BY R. J. TILLYARD. 791 



enormous caliper-like mandibles, 0-7 mm. long, a similar but 

 slenderer pair of maxillae without palpi, and a suiall triangular 

 labium carrying a pair of four-jointed palpi. There are no teeth 

 on the mandibles. 



The segments of the thorax are slightly narrower than the 

 head, and subequal, the prothorax being the longer, but some- 

 what the narrower. The legs are short, the femora being fairly 

 stout, the tibi?e shorter and slenderer, and the tarsi veiy short 

 and unjointed. Distally, the tibiae are armed with a pair of 

 strong spurs. The tarsi end in a pair of short, strong claws, 

 between which there projects a long, slender empodium, ending 

 in an enlarged suction-disc, and closely resembling the same 

 structure in the larva of Chrysopidce. The larva is able to crawl 

 forward slowly, but prefers to walk backwards, which it can do 

 with considerable speed, using its anal papilla as well as its legs. 



The segments of the abdomen are nine in number, together 

 with a terminal anal papilla, which represents the reduced tenth 

 segment and the anal appendages. These segments are narrow, 

 and taper from before backwards. The whole of the abdomen, 

 as well as the head and thorax, is clothed with short, stiff hairs. 



The spiracles in the newly-hatched larva are eighteen in num- 

 ber, there being a pair upon the prothorax, and also upon each 

 of the first eight abdominal segments. They are, however, very 

 difficult to make out, the spiracular openings being small and 

 devoid of armature. 



When first hatched, the larva is semi-transparent, with very 

 little colour-pattern. Later it darkens to a greyish-brown, which 

 tends to become overlaid with a whitish pruinescence. These 

 changes become more marked in the following instars. 



At the end of the first instar, the larva has about doubled its 

 length, and the segments of the thorax and abdomen have 

 increased greatly in width and length, so that the head now 

 appears very small in comparison. 



As soon as the cold weather sets in, in May or June, the larva 

 ceases to feed, and remains motionless, hiding away in a crevice 

 of the bark, until the warmer weather begins in September. It 

 then becomes active again; but, after one or two good meals, it 



