28 MODERN ARRANGEMENT OF 



antennae of the males always pectinated, and terminated by 

 a simple filament. 



1. Spiral trunk very short and indistinct. 



It has but one genus, CERURA. 



2. Spiral trunk distinct, perceptibly prolonged when unrolled 

 beyond the palpi. 



The genera are DICRANOURA and PLATYPTERYX. 



III. The caterpillars always living exposed, and with sixteen 

 feet, the anal ones never wanting. 



1. Having almost no spiral trunk, or very short, concealed be- 

 tween the palpi, and useless in manducation. 



A. Caterpillars never forming a portable tube of vegetable mat- 

 ters. 



a. Caterpillars elongated ; upper part of the skin of the segments 

 not forming a vaulted arch over the body. 



* All the individuals with wings proper for flight. 



The genera are NOTODONTES and SERICARIA. 



* * Females apterous, or without wings. 



It has but one genus, ORGYA. 



b. Caterpillars oval ; upper part of the skin beginning at the 

 second ring, forming a solid arch, under which the head and 

 the first segment may be retracted ; feet scaly, retractile, the 

 membranous ones exuding a viscid fluid. 



It has but one genus, LIMACODES. 



B. Caterpillars inclosed in portable tubes, which they form with 

 fragments of vegetables, and bind together with their silk. 



2. Spiral trunk very apparent, projecting beyond the palpi, and 

 proper for suction. 



The genera arc CHELONIA and CALLIMORPHA. 



Genus Cossus, Latreille. 

 Having no tongue ; exterior palpi cylindrical, rather 



