the Tussch and Arrindy Silk-Worms of Bengal. 45 



Wings incumbent, expanded when at rest. Superior, or first pair, 

 falcated; prevailing colour brownish gray. A subdiaphanous, 

 curved, white, and rust-coloured band crosses from the centre of 

 the anterior (sector) margin to near the middle of the inner (slip) 

 edge ; from nearly the middle of which, on the inside, another 

 short, white bar runs to the posterior edge of the shoulder, and 

 one to the inner part of the sector edge, forming a dark angu- 

 lar spot in the centre of the junction of these two small bars 

 with the first-mentioned long one. Adjoining to the fore part 

 of this angular spot is a semilunar, somewhat pellucid speck, 

 with a yellowish centre. Near the rounded falcated apex of 

 each wing is a small dark-coloured eye, with the anterior mar- 

 gin thereof white. Their posterior margins are entire, and con- 

 cave towards the point, with a lighter-coloured border. The 

 inner margins are nearly straight and entire. Both the angles 

 are rounded. Inferior, or second pair, are nearly of the same 

 colour, with a whitish, horse-shoe-shaped belt near the centre, 

 opening on the inner, or slip edge; and inclosing a semilunar 

 spot, like that of the first pair. Exterior margins entire, convex, 

 with a somewhat waved, lighter-coloured yellowish border. 



Mr. Atkinson, who furnished me with the most interesting parts 

 of the history of Tusseh silk-worms, has also contributed most 

 of the following remarks on this species. 



They are, like the common silk-worm, reared in a domestic 

 state, and entirely fed on the leaves of the Palma Christi plant. 

 Their cocoons are remarkably soft and white, or yellowish ; the 

 filament so exceedingly delicate as to render it impracticable to 

 wind off the silk : it is therefore spun like cotton. The yarn, 



thus 



