MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 213 



^foth. — Three f? , five 9 . Head ash, tawny ashen, with reddish brown discoloratioiis, thorax 

 ash color witli reddisli brown scales behind. Fore wings very i)alc tawny in the middle of the 

 wing, between the cinereous costa aiul the brown inner margin. No transverse lines. At the 

 base along the cubital vein is a dark streak ; there are three dark spots on the costoapical region ; 

 another faint linear minute streak in the apical interspace; in the two spaces below are two faint, 

 long, linear slight lines between the dark venules. A minute but distinct discal dot succeeded by a 

 linear streak reaching to the outer margin. Near the internal angle are two unequal linear spots. 

 A faint row of marginal brown lunules. Near the internal angle is a brown geminate discoloration. 

 Hind wings in 1 wliite with a dusky discoloration on the inner angle. Wings beneath pale; fore 

 wings a little dusky externally; the three costoapical dots and the spotted fringe visible beneath. 

 Fringe brown on the venules. 



Female: Baseof the fore wings fuscous; beyond ashy; a distinct subniedian dark basal streaky 

 a minute discal dot, with a faint biown streak beyond. Two twin costoapical streaks, more distinct 

 than in the S , so also two larger, broader spots near the internal angle. The marginal row of 

 spots more distinct. Hind wings dark, ashy, reddish brown. 



Expanse of wings, S 30 mm., 9 30-.31 mm.; length of body, i IG mm., 9 17 mm. 



It differs from badia in the wings being narrower and longer; the base of the fore wings is less 

 reddish, rounder, not lunate. The fringe is whiter on the edge; there is no reddish tinge on the 

 bind wings. It is a slender species. After a careful examination I am irnable to perceive any 

 difference between what I have decided to be nitlda and this species. This species, like the rest of 

 the genus, is remarkable for the difference in the color of the hind wings in the two sexes. 



A S in the United States National Museum, labele<l "240 L, from Cteur d'Alene City, 

 Idaho, August 20, IS'Jl," is, thougli rubbed, evidently paler on the fore wings, with less reddisli 

 brown than the Eastern individuals. There is no doubt about the species, as the basal 

 longitudinal reddisli stripe is present, and it does not differ materially otherwise. It is no larger, 

 the alar expanse being 30 mm. 



Var. mlici.s Edw. (one S . Type, California. I also have a S given me some years since by Mr. 

 Edwards). I can not, after repeated examination, really perceive any difference between this and 

 the Eastern concinna; it only differs in size, being a little larger and with slightly more pointed 

 fore wings, as one would expect to find it, in accordance with the facts pointed out in my 

 Monograph of Geometrid Moths (p. 587), where a list of twenty five species of Geometrids, which 

 grow larger on the Pacific than the Atlantic Coast, is given. The three last stages are described 

 by Mr. Dyar, and show that the larva is closely similar in each stage to the Eastern concinna. 

 Mr. JMlwards's descrijjtion of the mature larva agrees exactly with our Rhode Island examples. 



Uf/g. — Diameter about 6 mm. Low hemispherical, the height being about half the diameter. 

 The shell is thin, smooth, and under a triplet not seen to be pitted, but under a half-inch objective 

 the surface is seen to be divided into regular, moderately large, flat polygonal areas, with slightly 

 raised but distinct edges. No micropyle visible, and no specialized arrangement of the polygons 

 on the apex of the egg. 



Freshly hatched ^arco.— Length, 3 mm. Head large, globular, smooth, and unarmed, a third 

 wider than the body, deep dark, honey-yellow. The body is greenish yellow above, cherry- 

 reddish on the sides; the prothoracic dorsal tubercles ai'e larger and higher than those on the 

 second and third thoracic segments and connected by a chitiuous band, becoming more distinct in 

 Stages II and III. The first and eighth abdominal segments are reddish, including the pair of 

 dorsal tubercles, which are of the same size. The end of the body is held up, much as in the 

 fully grown larva, and I mistook it for a Schizura larva, like the ordinary species, luitil after it 

 had molted, as the tubercles are conical in this stage as in freshly hatched Schizura' of other 

 species. In some individuals the greenish dorsal tubercles are dark at the tip. The glandular 

 hairs are bulbous at the tips, and a few at each end are nearly one-half as long as the body. 



Three days after, June 27, they became 5 mm. in length, the head now small, and the larvre. 

 were preparing to molt, and July 29-30 three cast their skins. 



Stage II. — Length, 4-5 mm. at first. Now the body is like dark opaque varnisli in color. 

 The head is dark reddish varnish or pitchy in hue, and decidedly narrows above, bearing two 

 blunt knobs on the vertex; it is now wider than the body. The prothoracic shield is larger than 



