. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. LIFE HISTORY AND HABITS. 19 (lition of the soil, a loose damp soil being selected by the adults in preference to other kinds. Nearly all the eggs were placed in the first inch and a half of damp soil, and the greater part of these about 1 inch below the line of dampness. A small mite, which has been identified by Mr. Nathan Banks as (Gamasus) Parasitus coleoptratorum L. (?), was commonly noted in the soil with the eggs but was never seen destroying them. NUMBER AND HATCHING OF EGGS. Complete records for the eggs
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. LIFE HISTORY AND HABITS. 19 (lition of the soil, a loose damp soil being selected by the adults in preference to other kinds. Nearly all the eggs were placed in the first inch and a half of damp soil, and the greater part of these about 1 inch below the line of dampness. A small mite, which has been identified by Mr. Nathan Banks as (Gamasus) Parasitus coleoptratorum L. (?), was commonly noted in the soil with the eggs but was never seen destroying them. NUMBER AND HATCHING OF EGGS. Complete records for the eggs could not be obtained, so the lumi- ber of eggs laid by a female of this species is still a question. One female which had been isolated after fertilization laid 71 eggs before death, and 11 were added by dissection, brmgmg the total to 82 eggs. Another female gave a total of 63 eggs by ovij)osition and dis- section. Two others gave 61 and 52 eggs. Twenty-five dissections gave the number of eggs as between 28 and 40, or an average of about A?S4K. Fig. 4.—Diagram showing the period eggs ol the sugar-beet wireworm were in the soil, with temperature; season of lOri, Compton, Cal. (Original.) 34 eggs per individual. It is quite probable that 100 eggs or even more may be deposited by a single female. Practically all the eggs hatch. In the laboratory over 94 per cent of 5,000 eggs hatched successfully, even after they had been handled and kept under artificial conditions. Those which did not hatch were for the most part either allowed to dry out or were killed by a fungus. Eliminating tAvo cages—the one which dried out and th(> one in which the fungus appeared—it would be safe to say that over 98 per cent of about 4,200 eggs which were kept under labora- tory conditions hatched safely. There is an optimum zone, in so far as the degree of dampness is concerned, for the hatchmg of the eggs. Some eggs kept in a dry vial indoors, where it was not too warm, failed entu-ely to hat
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