1891.] 



NEW-YORK MICROSCOPICAL SOCIETY. 



129 



hairs, about twenty-four in number, averaging in length about 

 twice the diameter of the femur, projecting backward at right 

 angles with the axis of the femur, each hair being slightly hooked 

 at its distal extremity. The tibia of each middle leg is furnished 

 with a row of about sixteen hairs, somewhat resembling those of 

 the femur, excepting that they are shorter, more curved, more 

 prominently hooked, and in that they extend 

 only about one-half the length of the tibia, be- 

 ginning at the proximal end. The femora of 

 the posterior legs are so curved inwardly that, 

 when opposed to each other, they form a 

 nearly completed circle, and are each fur- 

 nished with a tuft of stout hairs on their inner 

 opposed surfaces. The tibiae of the posterior 

 legs are each furnished at the proximal end 

 with a stout projection, turned at an angle 

 inwardly, like the barb of a fish-hook, and 

 each barb is surmounted by a stout, flexuous 

 spine. These tibise have also each a slender 

 pencil of long hairs about midway on their 

 inner surfaces, and projecting backward at 

 an acute angle with these surfaces. The last 

 joint but one of the tarsi of the middle legs 

 is furnished with two, and the corresponding 

 joint of the posterior legs is furnished with 

 three, long, diverging bristles. The entire 

 length of the larva, from the curve of the de- 

 fiexed palpi to the extremities of the long 

 middle legs, when these latter are projected backward, is about 

 three- eighths of an inch, and the length of the body from vertex 

 to anus is a little less than one-eighth of an inch. 



Unknown aquatic larva. 

 Magnified lo diameters. 



Meeting of June 5TH, 1891. 



The Vice-President, Mr. J. D. Hyatt, in the chair. 

 Eighteen persons present. 



The Corresponding Secretary announced the death of Mr. 

 Charles W. Brown, a Resident Member of the Society. 



