258 TERTIARY INSECTS OF NORTH AMERICA. 



about opposite the base of the stigmatic vein, the second time apparent!}' 

 about half-way to the tip of the wing. Second oblique vein arising slightly 

 nearer the first oblique than the cubital vein, at rather more than half a right 

 angle with the postcostal : first oblique vein parting much more widely, about 

 eighty degrees, so that the first discoidal cell between them, very narrow at 

 base, is six or more times wider there than on the hind margin. Le^s 



o o 



moderately slender, the hind femora shorter than the abdomen, which is no 

 broader than the thorax, twice as long as broad, and rounded. 

 A single species is known. 



LlTHAPHIS DIRUTA. 



The body appears to have been pretty uniformly colored. The pro- 

 portions of the wings can not be determined, but the insect was one of the 

 smaller species. The postcostal is parallel with the costa, moderately slen- 

 der, especially just before the long and tapering stigma. The first oblique 

 vein is very transverse, parting at an angle of about eighty degrees with 

 the postcostal, and straight ; the second oblique vein, arising rather close to 

 the first, is slightly arcuate and parts from the postcostal at an angle of forty- 

 five degrees, so that the first discoidal cell is man}- times broader on the hind 

 margin than at the base. The cubital vein arises less than twice as far be- 

 yond the second oblique vein as that beyond the first, is rather straight and 

 stiff, first forks at less than a third way to the hind margin and again about 

 half-way to the tip, approaching the stigmatic rather than the second oblique 

 vein. The stigmatic vein arises scarcely beyond the first furcation of the 

 cubital, and, strongly arcuate at first, reaches widely into the wing, the stig- 

 matic cell being large and long. 



Length of body, 8 mm ; antenna*, ;j.5 mm ; wing (probable), 4.;")""". 



Florissant, Three specimens, Nos. 3785, 12112, 12476. A specimen 

 from Green River, No. 82, Prof. L. A. Lee, may perhaps belong here. 



S. TEPHRAPHIS gen. nov. (retppnv, Aphis). 



Siphonophoroides (pars) Hnckton, Monogr. lint. Aphides, IV, 17(i (ISSH). 



Head apparently much as in Lithaphis, luit the front tubercles are 

 uncertain. Antenna- constructed basally as there, separated at base b\ 

 their own width, much longer than the fore wing. Fore wing with the 

 stigmatic vein arising rather before the middle of the unusually broad 



