. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 23 it enters and devours the contents. After a time it casts its skin and assumes what is termed the "caraboid" or second larval stage (<f, «?); and with another molt it resembles a white grub, the " scarab^eoid" larval stage (/). When a larva has finished its quota of locusts' eggs it undergoes a fourth molt and forms within its own skin what is known as the coarctate larval stage (r/), and in this condition usually passes the winter. In the spring another larval molt takes plac^, and wit
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 23 it enters and devours the contents. After a time it casts its skin and assumes what is termed the "caraboid" or second larval stage (<f, «?); and with another molt it resembles a white grub, the " scarab^eoid" larval stage (/). When a larva has finished its quota of locusts' eggs it undergoes a fourth molt and forms within its own skin what is known as the coarctate larval stage (r/), and in this condition usually passes the winter. In the spring another larval molt takes plac^, and with the last shedding of its skin the insect enters upon the tru^: pupal stage, and in due time transforms to a ; The pupa of a related species is illustrated in iigure 16. This species also does injury to beans, peas, tomato, turnip, radish, melons, corn, clover, and alfalfa. It was the cause of a serious out- break in Michigan in the latter part of June and the first part of July, 1900. Corn plants about six inches high and clover suffered severely, the reason being that the potatoes grown there, ])eing all late varieties, had not come up, and more palatable food was not available. The writer has seen hordes of this species traveling in much the same manner as army worms, and feeding with such voracit}' that scarcely a beetle flew when plants on which they were congregated â were approached. When a "flock" starts to feed on one form of food plant it continues on this until all plants in sight have been devoured, when the beetles have recourse to other plants that are palatable to them. This trait has also been observed in other species, especially in the margined blister beetle. THE THREE-LINED BLISTER BEETLE. (Epicauta lemniscaia Fab.) This blister beetle very closely resembles the preceding; in fact, the two arc frequently con- founded, and injuries inflicted by one species are apt to be attributed to the other. The form under consideration (fig. 11)
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