12 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



Aphis gossypii Glover. 



Antennae of the same lengths as those of the apterous forms; the third 

 segment, however, armed with usually six sensoria which are irregular in 

 size, very few being large as are those of the alate; median ocellus absent, 

 the lateral ones, however, present in the specimens obtainable for study; 

 thorax with the alate characters very little, if at all developed, muscles 

 much reduced and some embryos visible within the thorax; wings much 

 reduced, being about as long as the third segment of the antennae; cor- 

 nicles not as short as those of the alate form, nor yet as long as those of the 

 apterous, slightly curved outward, but this character not as evident as in 

 the apterous form; cauda and anal plate similar to those of the apterous 

 female. Color and general appearance similar to those of the apterous 

 form. 



Described from three examples present in a collection taken 

 August 9, 1912, on melon, Vienna, Va. 



Phyllaphis fagi Linn. 



Color nearly that of the alate. Antennae with the same measurements 

 as those of the aptera, and with the same characters, there being no sen- 

 soria on the third segment; ocelli absent; alate thoracic characters dis- 

 tinct, showing moderately developed lobes on the dorsum; wings very much 

 reduced, being small, oval, leaf like structures, with a thickening along the 

 costal margin; other characters usual. 



Described from one specimen in a collection taken on beech, 

 May 12, 1914, at Washington, D. C. 



This intermediate is interesting in having a fairly well developed 

 thorax in connection with the much reduced wings. It is more 

 interesting, however, in that this thorax, externally so well 

 developed' has lost the large alary muscles entirely. It is filled 

 with developing embryos and, therefore, does not agree at all 

 with the thorax of the alate form. 



Macrosiphum viticola Thos. 



Color similar to that of the apterous form; antennae with the same 

 measurements as those of the alate and with the third segment possessing 

 about six circular sensoria; vertex not extending forward to median ocellus, 

 but almost flat, this median ocellus being very faint in one specimen and 

 absent in the other; lateral ocelli present; alate thoracic characters hardly 

 present. Wings showing as pad-like structures not as large as the wing 

 pads of the pupa; wings of both specimens about equally developed, but 

 the great dorso-ventral muscles of the thorax somewhat more reduced in 

 one than in the other; cauda long and narrow, similar to that of the other 

 adult forms. 



