76 



liead broader and more rounded and the joints of the body subequal. 

 The prevailing color of the whole body is red. 



621. CHINCH BUG. 



Blissus leucopterus. 

 Second larval stage. 



After the first moult the form represented in the enlarged model is 

 assumed. The red becomes a bright vermilion and contrasts with the 

 pale band across the middle of the body, while the head and prothorax 

 are dusky and coriaceous. Two broad marks appear on the meso- 

 thorax and the second, fourth, and fifth abdominal sutures, and one at 

 the tip of the abdomen. 



622. CHINCH BUG-. 



Blissus leucopterus. 

 Pupa. 



The pupa shown in the greatly enlarged models approaches still 

 more nearly the form of the adult, and is not unlike the last larval 

 stage except in being darker and in the appearance of wing-pads, 

 which extend almost across the pale basal abdominal joints. 



623. CHINCH BUG. 



Blissus leucopterus. 

 The imago. 



The mature insect, which is represented greatly enlarged in papier 

 mache, is elongate, blackish, and with numerous hairs, or pubescent. 

 Its length is about three-twentieths of an inch. The outer wings are 

 whitish, with a strong distinctive black spot. 



624. FLUTED SCALE. 



Icerya purchasi. 



Model in wax of a twig of Orange infested with the Fluted Scale, 

 Icerya purchasi, copied directly from nature, the actual scales being 

 transferred to the model plant. Illustrates the characteristic apx>ear- 

 ance of the infested plant. (See No. 87.) 



624a. FLUTED SCALE. 



Icerya xmrchasi. 

 Model of non-infested Orange. 



This model in wax contrasts with the similar one (No. 024), repre- 

 senting the characteristic appearance of infested plant. 



625. FLUTED SCALE. 



Icerya purchasi. 



Illustrations from the publications of the Division of Entomology, 

 representing the different stages of the Fluted Scale and its principal 

 enemies. 



