. Guide leaflet. thin their pupal integument. Photographfrom life, greatly enlarged. which the muscles of the insect are attached. Wherever rigidity isrequired, the chitinous coat is thickened, but elsewhere it remains thinto permit movement of the body segments. Three main regions of the body may be easily distinguished, the smallDivisions rounded head with its appendages, the relatively large tho-of Body rax a)1(j t]ie elongated abdomen (Figs. 1 and 17). The head,which is connected with the bodv bv means of a rather slender neck, DAHLGREN, THE MALARIA MOSQUITO 23 bears the mouth-parts and sp

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. Guide leaflet. thin their pupal integument. Photographfrom life, greatly enlarged. which the muscles of the insect are attached. Wherever rigidity isrequired, the chitinous coat is thickened, but elsewhere it remains thinto permit movement of the body segments. Three main regions of the body may be easily distinguished, the smallDivisions rounded head with its appendages, the relatively large tho-of Body rax a)1(j t]ie elongated abdomen (Figs. 1 and 17). The head, which is connected with the bodv bv means of a rather slender neck, DAHLGREN, THE MALARIA MOSQUITO 23 bears the mouth-parts and special sense-organs. The thorax, which consists of three closely consolidated segments, bears the organs of loco-motion, the lees, one on each segment, the wines on the middle seemenland a pair of minute balancers on the third. The abdomen is distinctlysegmented and consists of eight rings, but, except on the terminal seg-ment, it bears no appendages. The almost spherical head is somewhatflattened in front. TARSUS. FiG. 17. MALARIA MOSQUITO MALE. Magnificat ion 7 diameters. The anterior portion of the head is occupied by two large compound . each composed of several thousand simple eve- or facets, regularly arranged and so closely crowded together that their outlines . appear hexagonal. In such compound eyes each separate facet receive- ravs of lighl from only a single direction, hut the great Dumber 24 AMERICAN MUSEUM GUIDE LEAFLETS of facets distributed over a spheroidal surface makes it possible for themosquito to see in almost every direction. In front of the eyes are the antenna?, two slender organs, with a cen-tral jointed axis of 15 or 16 segments, each bearing a whorl of fine hairs.The antennae are organs of hearing, and by means of them the male isable to detect the presence of the female. If the song ofa female mosquito be imitated with a timing fork, theantenna1 of the male mosquito, which support long and exceedinglydelicate whorls of hairs (Fig. 1), that respond to