MORPHOLOGY OF SENSORY STRUCTURES ON THE ANTENNAE, MAXILLARY AND LABIAL PALPI, TARSI, AND OVIPOSITOR OF ADULT CALLOSOBRUCHUS-MACULATUS AND C-SUBINNOTATUS (COLEOPTERA, BRUCHIDAE)

The sensilla on the antennae, maxillary and labial palpi, tarsi and ov ipositor of adult Callosobruchus maculatus (F.) and C. subinnotatus (P ic) were examined using light and scanning electron microscopy. Six ty pes of antennal sensilla occur in both species. Type 1 are long and ha ve longitudinal ridges and a conspicuous basal socket. These sensilla occur in rings at the distal margin of each antennal segment; the term inal segment bears 2 such rings. Type 2 sensilla are found on all segm ents and have a well developed basal socket and less conspicuous cutic ular ridges. Type 3 sensilla are numerous and found only on flagellar segments. Type 4 sensilla are medium in length and stout. Types 5 and 6 sensilla are short, few, and are found along with type 4 sensilla in groups distally on the distal antennal segments. Types 1 and 2 are se nsilla chaetica, type 3 are trichodea, and types 4, 5, and 6 are sensi lla basiconica. Sexual dimorphism in numbers of antennal sensilla is o bserved. Maxillary and labial palps in both species have 3 types of se nsilla. Two subtypes in type 3, fluted (3a) and blunt (3b), sensilla a re observed in females of both species. Tarsi and ovipositor of both s pecies have 3 types of sensilla each.