Abstract
The first and final larval instars of Amblycerus acapulcensis and A. robiniae are described and compared morphologically and ethologically.First instar characters used were those of the chaetotaxy, head, antennae, prothoracic plate, legs, spiracles, and anal sulcus.Final instar characters used were those of the antennae, clypeolabrum, epipharynx, mandibles, maxillae, labium, legs, spiracles, and anal sulcus.The ovum, ovipositional behavior, pupation, and post emergence activities are discussed.Larvae of the seed weevils feed primarily within the seeds of leguminous plants.However, excepting a few economic forms, the activities of most bruchids remain unnoticed.The species discussed here are A. acapulcensis, which feeds mostly upon native Caesalpinia cacalaco Humb.and Bonpl., and A. robiniae, which feeds on native and/or cultivated varieties of Gleditsia triacanthos L.Larval descriptions are of significance in revealing congruency or incon gruency within the adult classification scheme.Moreover, additional infor mation on ovipositional behavior, eggs, larval behavior, and pupation will provide substantial intra-and interfamilial phylogenetic clues.
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