UEMIPTERA— UOMOPTEKA— APniDES. 257 



The eccentric Constantine Rafinesque-Sclimalz made the first attempt 

 to classify American Aphides. 



Florissant. One specimen, No. 1G67. 



3. SiPHONOPHOROIDES PKOPINQUA. 



The single specimen on wliicli this species is l:)ased is not so well pre- 

 served as the last. The antennii? are broken in the middle, but were appar- 

 ent!}' of a similar length. The wings are slender, fully three times longer 

 than liroad. The postcostal is very broad, straight, and uninterrupted. 

 The first oblique vein is straight, and parts from the postcostal at an angle 

 of about fifty degrees ; the second is straight at base, beyond considerably 

 arcuate, separated by a narrow distance from the first, and placed at an 

 angle of scarcely forty degrees with the postcostal, so that the first discoidal 

 cell between them is verv long and slender, and is about four times as broad 

 on the liind margin as at the base. The cubital vein arises nearly twice as 

 far from the second oblique as that from the first, forks at rather less than 

 one-third way to the hind margin, and is very arcuate in course, so that 

 though its first fork approaches exceptional!}' near the second oblique vein, 

 the main stem readies only twice tlie distance from the stigmatic vein. 

 Tliis last vein arises opposite a point on the culjita! vein one-tliird way 

 from tlie first to tlie second fork, and, strongly arcuate, passes at once far 

 into the wing, and then becomes longitudinal, the stigmatic cell being 

 pretty large and long, about two-fifths the length of the wing. Legs very 

 slender. 



Length of fore wing, 5.5"'"; breadth of same, 1.5"""; length of fore 

 femora, 1.75"" ; fore tibia? and tarsi, 2.5""' ; hind femora. 2.25"" ; hind 

 tibiae and tarsi, 4.2"". 



Florissant. One specimen. No. 3738. 



7. LITHAPHIS gen. nov. {h'do?, Aphis.) 



Head rather small with short frontal tubercles on which the antenna? 

 are seated in close proximit}-. The first two joints of the latter as in 

 Siphonophoroides, the remainder also as there, but if anything even longer. 

 Fore wing with the stigmatic vein arising from the middle of the stigma. 

 Cubital vein twice forked, the first time vevv far from its origin (which is 

 about a third way from the base of the first oblique to the stigmatic vein) 

 VOL xiii 17 



