286 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Forms living on the foliage of plants, usually more or less 

 solitary in habit, often strikingly colored. 



Key to Genera. 



Cornicles quite long and somewhat swollen in the middle ...... 



Drepanosiphum, p. 286 

 Cornicles not especially prominent and with the swelling at the base 



Drepanaphis, p. 286 



Drepanaphis Del Guercio. 



Cornicles large but rather narrow toward the distal extremity 

 and distinctly swollen at the base. Antennae of six segments 

 armed with subcircular or oval sensoria. Fore wing with the 

 media twice branched, hind wing with both media and cubitus 

 present. Cauda knobbed ; anal plate somewhat indented. 



Forms somewhat solitary on the leaves of trees ; males usually 

 winged. 



Key to Species. 



Abdomen with a bilobed tubercle on dorsum and with three other 

 pairs. Sensoria usually extending over entire segment .... acerf oliae 



Abdomen usually without pairs of tubercles other than the bilobed 

 one, never with three pairs. Sensoria usually located at base monelli 



D. acerifoliae (Thomas). Siphonophora acerlf oliae Thomas. 

 Phymatosyphum acerifoliae (Thomas) Davis. 



111. St. Lab. Nat. Hist, Bull. 2, 4, 1877. 



This is a well-marked species with bordered wing veins and 

 prominent tubercles on dorsum of abdomen. 



On cut leaf maple. 



New Haven, 3 Aug., 1909 (A. I. B.) ; on sugar maple, New Haven, 15 

 June, 1910, 8 June, 1911 (G. A. Cromie) ; 1 July, 1913 (B. H. W.) ; 

 Hamden, 6 June, 1913 (W. E. B.) ; Hartford, 3 June, 1915 (Hartford 

 Forestry Co.). 



D. monelli Davis. 



Ann. Ent. Soc. Am., ii, 197, 1909. 



Drepanosiphum Koch. 



Cornicles very long subcylindric or swollen in the middle. 

 i\ntennae of six segments armed with oval or subcircular sensoria. 

 Fore wing with the media twice branched ; hind wing with both 

 media and cubitus present. Cauda knobbed. Anal plate slightly 

 indented. 

 D. platanoides (Schrank). Aphis platanoides Schrank. (Fig. 



3i, 1.) 



Fauna Boica, ii, 112, 1801. 



The only species recorded from New England. 



On Sycamore maple. 



Stonington, 29 May, 1909 (W. E. B.). 



