ADDITIONAL NOTES ON THE GENUS PTEROCOMMA. 



By H. F. Wilson. 



The writer has published in the December, 1915, issue of 

 the Annals, a paper under title, "A Synopsis of the Aphid 

 Tribe Pterocomminiy Mr. J. J. Davis has called to my atten- 

 tion two citations not listed in my paper, both of which include 

 descriptions of new species. 



The first paper the writer does not have, but it was pubhshed 

 by Alexander Mordwilko in 1901, in Vol. 33, Hor^e Society of 

 Entomology of Russia. A new species is described as Cladobius 

 steinheili. 



Mr. Davis has loaned me one slide containing five specimens, 

 only one of which seems to be mature. The specimens are 

 similar to Pterocomma bicolor Oestlund, but may be a distinct 

 species. There were not a sufficient number of specimens 

 present to determine the species accurately. 



The second paper was by Miss Edith Patch in Bull. 213 of 

 the Maine Experiment Station in which Miss Patch describes 

 a species as new under the name of Melanoxantherium anten- 

 natum. This species is distinctly different from all of the other 

 members of this group in generic characters and does not belong 

 in the genus Pterocomma nor in the tribe Pterocommini. 



Mr. Davis also suggests that Cladobius rufulus Davidson is 

 a synonym of Pterocomma bicolor Oestlund rather than P. 

 populeus Linn. In this connection, I may say that these two 

 species or almost identically similar ones are found along the 

 Pacific Coast and they have both been confused under the 

 name of rufulus. Mr. Davidson also seems to have confused 

 them and the slides sent to me by him seemed nearer to populeus 

 than to bicolor. Pterocomma bicolor covers an extremely wide 

 distribution and shows great variation in the size and shape 

 of the nectaries. 



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