MODERN ARRANGEMENT OP 



TRIBE III. NOCTURNA. 



All the wings are horizontal or inclined in repose ; 



the antennae are setaceous. 



With the exception of a small number, the lower wings in 

 this tribe are furnished with a bridle, formed by a strong and 

 sharp homy bristle, or a bundle of seta? adapted to a groove in 

 the upper wings, and keeping them horizontal when at rest. 

 The chrysalis is almost always inclosed in a cocoon rounded 

 before, or without angles. The number of membranaccous feet 

 varies in the caterpillar. 



FAMILY I. BOMBYCITES, Latreille. 



The antennae are pectinated or serrated, at least 

 in the males ; the trunk spiral and very short, 

 or almost none; body generally woolly anc 

 thick in the females ; wings often extended, anc 

 when they are inclined, the lower ones margin 

 the other two, or are turned up ; caterpillars pro- 

 vided with sixteen feet. 



I. Wings broad, either extended or inclined like a roof, the 

 lower ones in this case bordering the upper ; caterpillars liv- 

 ing exposed, on leaves. 



The genera are ATTACUS, LASIOCAMPUS, and BOMBYX. 



II, Wings oblong, narrow, always inclined, the lower ones en- 

 tirely covered ; caterpillars living in the interior of vegetables. 

 or concealed in the earth and gnawing their roots. 



This section has but one genus, HEPIALUS. 



Genus BOMBYX, Fabricius. 

 The wings are entire, horizontally extended or in- 



