Chapter IX. 



INSECTS INJURIOUS TO THE WILD CHERRY, WILD PLUM, THE 

 THORN, CRAB APPLE, AND MOUNTAIN ASH. 



Although only comparatively few species of insects have as yet been 

 found to prey upon the wild cherry, on the wild plum, on the thorn and 

 wild apple, so that they are not subject to very considerable injury, 

 yet these trees are the original food-plants of a large proportion of 

 those which ravage our orchards, and particularly infest the apple, 

 cherry, pear, etc. We have paid but little attention to the insects 

 feeding on these trees, since they are of little consequence as shade or 

 ornamental shrubs or trees, and the lists here given will doubtless be 

 at least doubled, and it is possible that a number of well-known spe- 

 cies have by oversight been left out of our enumeration. 



The European (German) species of thorn (Crataegus) aflEord food to 

 one hundred and four species of insects, including one species of mite. 

 Of these there are twelve species of beetles, seventy-two of Lepi- 

 (loptera, while there are six species of saw-flies, the remainder being 

 Diptera and Hemiptera. 



INSECTS AFFECTING THE WILD CHERRY. 

 Prunus virginiana, P. serotina, etc. 



APFECTING THE TRUNK. 

 1. Cysiophorus verrucosus Oliv. 

 Order Coleoptera: family Cekambycid^. 



Mr. Harrington records the discovery of this longicorn in the wood 

 of the wild red cherry, and " he also found a large number of larvae 

 which I think were of the same species, as they occupied similar cavi- 

 ties to that of the beetle." (17th Rep. Ent. Soc. Ontario, 1887, 17). 



This beetle resembles Euderces, but the elytra are without ivory-like 

 spots, and the eyes are oblique, emarginate. 



2. The cherry-tree borer. 



^geria exitiosa Say. 



Mr. W. L. Devereaux, of Clyde, K Y., writes me that he has observed 

 this borer in the trunk near the ground and in the bark of the roots of 



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