28 MODERN ARRANGEMENT OF 
antenne 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. 
IIL. The caterpillars always living exposed, and with sixteen 
feet, the anal ones never wanting. 
1. Having almost no spiral trank, 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 Noroponves and SericaRta, 
** Females apterous, or without wings. 
It has but one genus, Oreya. 
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, Limacopes. 
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 are Cuevonra and CaLuimorrna. 
Genus Cossus, Latreille. 
Having no tongue ; exterior palpi cylindrical, rather 
