274 
MEMOIES OF THE XATIO^TAL ACADEMY OF SCIENCES. 
markings are obsolete, including tbe marginal dots on both imirs of wings; as this is from southern- 
Utah, it is much bleached and rather larger than usual; it is another case of the law in the-- 
geographical distribution of the moths, that the si)ecies become both bleached and larger in 
the arid region of the Southwest, 
E(}(f , — Slightly more than hemispherical, the base hat, color dead black; diameter, 1.2 mm.. 
Of the Californian form, color dull, brownish black, smooth. Diameter, about 1 mm. Duration 
of this stage, eight days.” 
Larva. — Messrs. II. Edwards and S. L. Elliot (Papilio, iii, 130) have well described the larva 
of this siiecies, which lives on the willow. I have been able to compare some very well-preserved 
alcoholic specimens of the mature and young caterpillars (kindly loaned by Professor Eiley) with 
similar stages of the two foregoing species. 
Larva^ 8tage I. — Yar. ehiereoides. ‘^Uead dark red-brown. On joint 2 are two brown proc- 
esses, minutely spined. Joint 13 has two “ tails ” 3 mm. long, brown, twice broadly annulated with 
pale yellow and minutel}^ spined. The body is brown, with three dorsal pale yellow patches; on 
joints 2 to 0, S to 10, and 12, respectiv^ely, the posterior one faint. Tenter and legs pale whitish. 
Length of larva, exclusive of the tails, 4 mm. It spins a slight web on the surface of the leaf to- 
which it clings (p. 82). 
Stage II. — “Length, Avithout the tiiamental legs, 12 mm.; of the latter, 7 mm. It is at once- 
distinguished from the larvie of C. ocvidentalis and G. horeaUs of the same size by the larger 
bristles, the warts bearing them being scarcely larger, but the bristles themselves being two or 
three times as large. The head is as usual in the genus, as are the two lateral prothoracic 
“ horns” and the cervical shield from which they arise. The “horns” are as in G. occidentalism 
being spined in the same manner, and pale yellowish beneath. A laT'ge reddish triangular dorsal 
patch extends backward from the horns, the apex resting on the second thoracic segment. The 
back is discolored from the third thoracic segment to the end of the supraanal plate, not so 
decidedly reddish as in my specimens of the two other species previously described. 
Stage III. — “Head subquadrate, rounded, Hat in front, dead brownish black, the lower part 
paler and mottled centrally in front Avith a paler color. Anteiiuic Avhite, labnun and ocelli brown; 
width of head, 1.3 mm. Cervical horns thick, heavily spinose, brownish black; seA^eral rows of 
minute piliferous tubercles on the body; tails spinose, dark red-brown, twice broadly annulated 
with yellowish and tipped with the same color. Body green, a purple-brown subdorsal line 
passing down the sides to spiracles on joints 7 and 8, the .subdorsal spaces filled in with juirple- 
broAvn on joints 2, 3, 6-9, 11 and 13, though not completely on joints 8 and 9, but with a trace 
of a dorsal line on the other joints. Yciiter whitish.” (Dyar.) 
Stage lY, — “Head higher than Avide, rounded, a little fiattened in front; a minute tubercle- 
before the apex of each lobe; purplish black, finely mottled with yellow, green at the sides poste- 
riorly; antennm white, ocelli black; Avidth 2.2 mm, CerAucal horns thick, coA’ered by piliferous 
tubercles with about six rows of similar tubercles on each side of the body, only the upper two 
distinct. Color yellowish green. A triangular dorsal patch on joints 2 and 3, coA'cring the ceiw ical 
horns, purplish black, mottled Avith little yellow si)ots; a larger patch on joints 4-0, elliptical,, 
retracted at the segmental incisures, reaching the spiracle on joint 8, reidaced centrally irreg- 
ularly by yelloAV and broadly connected Avith a small patch on joints 10 and 11, widening on joint 
11 and joining a small i)atch on joint 13, replaced by greenish on the anal plate. Tails purplish 
broAvn, twice annulated Avith yellow.” (Dyar.) 
Mature larva . — Length, without the “tails,” 38 mm.; of the filamental legs, 15 mm. The head 
is small, being one-half as Avide as the body, reddish, but darker on the sides. 
The prothoracic horns in this stage are reduced to smooth projecting tubercles of the usual 
size, which are blackish above and pale below. Body iiale green. From the horns a lilac-red, 
nearly equilaterally triangular spot edged Avith yellow, extends backward, its apex resting on the 
hinder edge of the second thoracic segment. An oval lilac-red spot edged with yelloAV on the hind 
edge of the third thoracic segment separated by the suture from a similar spot on the first 
abdominal segment, but which is three or four times as large. A transversely subelliptical similar 
spot on the second abdominal segment twice as large as the one in front, succeeded by a much 
wider one on abdominal segments 3 and 4; that on the fifth segment is of the same size as that on 
