. Some insects injurious to garden and orchard crops : a series of articles dealing with insects of this class. S. Nat. Mus., vol. xi, pp. Eighteenth Rep. State Eutom. 111. for 1891 and 1892 (1894), pp. 109-145. THE ARCUATE MAY BEETLE. 75 THE ARCUATE MAY BEETLE. {Laehnosterna arcuata Sm.) Since the publication of Dr. Forbess reports on these insects thelarvae of our common L. arcuata have frequently been sent to thisoffice, and we have been able to identify the species, at least approxi-mately, which, of course, was impossible before that time. To obtain fresh specimens of the early
. Some insects injurious to garden and orchard crops : a series of articles dealing with insects of this class. S. Nat. Mus., vol. xi, pp. Eighteenth Rep. State Eutom. 111. for 1891 and 1892 (1894), pp. 109-145. THE ARCUATE MAY BEETLE. 75 THE ARCUATE MAY BEETLE. {Laehnosterna arcuata Sm.) Since the publication of Dr. Forbess reports on these insects thelarvae of our common L. arcuata have frequently been sent to thisoffice, and we have been able to identify the species, at least approxi-mately, which, of course, was impossible before that time. To obtain fresh specimens of the early stagesof this species for illustration and study, a n um-ber of beetles were captured at the electriclights of Washington City, placed in a jar ofearth May 25,1898, and kept supplied with oakleaves for food. Eggs were not deposited atonce, and in fact not until about the beginningof the second week in June, the exact date nothaving been ascertained. The parent beetlesdied the following week. The first larvse hatchedon the night of June 23, and eggs were stillhatching on the mornings of the 24th and Fig. 17.—Laehnosterna arcuata:a, male clasper, from front orabove; b, right clasper, fromside; c. left clasper; d, ventralcharacters of male; e, genitalstructure of female—all en-larged (adapted from Smith inInsect Life, vol. i.) DESCRIPTIVE. The following brief descriptions will assistwith the illustrations iu the recognition of thespecies in its different stages. It should be remarked, however, that,with the possible exception of that portion of figure 16 lettered/, thisillustration will apply almost equally well to all or nearly all of theseven species of Laehnosterna, formerly grouped in collections as/wsc«, and now included in what is termed, for con-venience, the fusca group. The specific differ-ences between arcuata and fusca are broughtout in the illustrations of their sexual charac-ters (figs. 17 and 18). The egg.—The eggs of Laehnosterna are ovalwhen first dep
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