132 JOURNAL OF THE [October, 



6. Section of eye of King Crab : by James Walker. 



Mr. Zabriskie said of his exhibits that these larvae of Gerris 

 are of different sizes and doubtless of different ages, some of 

 them being much smaller and all of them much plainer creatures 

 than the remarkable aquatic larva exhibited at the last meeting. 



The larva of the fly mining the leaves of the Red Cedar was 

 taken at Cypress Hills, Long Island, on April 25th last, and was 

 found only on this one occasion. The larva mines the base of 

 the leaf — usually the tenth or twelfth leaf from the tip of the 

 twig — causing an orange-colored, gall-like swelling. The mines 

 are usually scattered and solitary. Only in two instances were 

 larvae found at the bases of adjoining leaves. The larva is of a 

 bright orange color, about one-sixteenth of an inch long, stout, 

 head very small, and with the junctions of the abdominal rings 

 much constricted. Twenty-two specimens were found upon one 

 small branch of the tree. The larva was submitted to Dr. Charles 

 V. Riley, Entomologist-in-Chief, Washington, and he reported 

 it as "new to the National Collection." 



Meeting of June 19TH, 1891. 



In the absence of the President and the Vice-President, Mr. 

 Anthony Woodward was elected chairman. 



Sixteen persons present. 



Mr. Ernest Du Vivier was elected a Resident Member. 



Mr. George E. Ashby was elected Recording Secretary in 

 place of Dr. Bashford Dean, who was compelled to resign the 

 office on account of the pressure of other duties. 



The Recording Secretary read a paper by the President, Mr. 

 P. H. Dudley, entitled "Structure in Steel." This paper was 

 illustrated by six exhibits, as noted below, and is published in 

 this number of the Journal, p. 115. 



objects exhibited. 



Six specimens of Rail Steel : by P. H. Dudley. 



I. From the tire of a steel wheel ; very hard ; containing 64 

 of manganese, and showing the delicate matrix enclosing the 

 pseudo-crystals. Wheels of such steel have given a very large 

 mileage. 



