Insects affecting the orange . does uot yield to pressure from without, and is so accurately fitted thatno tell-tale crack can be discerned. Upon theback of the cocoon is an elevation formed by themeeting of several folds and ridges, forming amarvelously exact imitation of a winter ends of a lock of hair from the body of thecaterpillar counterfeit the down which in nature protects the dormantbud. The substance of which the cocoon is made is a tough parchment,composed of agglutinated silk, in which is felted the long, hairy cover-ing of the larva. Its color is a neutral brown, closely a
Insects affecting the orange . does uot yield to pressure from without, and is so accurately fitted thatno tell-tale crack can be discerned. Upon theback of the cocoon is an elevation formed by themeeting of several folds and ridges, forming amarvelously exact imitation of a winter ends of a lock of hair from the body of thecaterpillar counterfeit the down which in nature protects the dormantbud. The substance of which the cocoon is made is a tough parchment,composed of agglutinated silk, in which is felted the long, hairy cover-ing of the larva. Its color is a neutral brown, closely approximating tothat of the bark upon which it is placed. The entire arrangement is amost successful representation of the stump of a small branch brokenoff near its junction with the main stem,and upon which is plainly shown theswelling of a bud. The ])erfect insect (Fig. 59) is a mothwith a very wooly body, pale yellow,tinged with brown. The fore wingsare umber-brown at the base, fading topale yellow outwardly; the surface is. Fig. o9.—Lagoa opercularis, ) (Orig marked with fine wavy lines of silvergray, and the fore margins are nearly black. The legs are yellow, withdusky feet. The wiugs of the male moth spread about one inch ; thoseof the female an inch and a half. Life-history.—The larva is a very general feeder, and although theOak appears to be its principal food plant, it is occasionally injurious tothe Orange. It never injures the bark or tender shoots, but subsists onlyupon the mature leaves. There are two broods, one in early summer and the other in the larvte of the second brood form their cocoons in November or De-cember, and in them pass the winter, not changing to pupa untilthefollowing March or April, or weeks before the moths ap])ear. Parasites.—The same parasites have been bred from Lagoa as fromtlie Orange Dog. Tachina flies issued in June from a cocoon found onOrange in ]\Iarch. The hymenopterous parasite Chalcis rohusta is
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherwashi, bookyear1885
