Report on the Rocky Mountain locust and other insects now injuring or likely to injure field and garden crops in the western states and territories . salis. The Comma Bvttbrfly, PoJygonia {Grapta) comma {Harris).—This is a smaller butterfly than the pre-ceding, appearing in May and lay-ing its eggs on the leaves of thehop-vine, as well as other plants(the elm, nettle and Baehmeria cylin-drica). The caterpillars change tochrysalides in the middle of July,their butterflies lay eggs for a newbrood of caterpillars, which changeto chrysalides the first of Septem-ber and the butterflies hibernate. F
Report on the Rocky Mountain locust and other insects now injuring or likely to injure field and garden crops in the western states and territories . salis. The Comma Bvttbrfly, PoJygonia {Grapta) comma {Harris).—This is a smaller butterfly than the pre-ceding, appearing in May and lay-ing its eggs on the leaves of thehop-vine, as well as other plants(the elm, nettle and Baehmeria cylin-drica). The caterpillars change tochrysalides in the middle of July,their butterflies lay eggs for a newbrood of caterpillars, which changeto chrysalides the first of Septem-ber and the butterflies hibernate. Fig. 44.—Progne —The cater])iliar closely resembles that of G. interrogationis. The buttcifly is much smaller than P. interrogationis, and the fore wings of much the same shape,but Ibo hind wings arc more toothed, with a broad, less sharp tail. The spots andcolor are much the same but darker. Hind wings with an angular, slender, silverymark, somewhat like a comma. The inner half of both wings darker wood-ash colorthan in P. interrogationis. Expanse of wiugs, 2J inches. It is very closely allied to (Fig. 44).. PACKARD.] THE COTTON ARMY-WORM. 775 The Hop Vine Root-Borer, Eepiahis mustelinus Packard.—Thismoth is closely allied to the Eepiahis humiili of Europe, which bores inthe roots of the hop. Xo borer has yet been detected in our vines, butit is uot improbable that the above-named species will be found to attackthis plant. It flies in Maine from the middle of July to the middle ofAugust. Description of the moth.—Female witli the body and wings sable-brown. Fore wingswith three broad silvery spots on the costa, margined with black ; a broad silvery linealong the internal margin, which is continued as a submarginal oblique straight line,dislocated near the middle of the wing, and margined with yellowish-brown with someblack scales. A marginal series of triangular spots. Fringe dark at the base, spottedexternally with silver. Beneath, the b
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectb, booksubjectinsects
