105 



The Imago. — The mature insect whicli is represented enlarged in this model is 

 elongate, blaekish, and with numerous iiairs, or pubescence. Its length is about 

 three-twentieths .if an inch. The outer w ings are whitish, with a strong distinctive 

 black spot. 



THE SAN JOSE SCALE. 



Aspidiotus j)ermciof<us Comst. 



Ten enlarged models are e.Khibited 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 fumigation or spraying. 



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

 crawling larva, nearly full-groivn larva, male pr-o-pupa, male pupa, adult male, adult 

 female, and of the lialf-groivn scale, full-grown male scale, nn<\ full-grown female scale. 



THE ASIATIC LADYBIRD. 



Chilocorus similis Kossi. 



Two enlarged models are exhibited illustrating the adult and the larva of this 

 insect, which was introduced by the V. S. Department of Agriculture from China, 

 where it is the important agent in keeping the San Jose scale in check. 



THE CODLING MOTH. 



('arpocapsa puuiunella Linn. 



Four enlarged models illustrating the life history of this insect, whicli is the cause 

 of the "wormv apples." The damage from it in this country is estimated at 

 $11,000,000 annually. 



Models are exhibited of the larva and of the adult moth; and also an enlarged sec- 

 tion of a piece of hark, cut so as to show a cocoon and pupa of the codling moth 

 beneath it, and an enlarged section of "wormy" apple showing egg, young and 

 mature larva and their work. 



THE MEXICAN COTTON BOLL WEEVIL. 



Anthonomus grandis Boh. 



Enlarged model. This insect is a native of Cuba and Mexico; upwards of ten 

 years ago the weevils crossed the Rio Grande near Brownsville and have now spread 

 over nearly the entire cotton belt of Texas and into the western parishes of Loui- 

 siana. Its rapid exten-sion, great destructiveness, and the unusual difficulties in the 

 way of its control have caused grave fears for the future of the cotton industry in the 

 United States. The Federal (Government last year api)ropriated $250 000 for com- 

 bating this insect. 



THE HONEY BEE. 

 Apis mellifera Linn. 



Enlarged models, showing the insect in six different forms — queen, male, wax- 

 worker, worker, bee with propolis, and the bee with pollen. In these are shown 

 the external and internal characters which distinguish each type. Also a model of 

 a comb in the same proportion, in which are seen the cells for honey, for pollen, 

 and for the eggs to produce queens, drones, and workers, with eggs, larv;e, and puptn 

 in different stages of development. (After Auzoux. ) 



FLUTED SCALE. 



Icerya purcJiasi Mask. 



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 appearance of the infested plant. 



Model oe Noninfested Or.\nge. — The model in wax contrasts with the one repre- 

 senting the characteristic appearance of infested ])lant. 



Illustrations from the publications of the Division of Entomology, representing the 

 different stages of the fluted scale and its principal enemies. 



