40 ARTHROPODS 



B. Antennae short; tarsi three- jointed; supposed organs of hear- 

 ing situated in the first abdominal segment; ovipositor short, 

 composed of four separate plates; stridulating organs situated in 



hind femora and the costal area of the tegmina Acrididae. 



BB. Antennae long, setaceous; tarsi four or three-jointed; sup- 

 posed organs of hearing situated in the anterior tibiae, and also 

 in the presternum; ovipositor elongated (except in the Mole 

 crickets) ; composed of four connate plates. 

 C. Tarsi four-jointed; ovipositor (when exerted) forming a 

 strongly compressed, generally sword-shaped blade ; the strid- 

 ulating organs of male limited to the anal area of the tegmina. 



Locustidae. 



CC. Tarsi three-jointed; ovipositor (when exerted) forming a 



nearly cylindrical, straight, or occasionally up-curved needle; 



the stridulating organs of the male extend across the anal 



and median areas of the tegmina Gryllidae. 



THE BUTTERFLY 



External Features. — The cabbage butterfly ( Pieris 

 rapae) or the yellow sulphur butterfly (Eurymus philodice) 

 are suitable specimens for study. Gather several from the 

 open places or gardens and note the flowers on which they 

 feed. 



(i) Observe the distribution of colors over the body. 

 Do you find a definite arrangement of colors? 



Do you find the three divisions of the body? What are 

 the characteristics of each? 



(2) Notice the shape and length of the !Intenng£; how 

 many segments ? On the lower side of the head find the coil- 

 ed proboscis, or tongue. Uncoil it with a needle or with the 

 tweezers. The tongue is made of the galeae of the maxillae. 



