Ill 



gall-making insects, the gall-makers belonging to the Order of Two- 

 winged Flies (Diptera) forming about the only exception.* 



Of course it would be premature to talk of any remedy against 

 the depredations of this elegant little jewel of a moth, until we know 

 for certain whether as I suppose she is a Guest in the Plum, and con- 

 sequently a neutral; or whether she burrows into the Plum on her 

 own account, and is therefore to be treated as an enemy. J hope that 

 — as will sometimes happen both with Eastern and with Western 

 juries — the beauty of the fair defendant has not warped my judg- 

 ment, and induced me to bring in a verdict of "Not guilty," when, in 

 reality, she richly deserved to be sent to the Penitentiary. 



INSECTS INFESTING GAEDEN-CKOPS GENERALLY. 

 CHAPTER XIV. — The Hateful Gkasshopper, (Caloptenus spretus, Walsh.) 



This insect, as will be seen hereafter, is about seven times as de- 

 structive to garden crops, as it is to field crops ; and it, therefore, falls 

 legitimately within the purview of this Eeport. It has never yet, 

 so far as is known, invaded this State; and I do not believe that it 

 ever will or can. Still, as many of our farmers and gardeners in Illi- 

 nois have an idea, that it may not improbably, at some future time, 

 pass from Missouri and Iowa into Illinois — just as the notorious 

 Colorado Potato-bug {Doryphora IQ-lineata, Say) has done — it may 

 be worth while to investigate its Natural History, and to demonstrate 

 the improbability of its ever crossing the Mississippi in the course of 

 its Eastward progress. It is the province of Economic Entomology, 

 not only to forewarn the Agriculturist of the approaching insect foe, 

 but also to dissipate any groundless fears of such a foe that may 

 prevail, when it can be proved that such fears are really groundless. 



In Wxe Practical Entomologisi for October, 1866, (II., pp. 1 — 5,) 

 I investigated the migration of this Hateful Grasshopper, from the 

 canons (kanyons) of the Eoeky Mountains, into the lowlands of Kan- 

 sas, Nebraska and Western Missouri, which had just then taken place. 

 I further stated my belief that the eggs, which had been that autumn 

 deposited by the females in the ground throughout the infested region 

 in countless myriads, would not generally hatch out that autumn and 

 be destroyed by the frosts — as many fondly anticipated — but that the 

 great bulk of them would lie safely in the ground through the winter, 

 and hatch out as the spring of 1867 opened; when, in all likelihood, 



*See my Papers Pioc. Ent. Soc. Phil., I. pp. 461—2; III., p. 635; VI., 

 p. 277. 



