14 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



rnm. long and with five sensoria; V, about 0.125 mm. long and VI base, 

 0.064 mm., unguis 0.352 mm. 



Described from two specimens reared during the summer of 1915. 



Eriosoma sp. 



In a collection of an undescribed species of Eriosoma from pears 

 in California made by W. M. Davidson, two intermediates are 

 present. These resemble the apterous forms greatly but the 

 eyes are composed of a large number of lenses. The apterous 

 forms have a very simple eye composed of three facets whereas 

 the eye of the alate form has many. In this intermediate nature 

 indicated by the eyes only, the present species resembles certain 

 species of Phylloxera. 



In discussion, Mr. Rohwer stated that he believed the absence 

 of wingless aphids in fossils could be explained by the method 

 in which the geological formations were laid down. He did not 

 believe that their apparent absence from fossils should be assumed 

 to mean that they were not in existence at the time the deposits 

 were formed. 



THE EUROPEAN FIR TRUNK BARK LOUSE (CHERMES (DREY- 



FUSIA) PICEAE RATZ.) APPARENTLY LONG ESTABLISHED 



IN THE UNITED STATES. 



BY JACOB KOTINSKY, 

 Forest Entomology, Bureau of Entomology. 



Recently the Bureau of Entomology of the U. S. Department 

 of Agriculture has received pieces of balsam fir bark rather 

 heavily infested with a Chermes, which careful comparison with 

 descriptions and figures has shown fairly conclusively to be 

 identical with the above named European species. The speci- 

 mens came from Mt. Monadnock, N. H. where, the correspondent 

 states, the infestation has been spreading during the past three 

 years and a considerable number of trees had died during the time. 

 This identification, when brought to Dr. Hopkins' attention, 

 reminded him of a Chermes he collected on bark of balsam firs 

 in the vicinity of Brunswick, Me., in August, 1908. A slide 

 preparation of this material showed it also to agree with Chervic* 

 piceae. The identification was based primarily on the integu- 

 mental structure of the 1st instar of the stem mother in which 

 form the insect hibernates on the bark and which presents the 



