VJ7 



CHINCH BUG. 



Jilinsiis I, iii-npli nis Say. 



The Eggs. — Tliis cnlaiucd model represents (lie form of tin- egg 

 and tlu^ tormiiial cai). 'I'lic i'*i*is arc thrci'-liundi'cdths of an inch long, 

 llic (o|) ln'ing s(|uar('ly docked and surronndcd l>\ fonr ronnd tul>crcles 

 near the center. Color from pale whitish to aml)er. 



FiKsr IjAKVAL Stack. This stage, represented enlarged in this 

 model, ditl'eis from the adult in heing more elongate and in having 

 two-jointed tai'si, the head hroadci- and more rounded and the joints 

 of the body subeiiual. The i)re\ailing cohn* of the whole l)otly is red. 



Skconi) Lauval 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 l)and across the middle of the bod}^ 

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

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

 alxiominal sutures, ;ind one at the tip of the abdomen. 



PiPA. — 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-pady, 

 which extend almost across the pale basal alxiominal 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 al)out three-twentieths of an inch. The outer 

 wings are whitish, with a strong distinctive black spot. 



THE SAN JOSE SCALE. 



Aspidiotux jirrnicioniis Conist. 



Ten eidarged models are exhibited illustrating the life cycle of this 

 I^est, 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 aie exhibited of the ^/ir.st and .second lui'val stages^ 

 of the young cnnolhu/ larva, nearly fiiU-ijroum larva, male pro-pupa, 

 male ])upa, adult nude, adult female, and of the half -grown scale, full- 

 grown male acale, nm\ fidl-grf^irn f //>>df sea/,. 



THE ASIATIC LADY-BERD. 



( 'liildcoriiK siiiiili.'< Ki>s.si. 



Two enlarged models are exhibited illustrating the adult and the 

 larva of this insect, which was introduced by t\w V . S. HepartiutMit of 

 Agricultun> from China, where it is the important agent in keei)ing the 

 San Jose scale in check. 



