not yet attacked the Potato. This allied' species is so like the 

 true Colorado Beetle that an entomologist only could detect the 

 difference ; yet one species is extremely noxious and the other 

 harmless. Here we have illustrated the advantages derived by 

 oloselv allied species having been carefully described, and their 

 distinctions shown by the entomologist. 



No doubt the extension of the cultivation of the Potato to the 

 base of the Rocky Mountains has enabled the insect to reach the 

 most Eastern States by a vegetable bridge ; and I must say I dread 

 that the importation of potatoes from America will enable the 

 insect to bridge the Atlantic. Besides, I have this week read in a 

 horticultural publication that the more extended cultivation of the 

 Solan urn rostra I urn in England as an ornamental plant is recom- 

 mended. If this insect does arrive in England it will establish 

 itself, as other introductions from America, both animal and 

 vegetable, have done, particularly so as the range of the species in 

 the United States is so great both in latitude and longitude ; and 

 it appears to thrive better in. the Northern than the Southern 

 States. 



I find from the returns of trade that Potatoes are imported into 

 this country from the United States of America and from the 

 Dominion of Canada ; in a few years, therefore, the question will 

 be settled whether we are to be visited by the Colorado Potato 

 Beetle. I must confess that I entertain great anxiety on the 

 subject, as I find that the insect progresses onward in its migra- 

 tion more rapidly in the Northern States and in Canada than in 

 the more southern parts of North America. It is therefore pro- 

 bable that the climate of England would be favourable to its 

 existence, if once a footing is established ; and that it will shortly 

 be introduced I entertain no doubt. 



It has been proved that North American insects inhabiting the 

 temperate region can exist in England, and that British insects do 

 establish themselves and prove a pest in Canada and the United 

 States. 



Of the latter fact I could give several illustrations, but will 

 content myself with one. Our common small cabbage butterfly 

 has found its way into Canada. M. Provancher, writing in 1870 

 in " Ijc Naturiste Canadien," stated that since its arrival its larva 

 had done more mischief than those of all other noxious butterflies 

 put together in the same space of time — the value of the cabbages 



