HEMIPTERA—HOMOPTERA— APHIDES. 255 



ing somewhat but not greatly neai-er the first oblique than the cubital vein, 

 the first at a considerably wider angle, so that the first discoidal cell between 

 them is from three or four to six or eight times as broad on the hind margin 

 as at the base. Leu^s slender, the hind femora half as lonsr as the fore wing-s. 

 Abdomen ovate, rather broad, well rounded apically, with very short and 

 stout cornicles in at least one species, but no caudci. 



Buckton gave no characteristics of his genus apart from the specific 

 description ; his supposition that the abdomen was pointed was due to his 

 taking the faint signs of the first oblique veins as the sides of the abdomen 

 in the figure which formed the basis of his determination. 



Table of the species of Sipltonophoroides. 



Second oblique vein partiug from tlie postcostal at an angle of forty-five degrees 1. S. antiqua. 



Second oblique vein parting from the postcostal at an angle of thirty-five degrees. 



First branch of cubital vein distant from the second oblique veiu 2. S. rafinesqaei. 



First branch of cubital vein closely approximated to the second oblique vein 3. S. propinqua. 



SiPHONOPHOROIDES ANTIQUA. 



PI. 18, Figs. 3, 5, 7, 10. 



Siphonophoroidea antiqua Buckton, Monogr. Brit. Aphides, IV, 176, PI. l:!3. Fig. 1 (1883). 



TIlis is far the most common of the Florissant Aphides, and many of 

 the specimens are very fairly preserved. They are uniformly dark colored, 

 or the abdomen may be a little paler or more obscure than the rest of the 

 body. The wings are pretty slender, fully three times as long as broad. 

 The postcostal vein is moderately thick, uniform, and running without 

 break into the very long fusiform stigma ; it is separated by a moderately 

 wide and regularly decreasing space from the costal margin. The first 

 oblique vein is straight and parts from the postcostal at an angle of full}^ 

 sixty degrees ; the second oblique is straight in its basal half, arcuate or 

 sinuate beyond, parting from the postcostal at an angle of about forty-five 

 degrees at a moderate distance from the first oblique vein, the first discoidal 

 cell between them being about four times as broad on the hind margin as 

 at the base. Cubital vein arising farther, generally about half as far again, 

 sometimes almost twice as far, from the second oblique as that from the 

 first oblique vein, very longitudinal in course, first forking at about two- 

 fifths the distance to the hind margin and again at about half-way between 

 the first forking and the tip of the wing, running about twice as near the 

 stigmatic as the second oblique vein. Stigmatic vein arising nearer the first 



