XXXli, '21] ENTOMOLOCICAL NEWS 255 



or sometimes longer, until the hunger was satisfied. One squirrel could 

 therefore do considerable damage. Since that time the operation has 

 been seen many times." 



"Observations on Mites Infesting Flour and Mill Feed" by R. N. 

 Chapman, lead to the conclusion that to prevent a general outbreak of 

 these pests, the place must be kept "perfectly clean, permitting no accum- 

 ulations of flour and other material." S. A. Graham discusses the "Fac- 

 tors influencing the Subcortical Temperatures of Logs" with reference 

 to the destruction of wood-boring insects. W. C. Cook gives us "Studies 

 on the Flight of Nocturnal Lepidoptera," treated statiscally and cor- 

 relatively with meteorological factors. \Yilliam Moore deals with "The 

 Principles of Film-forming Sprays," while the greater part of the vol- 

 ume is occupied by two taxonomic papers : "Contribution to the Knowl- 

 edge of the Group Aphidina, Family Aphididae," by O. W. Oestlund 

 (pp. 63-75), with interesting remarks on the determination of relation- 

 ships and phylogeny in general, and "Alonograph of the North American 

 Species of Deraeocoris (Heteroptera, Miridae)," by Harry H. Knight 

 (pp. 77-210), in which 54 species and 22 varieties are recognized from 

 North America, 37 species and 20 varieties being described as new. The 

 bugs of this genus sometimes feed upon the sap of plants, but, in some 

 species at least, rather upon the aphids found on particular plants ; where 

 this latter habit prevails the immature forms are often "covered with a 

 white, powdery, flocculent material, and are thus in the early instars, 

 not readily distinguished from the aphids among which they live." A 

 hitherto unnoticed structure in the Miridae has been detected in this 

 genus a comb of spine-like teeth at the distal end of the fore tibia, 

 used for cleaning the rostrum and antennae. Keys applicable to both 

 sexes are given and the male genital claspers of each species are figured. 



The present report maintains the high rank which we arc accustomed 

 to associate with the Minnesota State Entomologists. P. P. CALVERT. 



Doings of Societies. 



The American Entomological Society. 



Meeting of June 7, 1920, in the hall of The Academy of Natural 

 Sciences of Philadelphia. Nine persons present, the President, Dr. 

 Skinner, in the chair. Mr. David F. Narrower and Mr. Frank R. 

 Ma-nii \\cre elected tn membership. 



I I Y VKNOPTKKA. Mr. Frost exhibited several insects in resin deter- 

 mined by Mr. Cresson as Andricnx scmhuilnr, Family Cynipidae. 



ORTHOPTERA. A few remarkable I'hasmids, or Walking-stick*, were 

 exhibited by Mr. Hebard, among which were / ", inlosoni^i /'<>/></ and 

 Burycarrtha horrida. The genus 'rhucnin was di^cus^ed. 



R. C. WM.I.I\M>, Recording .S'.v 



