NO. 1290. LARY.E OF MOTHS FROM COLORADO— DYAR. 403 



normal, green, slightly dark shaded; anal pair dull black. Body 

 slightly translucent sordid olivaceous green, dorsal vessel narrowly 

 dark; the subventral fold looks lighter when well folded; no marks. 

 Tubercles rounded, rather small, slightly elevated, with black hair- 

 tubercles, but the plate concolorous with the skin; iv+v, ia+ib, 

 iia+iib, one above the other. Spiracles black with pale centers. Setae 

 rather long, dusk3^ ; 



Webbing up the leaves and stem of Argemone mexicami. th(^ pupa 

 in a folded leaf with the end bitten off. Often injurious to the plant, 

 as they eat the growing stem, distorting the plant. Also found on 

 a species of GUia, but perhaps as an accident. Found at Golden and 

 Boulder, near or on the prairie. i 



The United States National Museum has fragments of two speci- 

 mens, one labeled in Zeller's handw riting, the other taken by Belfrage 

 in Texas, July 2. Mr. Busck thinks that they ma}' have been part of 

 Zeller\s types; they certainly agree with his description. My speci- 

 mens run larger, though some are of the same size, and the banding 

 on the fore wings is heavier, not being so much confined to the costal 

 edge as in Zeller's specimens. But the sexes are marked alike, which 

 confirms me in the determination, as it is an unusual chararter in this 

 genus. 



Family YPONOMEUTID^E. 



ORCHEMIA DIANA Huebner.i 



Larm. — Head rounded, bilo})ed, sutures depressed, pale reddish, 

 whitish on the paraclypeal pieces and mouth, a black line on the pos- 

 terior side of lobes. Body slender, tapering a little at the ends; trans- 

 lucent greenish yellow, scarcely distinctly colored; a dull white dorsal 

 band of pigment, somewhat cut by the annulets, touching tubercle i, 

 well defined. Tubercles large, black, round, a little elevated; iv+v, 

 normal. A diffuse yellowish white stigmatal band. Seta? moderate, 

 pale. The food shows dark green or sordid, being especially visible 

 subdorsally. 



Cocoon large, a broad sheet of white silk, under which the true 

 cocoon is formed, tube like, enlarged in the middle. 



The larvse were very common on the birch in the Platte Canyon, 

 more especially higher up, at an altitude of 7,000 feet; also on the foot- 

 hills back of Golden at a similar altitude. The birches were often 

 completely defoliated b}' the larvffi, except for the leaves which served 

 to support the cocoons, though these were often distributed over 



' Professor Fernald identifies this species with the European 0. diana. I have seen 

 but two specimens of this rare species, and both differ from the American form, of 

 which I possess now a large series. Our moths are very dark, with no trace of the 

 greenish overlying scales of the European ones. They may, perhaps, be separated 

 under the varietal name hetuliperda. 



