| Abstrakt: |
Abstract: Voltinism in Microvelia pulchella Westwood, 1834 was studied in southern Illinois during 1989 and 1990. This species overwintered as eggs, which hatched during April. First instars were found from mid-April through mid-October, second instars from mid-April through mid-October, third instars from late April through late October, fourth instars from late April through mid-November, and adults from early May through early November. The sequences of peaks of nymphal instars and adults indicated that this species had 4-5 generations per year. M. pulchella was reared from egg to adult at 23.3+1.1°C under a 14L:10D photoperiod. The incubation period averaged 9.85 days; and the first through fourth stadia averaged 8.18, 6.14, 6.32, and 7.72 days, respectively. Total developmental time averaged 34.07 days. |
