38 THR ENTOMOLOGIST. 



THE EARLIER STAGES OF CATACLYSTA 

 LEMNATA, L. 



By T. A. Chapman, M.D. 



(Concluded from p. 5.) 



The newly-hatched larvse are l'5-2'0 mm. long, according to 

 the degree to which they are extended ; they have hairs appa- 

 rently in precisely the same positions as the older larvae, but the 

 principal setae are very long, II and III being more than half the 

 diameter of the larva in length, and the middle pair on the anal 

 plate three times as long, viz. about 0*3 mm., the others being 

 about 0*1 mm., and I about 0*07 mm. The circlet of hooks 

 on the prolegs contains about eighteen crochets, all of about 

 the same size, and not in two or three lengths as in the older 

 larvae. 



In an older larva the thoracic plate possesses at its anterior 

 border three pairs of hairs, much like those on the next two seg- 

 ments, but has also one towards the middle at its dorsal and 

 another at its outer edge, and there is one in the posterior half- 

 tinted border. On the first abdominal, I is on one side dupli- 

 cated, a rare variation. I, II, and III are in usual position, 

 Ilia, is wanting, but is present as a very minute point on the 

 following segments. IV+V has the posterior and smaller mem- 

 ber the higher, a character apparently common to all Pyraus- 

 tidae, and the reverse of what occurs in Pyralidae and Phycitidae. 

 Below these, first abdominal has two hairs at regular intervals; on 

 second the first of these has a companion above and behind it ; 

 on third the lower of these is represented by the usual three 

 hairs above and one below the proleg. The anal plate is rounded, 

 and has three hairs down each side. Ninth abdominal has four 

 hairs in line, the third hardly visible ; they range with and mav 

 be I, II, III, and IV+V. 



The prolegs have a complete circle (or oval) of crochets, of 

 which the inner and outer ones are closely set and nearly of a 

 size, but the anterior and posterior have the alternate ones of 

 more than double the size of the others, to the number of three 

 or four on each margin. The claspers have about seven large 

 hooks anteriorly, with smaller between, and beyond these at 

 either end they dwindle away to mere points in about a dozen 

 crochets, slightly alternate in size. On both prolegs and claspers 

 are a few points here and there, as if representing a third class 

 of still smaller crochets. 



The general surface is covered with very minute black points, 

 to which, in fact, the dark colour of the larva is due ; these are 

 ranged or massed in some degree more densely in zones, so as 

 to suggest three subsegments in each segment, the anterior 



