127 



CHINCH BUG. 



Blissus leucopterus Say. 



The Eggs. — This enlarged model represents the form of the egg 

 and the terminal cap. The eggs are three-hnndredths of an inch long, 

 the top being squarely docked and surrounded by four round tubercles 

 near the center. Color from pale whitish to amber. 



Fiest Larval Stage. — This stage, represented enlarged in this 

 model, differs from the adult in being more elongate and in having 

 two-jointed tarsi, the head broader and more rounded and the joints 

 of the body subequal. The prevailing color of the whole body is red. 



Second Larval Stage. — After the first molt the form represented 

 in this enlarged model is assumed. The red becomes a brilliant ver- 

 milion and contrasts with the pale band across the middle of the body, 

 while the head and prothorax are dusk} 7 and coriaceous. Two broad 

 marks appear on the mesothorax and the second, fourth, and fifth 

 abdominal sutures, and one at the tip of the abdomen. 



Pupa. — The pupa shown in this enlarged model 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. 



The Imago. — The mature insect which is represented enlarged in 

 this model is elongate, blackish, and with numerous hairs, or pubes- 

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

 wings are whitish, with a strong distinctive black spot. 



THE SAN JOSE SCALE. 



Aspidiotus perniciosus Comst. 



Ten enlarged models are exhibited illustrating the life cycle of this 

 pest, which has caused more damage to the fruit industry and been 

 the object of more legislation than any other insect. Its small size 

 and inconspicuous appearance often leave it undetected until the 

 infested trees are beyond recovery. The scale may be killed by fumi- 

 gation or spraying. 



Enlarged models are exhibited of the first and second larval stages, 

 of the young crawling larva, nearly full-grown larva, male pro-pupa, 

 male pupa, adult male, adult female, and of the half-grown scale, full- 

 grown male scale, and full-grown female scale. 



THE ASIATIC LADY-BIRD. 



Chilocorus similis Rossi. 

 Two enlarged models are exhibited illustrating the adult and the 

 larva of this insect, which was introduced by the U. S. Department of 

 Agriculture from China, where it is the important agent in keeping the 

 San Jose scale in check. 



