. Circular. Insects. 11 bug,0 is illustrated at figure 6. Other natural enemies are robber flies,& spiders, and a tachina This last develops within the body of the potato beetle larva and has been observed so abundant in potato fields that its buzzing resembled the noise made by the swarm- ing of bees. Wasps of some species attack the larvae, and the rust- red social wasp d has been seen carrying them to provision its nest. Xot infrequently the beetle is found partly covered by dull, yellowish, rounded mites. These are external parasites e and help somewhat in reducing their hosts. A
. Circular. Insects. 11 bug,0 is illustrated at figure 6. Other natural enemies are robber flies,& spiders, and a tachina This last develops within the body of the potato beetle larva and has been observed so abundant in potato fields that its buzzing resembled the noise made by the swarm- ing of bees. Wasps of some species attack the larvae, and the rust- red social wasp d has been seen carrying them to provision its nest. Xot infrequently the beetle is found partly covered by dull, yellowish, rounded mites. These are external parasites e and help somewhat in reducing their hosts. A species of daddy-long-legs is also a natural enemy/ Other predatory insects include a tiger beetle (Tetracha virginica L.) and two rove-beetles (Philonthus apicalis Say and Quedius molo- chinus Grav.). Most of the species listed above have been recorded by Riley, but many have also been observed independently by others, and correspondents of this Bureau fre- quently call atten- tion to the com- moner forms. Thus far only in- sect foes of the po- tato beetle have been discussed, but certain mammals, birds, amphibians or batrachians, and reptiles are well- known enemies. One of the most im- portant of the birds FlG- 6>—spined soldier-bug (Podisus mactdiventris): Adult at left, , , ' nymph at right. Much enlarged (original). is the rose-breasted grosbeak, whose services as an enemy of this beetle have been little appreciated until comparatively recent times. The bobwhite or quailg a The soldier-bugs include Podisus maculiventris Say [spinosus], P. cynicus Say, the bordered soldier-bug (Stiretrus anchorago Fab., Perillus circumcinctus Stal., P. claudus Say, Milyas cinctus Fab., and Sinea diadema Fab. These com- monly attack the larval potato beetle. Nezara Mlaris Say and EuscJiistus va- riolar i us Beauv. are said to have the same habit, but can not be important enemies, as they are naturally herbivorous. & Proctacanthus milbertii Macq. c Phorocera (Lydella) doryphorw Ril
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
