SERICORID.E—BACTRA. 129 



Genus 22. BACTRA. 



AntenniB thick ; palpi thick, short, but protruding ; thorax 

 smooth, fore wings narrow, pointed, but not hooked nor 

 squared; costa not folded; hind wings rather pointed, not 

 tufted. 



We have two species. 



A. Fore wings very plain, narrowly trigonate. B. lanceolana. 



A?. Fore wings mottled with dark markings ; narrow and 



strap-shaped. B. fitrfurana. 



1. B. lanceolana, Hi'ih. — Expanse h to f inch (12- 

 20 mm.). Fore wings elongate-trigonate, pointed, pale drab, 

 yellow-brown, or grey-brown ; without markings or with two 

 dashes in the middle of the disk, or a longitudinal dark shade 

 through the middle of the wing. 



Antennae black-brown, barred at the back with white ; 

 palpi, head, and thorax drab, shaded with brown ; abdomen 

 blackish brown ; anal tips yellowish. Fore wings large and 

 rather narrowly trigonate, costa very flatly arched and not 

 folded, a]3ex sharply pointed, hind margin oblique ; drab 

 yellow-brown, or pale grey-brown, often without markiugs, 

 sometimes with only a dark brown stripe occupying the 

 middle of the wing from the base to the apex, sometimes in 

 this, near the base, is a wedge-shaped black spot, beyond it 

 on the disk a similar thick curved streak, and beyond, close 

 to the hind margin a row of rough black dots, and a brown 

 cloud running into the apex ; cilia drab. Hind wings and 

 their cilia smoky brown. Female similar, except that the 

 fore wings are a little narrower. 



Underside of the fore wings leaden brown ; of the hind 

 wings leaden white. 



Exceedingly variable in the depth of ground colour and m 

 the shade of the longitudinal brown stripe, when present, as 

 well as in the presence or absence of the few markings above 



VOL. XI. I 



