48 ARTHROPODS 



B. Size small ; bodies wasplike ; wings more or less transparent ; 

 day fliers. 



Peach borer, ash borer, squash borer, Aegeridae. 

 C. Size medium; head large, free; antennae filiform or pec- 

 tinate, sometimes slightly clavate Zygaenidae. 



D. Body large or medium, thick, wooly; head small and 



sunken; antennae pectinate, more or less, and placed higher 



on the head than usual.. .Spinners, silk worms, Bombycidae. 



E. Body thick; thorax and abdomen often with dorsal 



tufts; antennae setiform or slightly pectinate; wings 



folded rooflike in repose. .. .Cut worm moths, Noctuidae. 



F. Body slender ; scales fine ; wings broad, thin, spread 



out flat in repose; antennae usually pectinate; palpi 



small Span worms, Geometridae. 



G. Palpi in most species long and compressed, beaklike ; 

 wings deltoid in repose, or in some rolled around 



the body Pyralidae. 



H. Small moths; palpi short, beaklike; fore wings 

 (primaries) oblong, with a prominent " shoulder," 

 and crossed by bands which are som.etimes metallic. 

 Leaf rollers, Tortricidae. 

 I. Size small or minute; antennae long, setiform; 

 wings pointed, heavily fringed on posterior mar- 

 gin Fur and grain moths, Tineidae. 



J. Primaries narrow, bifid or trifid ; secondaries 

 trifid Plume moths, Pterophoridae. 



The moths are sometimes called " nocturnals," or night 

 fliers, with the exception of Sphingidae, which fly in twiHght 

 or daytime, and Aeegridae, which fly by day. 



The butterflies, on the other hand, are called " diurnals," 

 as they fly only by day. 



The Lepidoptera are to be esteerned as injurious insects. 

 The only exception is the silkworm, which is, like the others, 

 a plant feeder. 



For tracing butterflies and moths to their genera and 



