ABSTRACT
Males and females of the species Migdolus fryanus were collected in sugarcane fields after mating and taken to the laboratory for morphological and biological investigations. Females were individualized in plastic containers in the soil (20 L). The newly hatched larvae and the eggs dimensions were measured with an ocular micrometer with 0.05 mm precision. Males were maintained in glass cylinders (12 cm height by 12 cm Ø), closed with Petri dishes (15 cm Ø), in order to get the longevity data. An artificial and modified diet was studied, supplemented with 50 g of triturated sugarcane. For the morphological observations, the insects were collected from sugarcane fields, pastures and abandoned coffee crop, and the material was examined by means of on optical microscope. The adults and larvae were measured using a calipers with 1-mm precision. The females laid from 19 to 38 eggs, with an average of 29.4 ± 5.5. The egg viability ranged from 65 to 98% with the average of 84.9 ± 11.6 % and incubation period of 17 to 25 days, with de average of 20.6 ± 0.9 days. The egg length ranged from 3 to 5 mm. Female longevity ranged from 28 to 38 days, with an average of 32.5 ± 3.5 days, and the males from 3 to 9 days, with an average of 5.8 ± 1.9 days. The newly hatched larvae measured from 4 to 6 mm in length. The larvae were maintained on the artificial and modified diet for 2 years, passing through 6 and 7 moults. The adults showed significant color and size variations, but only the species M. fryanus was detected.
KEY WORD
Migdolus fryanus
; sugarcane; biology; morphology; artificial diet
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