The green June beetle [Cotinis nitida L.] . Fig. 1.—Adult of green June beetle{Cotinis nitida) of a type show-ing narrow margin about elytraand narrow margin on anteriorhalf of thorax. One-third enlarged. HABITS DIFFERENT FROM THOSE OF WHITE GRUBS. The green June beetle differs from the May beetles in habits, be-ing strictly diurnal and most active in the heat of the day, whereas 4 BULLETIN 891, U. S. DEPARTMENT OF AGEICULTURE. the typical winged Phyllophaga is nocturnal. There is a still morestriking difference in that the larva of the green June beetle travelson its back, whereas that of Phy
The green June beetle [Cotinis nitida L.] . Fig. 1.—Adult of green June beetle{Cotinis nitida) of a type show-ing narrow margin about elytraand narrow margin on anteriorhalf of thorax. One-third enlarged. HABITS DIFFERENT FROM THOSE OF WHITE GRUBS. The green June beetle differs from the May beetles in habits, be-ing strictly diurnal and most active in the heat of the day, whereas 4 BULLETIN 891, U. S. DEPARTMENT OF AGEICULTURE. the typical winged Phyllophaga is nocturnal. There is a still morestriking difference in that the larva of the green June beetle travelson its back, whereas that of Phyllophaga either progresses on itsside or, where possible, on the abdomen with the aid of the legs. The larva (fig. 2), particularly when mature, differs from the com-mon white grub of the genus Phyllophaga in being larger, and pro-. Fir,. 2.—Full-grown larva of green .Tune beetle in natural position crawling on back. Twice natural size. portionately so, as regards the size of the adults. It is also morerobust and more nearly cylindrical; its legs are considerably shorterand its mandibles and other mouth parts smaller. It differs also inthe possession of stiff ambulatory bristles, which more or less closelycover the dorsum and enable the insect to crawl, not on its side, as isthe case with the Phyllophaga larva, but upon its back. This is ac-complished by alternate contractionand expansion of the segments of thebody, the stiff dorsal hairs materiallyassisting progress. The speed is prob-ably more rapid than that of any otherknown genus of the Scarabaeidae oc-curring in the United States. Indeed,it progresses on its back at about thesame rate as the hairy caterpillars doon their legs and prolegs, and in a simi-lar manner.
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherwashi, bookyear1922
