. Elementary entomology . FIG. 10. Face of grasshopper ant, antenna; cl, clypeus ; eye, compound eye ; lab, labium ; Ibr, labrum ; , labial palpi; , maxillary palpi; oc, ocellus 27,000 in certain sphinx moths. Between the compound eyes, on the front, or vertex, of the head, are two or three small oval or circular simple eyes, called ocelli. Caterpillars and other larvae have no compound eyes, but on either side of the head have a group of from four to six ocelli. In many flies and bees the com- pound eyes of the male are larger and closer together than those of the female, this being d
. Elementary entomology . FIG. 10. Face of grasshopper ant, antenna; cl, clypeus ; eye, compound eye ; lab, labium ; Ibr, labrum ; , labial palpi; , maxillary palpi; oc, ocellus 27,000 in certain sphinx moths. Between the compound eyes, on the front, or vertex, of the head, are two or three small oval or circular simple eyes, called ocelli. Caterpillars and other larvae have no compound eyes, but on either side of the head have a group of from four to six ocelli. In many flies and bees the com- pound eyes of the male are larger and closer together than those of the female, this being due, possibly, to the male's leading a more active life. Mouth-parts. The mouth-parts are of prime importance, both from an economic and from a systematic standpoint. Upon their structure depends the kind of insecticide which may be effectively
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