18 ENTOMOLOGY 
generalized species). Prothorax small. Wings four, sim- 
ilar, membranous, clothed with scales, veins moderate in num- 
ber, cross veins few. Larve eruciform (caterpillars), phy- 
tophagous (almost never carnivorous), mandibulate. Some 
fifty thousand species have been described. Two suborders, 
not sharply separated from each other. 
Suborder Heterocera.— Antenne of various forms, but not 
terminating in a distinct knob or club. Frenulum usually 
Fic. 26. 
Molanna cinerea. A, larva; B, imago. x4 diameters.—After Fett. 
present. Chiefly nocturnal in habit. Example, Callosamia 
(Fig. 236). 
Suborder Rhopalocera.—Antennz simple, terminating in a 
distinct club and without conspicuous lateral processes. Fren- 
ulum absent. Diurnal normally. Examples, Papilio (Fig. 
27), Anosia (Fig. 243, A). 
14. Coleoptera.—Metamorphosis indirect. Mouth parts 
mandibulate. Prothorax large, as a rule. Wings four; front 
pair horny (elytra), meeting in a straight line; hind pair mem- 
branous, often folded. Larve thysanuriform or eruciform. 
Example, Hydrophilus (Vig. 28). About fifteen thousand 
species. 
