Abstract
In 1963 a study was made of the larval instars and the pupae of the western rom rootworm, Diabetics virgifera Leone, Larvae fed on mature squash fruit and held in the dark at 20°C consistently had 3 in stars. Width of the head capsule was the most constant of the several structures measured and was therefore considered the most valid indicator of the larval instar. Measurements of larvae collected in the field compared favorably with measurements of the 3rd-instar larvae reared in the laboratory. Calculations by Dyar’s method indicated that all in stars had been observed. Female pupae were distinguished by a pair of obvious papillae on the 9th abdominal segment. The average time of development at 20°C was 11 day for the 1st instar, 14 days for the 2nd instar, 27 days for the 3rd instar, and 15 days for the pupa.
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