GROUPS AND FAMILIES 59 



projecting inner margin. The larvae have only ten 

 legs, only a few species showing an additional pair of 

 ill-developed ventral feet, hence their peculiar looping 

 motion in walking. 



5. The PYRALIDINA. This group, which is itself 

 capable of being subdivided into two distinct sections 

 (the Pyralideous and the Crambideous), contains 167 

 British species. The antennae are setaceous, very rarely 

 pectinated, more than twice the length of the thorax ; 

 the body is slender, elongated ; the legs are long, the 

 posterior pair longer than the others ; the wings are 

 rather long, triangular (in the Pyralideous section), or 

 subparallel (in the Crambideous section), with mode- 

 rately long cilia, the posterior wings adorned with 

 markings (in the Pyralideous section). Larvae with 

 sixteen legs, generally glassy-looking. 



6. The TORTRICINA. This extensive group comprises 

 no less than 299 British species. The antennae are 

 setaceous, much longer than the thorax, very rarely 

 ciliated ; the body is moderately thick, posteriorly 

 rather blunt ; the wings are broad, with moderately 

 long cilia ; the anterior wings are somewhat truncate 

 posteriorly, and often have the costa abruptly convex at 

 the base ; the posterior wings are rather broad, trape- 

 zoidal, without markings. The larvae have sixteen legs. 



7. The TINEINA. This group, which contains the 

 smallest known forms of Lepidopterous insects, is very 

 rich in the number of species, no less than 669 occur- 

 ring in these islands. The antennae are setaceous, 

 rarely pectinated or ciliated, longer than the body ; the 

 body is slender ; the wings are elongate, with long or 

 very long cilia (the length of the cilia is probably the 

 most distinctive character of the Tineina ; indeed there 



