DEPARTMENT OF INSECTS. 



193 



The total number of specimens given is somewhat misleading, because 

 occasionally, as in the Coccidae, a branch or leaf contains dozens, here 

 been counted as one, and so also of a larva, pupa, and imago, or pupa 

 and imago which are often counted as one. A group of parasites gre- 

 garious on a larva is also often counted as a single specimen. 



In addition there are to almost every species drawings, or figures, 

 specially printed from the woodcuts in my reports on the Insects of 

 Missouri or in the reports of the Department of Agriculture, which en- 

 hance the value of the collection and render it more instructive to those 

 interested in agriculture. 



Added to and forming a part of this collection are four unit boxes 

 containing samples of forty different insecticide substances, four unit 

 boxes containing forty-three different kinds of nozzles for spraying, 

 a box containing various kinds of fly papers, and two large cases con- 

 taining twenty-five different kinds of pumps, bellows, blowers, etc., for 

 applying poisons to plants. 



The collection of forestry insects is included in eight unit boxes, and 

 is arranged on a plan similar to that of the ])receding collection, the 

 insects affecting each tree being grouped so as to show the manner of 

 work. Like that collection, it is also profusely illustrated with figures 

 from the reports above mentioned. 



It contains as follows : 



Injurious to- 



Pine 



Evergreen 



Celtis 



Locust 



Aihiuthus 



Tulip tree 



Willow 



Poplar 



Magnolia 



Asli 



Sassafras 



Linden 



Persimmon 



Sweet-gum 



June or service berry 



Wild cherry 



Alder 



Pear or thorn 



Me.squito 



Papier mulberry 



Buuiclia lycioidcs ... 



Oak (galls) 



Oak 



Maple 



Hickory 



Elm 



Total 



H. Mis. 170, pt. 2 13 



