6 LIFE HISTORY OF THE ALDER BLIGHT APHIS. 



GENERIC AND SPECIFIC SYNONYMY OF PROCIPHILUS TESSEL- 



LATA FITCH. 



Eriosoma tessellata Fitch, Cat. Ins. [N. Y.] State Cab. Nat. Hist., p. 68, 1851. 



Aphis stamineus Haldeman, Proc. Boston Soc. Nat. Hist., vol. 6, p. 403, 1859. 



Schizoncura tessellata Thomas, 8th Rept. Nox. and Ben. Ins. 111., p. 139, 

 1879. 



Pemphigus tessellata Osborn, Can. Ent., vol. 14, p. 61, 1882. 



Pemphigus acerifolii Riley, 8th Rept. Nox. and Ben. Ins. 111., Suppl., p. 209, 

 1879. 



Pem,phigus aliH Provancher, Petite Faune Entomologique du Canada, vol. 3, 

 p. 820, 1886. 



Prociphilus Koch. 



The genus ProcipMhis was described by C. L. Koch ^ in 1857, and 

 inchided three species. The following is a translation of his generic 

 diagnosis : 



'"'• Antennae. — Short; the two basal joints as usual, short; joint 3 

 as long as the two following joints combined and somewhat uneven; 

 joints 4 to 6 subequal in length; spur of 'sixth joint thin and rather 

 short. 



" Nectaries. — Wanting. 



''^Anterior wings. — Stigma long and narrow ; the stigmal vein 

 slightly curved. The fir.st two discoidal veins arising close together, 

 though not from the same point. 



^''Legs. — Rather stout and long." 



All of these characters agree well with those of P. tessellata Fitch 

 and some other species. 



In connection with the above description it seems necessary to add 

 a few points not mentioned by Koch : 



Antenna! joints 3 to 5 or 6 more or less densely provided with trans- 

 verse, elongate-oval sensoria, not reachirig the lateral margin. 



Venation of hind wings like that of Pemphigus; the two discoidal 

 veins arising near each other from the subcostal vein about the middle 

 between the base of the wing and the booklets, at a point where the 

 subcostal bends suddenly toward the front margin of the wing, giving 

 it the appearance of three discoidal veins or of a three-pronged fork. 



Last abdominal segment and tail semicircular and fringed with 

 slender hairs. 



Prociphilus tessellata Fitch. 



This so common species was first described by Dr. Asa Fitch, State 

 entomologist of the State of New York, from apterous specimens 

 found on branches of alder (Alnus rubra), in his catalogue of the 

 Homoptera of the State Cabinet of Natural History of the State of 

 New York, 1851, page 68, with the following words : 



1 " Pflanzenliiuse Aphiden," p. 279. 



