AMERICAN APTERA. 319 



neath yellow, reticulated with ferruginous. The yjrolongation of its secondaries 

 is less, and the upper surface of the primaries has nine black spots. From 

 North America. 



Boisduval and Leconte in their C-aut-cum, describe the upper side 

 of the inferiors as brown, or of an obscure ferruginous glossed with bUi- 

 ish green, with the base of a bright ferruginous. The outline of their 

 figure approaches very nearly to that of umbrosa, but the representa- 

 tion of the inferiors differs widely from it, in that less than their inner 

 half along the internal margin is shaded lightly with ferown, while the 

 rest of the wing is fulvous and distinctly spotted with black as in in- 

 terro(/(itl())i!s. In their synonymy, they cite C-aurenm of Cramer, of 

 F.^bricius in Ent. Syst., and of Smith-Abbot; the interrogatlonis of 

 Godart (p. 301, n. 15,) and of Fabrieius in Supp. Ent. Syst. 



From the above it is evident that umbrosa is not the (J-aureum of 

 Fabrieius, Smith and Abbot, Boisduval and LeConte, or the interroga- 

 tlonis of Crodart, and is justly entitled to its indication as a new species. 



Xeif York State Cabinet of Natural History^ May 1869. 



Descriptions of two ACARIANS bred from the White Maple {Actr danycarpum). 

 BY HENRY SHIMER, M. D. 



VASATES, nov. gen. 



Abdomen long, tapering to a point, with two long anal setae. Legs /owr in 

 number. Inhabits galls. Movement not rapid. 



Vasates quadripedes, n. sp. — Body pale yellowish or yellowish-red, elongated 

 to a point behind and terminated by two long slender hairs. Legs directed 

 forward and quite at the anterior extremity, four in number, of the two poste- 

 rior pairs, usually found in acarians, there is positively not the slightest trace, 

 even in the most mature specimens,- a few hairs are scattered over the legs, 

 the foot appears to be 3-jointed, and is terminated by spines or hairs, tibiae short. 

 Length, 008— .005 inch. 



Gall on the upper side of the leaf, by a small pedicel ; form angular, wrinkled 

 and pitted; at first green, but at length becoming reddish ; the opening beneath 

 is very small and surrounded with a little woolly down ; size variable, say from 

 one-twenty eighth to one-eighth of an inch in diameter. 



For several years I have observed these galls in the early part of 

 the summer. la the early spring as the leaves begin to expand from 

 the bud, these galls, of very minute size, may be seen forming on the 

 leaf. They appear first on the lower limbs and leaves next to the body 

 of the tree, hence it appears probable that they pass the winter — per- 

 haps in the egg-state — on the ground around the tree, and in early 



