larger and more distinct than above. Hind wings with the single line diffuse. 

 Lesrs srreen. washed with white; hind femora yellowish below. 



Length of body, <?,0.42, 9,0.40; of fore wing, <J, 0.52-0.60, 9,0.58; 

 expanse of wings, 1.10-1.20 inches. 



Montreal, Canada (Lyman); Boston, Mass., Andover, Mass., July (San- 

 born): Philadelphia, Pa. (Amer. I'lnt. Sop.); New Jersey (Sachs); Demopolis, 



Ala. (Grate), 



This interesting species varies but slightly, and may always be separated 

 from all the other green Geometrids by the great inequality in the size of the 

 wings. . . 



EUCROSTIS Hiibner. Plate 4, fig. 7; plate 6, fig. 22. 



Encrostis Hiibn., Verz., 283, 1818. 



Geometra Treits., (in part,) Scbm. Eur., v, 430, 1825. 



Fidonia Dap. (in part), Lep. France, viii (iv), 407, 1829. 



Boisd., Gen. Ind., 170, 1840. 

 Vhlorochroma lhip., Cat., 224, 1844. 

 Fidonia Il.-Scb., Solim. Eur., iii, 7, 1847. 

 Encrostis Lederer, Verb. Hot. Zool. Get,. Wieu, 189, 1853. 



and Xcmoria Guen. (in part), Pbal., i, 306, 345, 1857. 



Walk, (in part), List Lep. Het, Br. Mus., xxii, 505, 1861. 



Front rather narrower anteriorly than in Nemoria. Palpi rather large, 

 projecting well in advance of the front, the second joint rather large and 

 bushy. Male antennas with rather long pectinations, terminal fourth simple; 

 in the female simple, finely serrated. Fore wings with the costa straight, the 

 apex rather obtuse. Hind wings much rounded. Fringe on both wings 

 unusually long. Venation: the costal region is rather wide, the subcostal 

 cell is sometimes open (chloroleucaria) ; the posterior discal venule is very 

 oblique, but not much curved; the origin of the first median venule is a little 

 removed from that of the second, while in Nemoria the origins of the two are 

 blended. Hind legs: tibiae long, with a large brush of hairs; tarsi one-third 

 to one-half as long as the tibiae (chloroleucaria), or a little longer than the 

 tibia? (in the European herbaria). Abdomen moderately long. Coloration: 

 green, with white firm lines, the outer common to both wings, broad and 

 conspicuous; fringe whitish, rarely deep red. 



This genus, some species of which, as our common chloroleucaria and 

 the European herbaria, have been referred to Nemoria by Guenee, is readily 

 distinguished from the other Geometrina. by the large bushy palpi, well- 

 pectinated antennas, the triangular fore wings with their straight costa and 

 47 P H 



