268 TERTIARY INSECTS OF NORTH AMERICA. 



11. SYCHNOBROCHUS gen. nov. (ovxv6?, ^p6xo?). 



The fore wings with the stigmatic vein arising from the middle of the 

 stigma and very longitudinal. Cubital vein at least once forked, far from 

 base, and opposite the base of the stigmatic vein, arising nearly midway 

 between the first oblique and stigmatic veins ; beyond it is too poorly pre- 

 served in the only specimen known to be certain whether it forks again or 

 not. Second oblique vein arising four times as near the first oblique as the 

 cubital vein, at an angle of less than forty-five degrees with the postcostal 

 vein, the first oblique, which is nearly parallel to it. curving outward in the 

 latter part of its course, so that the first discoidal cell between them is exces- 

 sively long and arcuate. Abdomen long and narrow, narrower than the 

 thorax, twice as long as l)road, and well rounded apioally. 



Sychnobrochus reviviscens. 



« 



P!. 18, Fig. G. 



One of the very smallest of the Aphides, unfortunately showing of the 

 appendages only one wing. The head and prothorax are light colored, but 

 darker than the abdomen, which shows darker transverse bands on the pos- 

 terior halves of the segments. The wings are only slightly longer than the 

 bodyf the abdomen being longer than usual), perhaps slightly more than 

 three times as long as broad, the slender postcostal vein parallel throughout 

 with the co.sta, the interspace more or less clouded with pigment, the stigma 

 moderately broad and very long, reaching nearly or quite to the extreme 

 tij) of the wing. The oblique veins are both remarkably long and of nearly 

 (Hjual length, curving outward apically, and extending so far that even the 

 first terminates Avell in the outer half of the wing ; they arise close together, 

 the first at an angle of scarcely more, the second of scarcely less, than forty- 

 five degrees with the postcostal, and are nearly i)arallel, the discoidal cell 

 being therefore arcuate and about two or three times as broad on the hind 

 margin as at the base. The cubital vein is faint and obscure, apparently 

 arising at a little less than half-way from the first oblique to the stigmatic 

 vein, and four or five times farther from the second oblique than it from 

 the first oblique vein ; its first forking can not be satisfactorily determined, 

 ))ut it appears to be far from the base and a ver}^ little in advance of the 

 stigmatic vein ; it has the same sweep as the oblique veins. The stigmatic 



