly spaced and two more below ; 



