272 TERTIARY INSECTS OF NORTH AMERICA. 



1. Anconatus dorsuosus. 



PI. 18, Fig. 9. 



Anconatus dorsuosus Buokt., Monogr. Brit. Aphides, IV, 177-178, PI. 133, Fig. 4 (1883). 



Tlii.s large species is represented by several specimens, all tolerably 

 complete with more or less spread wings. In all the body is uniformly 

 dark, but in none is the form of the wing shown. The postcostal vein is 

 more or less slender, and merges into the greatly elongated subfusiforni 

 stigma, which fades out shortly before the tip of the wing. The first oblique 

 vein is straight and parts from the postcostal at an angle of about seventy 

 degrees, while the second is more or less arcuate after a short distance from 

 the base and its general course is at an angle of forty-five degrees with the 

 postcostal, though the first discoidal cell is apparently only a little more 

 than three times as broad on the hind margin as at the base. Cubital vein 

 arising scarcely before the middle of the space between the first oblique 

 and stigmatic veins and, running midway between the second oblique and 

 stigmatic veins, forking at some distance before the stigmatic vein (in which 

 the figure is not quite correct) and at about the end of one-third of its 

 course. Stigmatic cell very slender, the stigmatic vein being only gently 

 arcuate, and the cell nearly a third the length of the wing. 



Length of body, 6""° ; of fore wing, 8™". 



Florissant. Three specimens, Nos. 3228, 4827, 11175. 



2. Anconatus bucktoni. 



The body is deep black, with pale blotches on the abdomen of one 

 specimen, which may be only flaws in the carbonaceous matter. Excepting 

 the wings and fragments of legs, no appendages are preserved, unless it be 

 one of the cornicles, a slender, equal, not very long, black stem protruding 

 on one side at the place of the cornicle, and less than one-fourth the width 

 of the abdomen. The form of the wings can not be determined, but appar- 

 ently they are very narrow. The postcostal vein and stigma are as in A. 

 dorsuosus. The first oblique vein is straight, and diverges from the post- 

 costal at an angle of fifty degrees ; the second, equall}" straight, as far as it 

 can be seen (not over one-half its course), at an angle of forty degrees ; the 

 stigmatic cell not wholly determinate but perhaps wider at base than in A. 



