COSYMBIA. By L. B. Prout 
95 
Mr. Benjamin that the one in the United States National Museum which is considered the type is in very 
poor condition, rubbed and faded, with the lines, excepting the median shade, almost lost, but that it was 
probably originally like our figured $ from Sonomo County. The range extends to the southern part of Van¬ 
couver Island. — piazzaria Wright seems to be merely a form of dataria, agreeing in the genitalia. The de- piazzaria. 
scription gives it the general aspect of “ myrtaria ” (i. e., packardi Prout) but with more nearly the maculation 
of pendulinaria (11 i) and unfortunately ignores dataria. Emphasis is laid on the heavy black encirclement 
of the ocelli (cell-spots), and this is very manifest in the few good specimens which I have seen; perhaps also 
the less clouded wings and weaker or less complete antemedian line are reliable characters. Mr. Benjamin 
has shown me, as “agreeing [I suppose in the $ genitalia, which he examined] with a paratype of piazzaria 
from Echo Mt., Calif. , a small 2nd-brood dataria d> from Wellington, B. C., which bears much the same rela¬ 
tionship to the figured specimen as does 2nd-brood suppunctaria Z. to lst-brood (see Supp. Vol. 4, p. 32): 
smoother-looking and*much more weakly marked, closely like a small specimen of the following form and very 
unlike piazzaria in its cell-rings. The type locality of piazzaria is San Diego, to which may be added Pasadena 
and Mt. Lowe; Arizona is also mentioned. — microps form. nov. (12 d) is apparently, by the genitalia, a third mi crop *. 
form of dataria, perhaps a good geographical race in Colorado, but with similar examples cropping up spor¬ 
adically among 2nd-brood dataria and even closely approached by an occasional packardi. Length of a fore¬ 
wing 11,5—13 mm; tone yellowish, irroration not intense, median shade moderate to rather weak, cell-marks 
small, often minute, their circumscription slender, often extremely slender. Colorado: Glenwood Springs, 
Durango, Denver, etc. (Oslar), May and again in August and September, without manifest seasonal variation 
but unfortunately mostly in poor condition; type in the Tring Museum, paratypes in that collection, in the 
Lhiited States National Museum and (presented by the latter) in my own and that of the British Museum. 
Compared with similar packardi — with which I first wanted to unite it — microps shows more inclination 
towards yellow, packardi, towards red; or in the more exact system of Ridgway's Table (p. 21 of his well- 
known work) one may say that the former favour the “No. 17” side of No. 15 (0—Y), the latter the “No. 13“ 
side (OY—0). Both, however, are troublesomely variable in hue. 
C. packardi sp. n. (— myrtaria Pack, nec Guen.) (12 d). As it is now definitely known (see below) that packardi. 
the species which has passed under this name among students of the Nearctic Geometridae (beginning with 
a careful description and fairly good figure by Packard) is not that of Guenee, it becomes necessary to treat 
it as a new species or possibly an eastern race of the preceding, with which it very nearly agrees in structure. 
Mr. Benjamin, on comparing the genitalia, found, as he informs me, some small differences in the length of 
the aedoeagus and the nature of the curvature of the claspers; packardi also shows a small kink in the sacculus- 
arm near its distal end which is not observable in its western relatives, so far as I have yet examined them. 
We both agree, however, that a study of more preparations is needful in order to ascertain the measure of 
constancy, and to understand the significance of these differences. Palpus in both sexes shorter than in myr¬ 
taria; antenna of the $ with the pectinations less long; hindleg of the $ not tufted, the tibia of about the same 
length as the tarsus. Generally smaller than dataria (at least in the 1st generation), less irrorated, median 
shade weaker, often obsolescent, postmedian of forewing anteriorly a little more irregular (incurved between 
the radials, bent outward at 1st radial, anteriorly inclined to recede slightly from termen), antemedian rarely 
so complete, cell-spots often more heavily clark-ringed (more recalling piazzaria ), underside more weakly 
marked. Widely distributed in the Eastern States and the Middle West of North America, though rarely, if 
ever, very common. Boston to North Carolina, Alabama, Illinois and Illissouri provide known localities; type 
a from 2 miles west of St. Louis, Mo. (Busck) in the United States National Museum (genit. No. 667, 
F. H. B.). The larva, according to Goodell (Amhurst, Mass.), is reddish brown striated with ochreous; a large 
subdorsal dark brown shade on each of the 6 middle segments, a darker dorsal stripe. When young, much 
attenuated and of a brighter colour. Feeds on Comptonia and Gaylussacia. Pupa very pale flesh colour, ab¬ 
domen more or less thickly spotted with black, wing cases pale, with black streak along upper margin. 
C. funginaria Guen. (12 d). Founded on a single $, the locality unknown, therefore at present somewhat jung inaria. 
of a stumbling-block. I have not yet quite matched it, but it is so similar to packardi in structure and mark¬ 
ings that I shall not be surprised if it is found that both are races, or even aberrations, of one species. It 
would, however, be premature to apply Guenee’s doubtful name to the well-known North American species. 
The termen of the forewing is very slightly more sinuous, making the apex appear a trifle more falcate as 
Guenee notices; colour a little darker, with more suggestion of purplish; cell-marks narrow. I thought the 
areole was a little smaller than in packardi, but find that it varies in the latter. 
E. myrtaria Guen. (12 d). A mixture of at least 3 species has certainly occurred under this name and myrtaria. 
possibly otheis still remain to be disentangled from it. Jones mentions a darker form of (probably) one of 
them from Bermuda, but I have no direct knowledge of it. Guenee’s type <$, otherwise in good condition, 
lias lost its abdomen and hindlegs, so that we are robbed of two of the most valuable criteria for its identi¬ 
fication. Mr. Benjamin has, however, examined very carefully the type in the United States National Museum 
and has very litlle doubt that he has correctly determined, as a “perfect match" to it, a q from Glenwood, 
