YRAUSTID^. i6i 



the base ; eyes naked, and without lashes, generally rather 

 prominent ; tongue usually present and useful ; labial palpi 

 almost always distinct, often elongated and porrected; maxil- 

 lary palpi usually present, often noticeable, and tufted ; head 

 fairly smooth ; thorax in most species slender, smooth, with- 

 out crests, but with the shoulder lappets well developed and 

 long ; abdomen generally slender, devoid of dorsal crests, 

 but having the lateral tufts perceptible, and the anal tuft 

 usually rather long. Fore wings either trigonate and rather 

 pointed ; or cleft and pointed ; or else elongated and narrow ; 

 vein 5 arising from the lower angle of the cell. Hind wings 

 usually ample, thin in texture, and folded well beneath the fore 

 wings when at rest ; but cleft where this is the case with the 

 fore wings ; usually plain. In these wings is situated the 

 structural character by which the group is most reliably 

 recognisable — the nervure nearest the front margin, known 

 as vein 8, is depressed at a short distance from its base so as 

 to closely approximate to vein 7, and even in some groups to 

 combine with it beyond the cell, afterwards again separating 

 before the hind margin ; the three divisions of vein 1 are 

 present and usually well developed ; vein 5 almost always 

 arises from the lower angle of the cell. 



Larv^ with sixteen legs. 



PuPiE not protruded from the cocoon (if any) on 

 emergence. 



SECTION 1. 



Fore wings trigonate — Pyrcditcs. 



Family 1. PYRAUSTID^, 



Fore v; ngs rather narrowly trigonate, somewhat pointed; 

 vein la. arising separately from 16. ; v. 7 springing from the 

 cross-bar. Hind wings with veins 4 and o arising from 



VOL. J.X. L 



