54 THE CANADIAN ENTOMOLOGIST. 



small depressed areas that are at first somewhat darker in colour 

 than the rest of the epidermis and later turn brown; in still other 

 cases the injury inside the fruit is so severe that the whole apple 

 becomes much distorted and unfit for use. This last kind of 

 injury is not nearly so common as either of the others. 



Imperfect Fertilization.— If during the blossom period one 

 or more of the pistils of the fruit fails to be fertilized the result is 

 often a lop-sided or malformed fruit. 



Spray Injury. — Sometimes spray mixtures, especially Bor- 

 deaux, injures a portion of the epidermis of a young fruit and, if 

 the injury is sufficiently deep, will cause an interruption in the 

 growth of that side and consequently a deformity. The failure of 

 the surface over these injuries to keep pace with the growth of the 

 tissues beneath often leads to its becoming cracked. . 



A NEW SPECIES OF THE GENUS NEPHROCERUS. 



BY CHARLES W. JOHNSON, BOSTON, MASS. 



The determination of the two American species of this genus 

 has presented some difficulties owing to the dearth of material 

 and to their. close resemblance to some of the European species. 

 Through the kindness of Mr. Frederick Knab, I have been able to 

 study both sexes of A^^. daeckei and the specimen of the undescribed 

 species collected by Mrs. A. T. Slosson, on Mt. Washington, N. H., 

 in 1897. During the past two seasons six specimens of the latter 

 have been collected, thus giving ample material to define more 

 clearly our two species. 



The following table, including the three P2uropean species 

 will show some of the structural characters separating them from 

 the American species: — 



Table of Species. 



1. Last tarsal joints of all the legs without conspicuously long, 



bristly hairs, arista entirely black lapponica Zett. 



Last tarsal joints of all the legs with 4-7 long, bristly hairs 2 



2. Hind tibiae rather twisted, widened at the end, and with a 



circle of bristles at the tip flavicoruis Zett. 



February, 10!') 



