MORPHOLOGICAL STUDIES ON SOME EXTERNAL AND INTERNAL STRUCTURES OF RICE WEEVIL, Sitophilus oryzae (L.) (COLEOPTERA: CURCULIONIDAE), A MAJOR PEST OF THE STORED CEREALS IN EGYPT

The morphology and anatomy of some important structures of S. oryzae have been described. All major differences between the two sexes, in respect of habitus, rostrum, olfactory sensilla of antenna, eyes, pronotum, mesonotum, metanotm, metendosternite, abdomen, propygidium, pygidium, proventriculus, male and female genitalia have been fully discussed and figured. The main differences between male and female of S. oryzae are, in a side view, the ventral surface of the female is in a straight line, but in the male it is curved posteriorly; the rostrum in the male is smaller and thicker and less curved than in the female and is dorsally, dull and closely punctured, but in the female, shining and sparsely punctured and The number of ommatidia in male (~ about 167) is more than female (~ about 154). Other differences in the rest of structures are shown below.