HEMIPTERA—HOMOPTERA— APHIDES. 259 



stigma. Cubital vein twice forked, the first time very near to its origin 

 (which is about two-thirds the distance from the first obUque to the stig- 

 matic vein), and about opposite the base of the stigmatic vein, the second 

 time at varying distances from the first. Second oblique vein a little nearer 

 the fir.st oblique than the stigmatic vein, unusually transverse, the first 

 scarcely more longitudinal, so that the first discoidal cell between them, 

 broad at base, is not more than twice as broad on the hind margin. Legs 

 slender, the hind femora nearly as long as the abdomen, the rest of the leg 

 about two-thirds the length of the fore wings. Abdomen short oval, well 

 ronnded apically, no broader than the thorax. Both species are very small. 



Table of the species of J'ephraplds. 



First discoidal cell only half as broad again oa the hind margin as at base, the first and second oblique 

 veins very nearly parallel 1. T. simplex. 



First discoidal cell twice as broad on the hind margin as at base, the first and second oblique veins 

 distinctly divergent .. 2. T. ivahhii. 



1. Tephraphis simplex. 

 PI. 18, Fig. 4. 



Siphonopkoroides simplex Bncktoo, Monogr. Brif. Aphides, IV, 176-177, PI. 133, Fig. 2 (1883). 



This is one of the smallest of the Florissant species. The antennte, 

 twice as long as the body, taper to a slender thread, scarcely visible on the 

 stone. The body has the abdomen very pale and indistinct, but the rest 

 much darker, and the legs are uniformly dark. The wings are slender, at 

 least three times as long as broad. The postcostal vein is very heavy and 

 straight and the stigma, hardly broader, is very long. The first oblique 

 vein is straight and parts from the postcostal at an angle of about fifty-five 

 degrees ; the second oblique is very distant from the first, parts from the 

 postcostal at an angle of about fifty degrees, and, at first straight and there- 

 fore almost parallel to the first oblique vein, is afterwards a little arcuate, 

 so that the first discoidal cell is about half as broad again on the hind 

 margin as at its base. The cubital vein, a little farther removed from the 

 second oblique vein than the latter is from the first, runs with its first fork 

 in a straight course, parallel to the second obliqu-e vein, forks at one-fourth 

 the distance from the base, and is considerably angulated, running after- 

 wards completely parallel to the stigmatic vein, and forking again about 

 half-way to the tip of the wing. Stigmatic vein arising closely subsequent 

 to the first forking of the cubital vein, parting abruptly and curving 



