ANATOMY AND I'll 



Diptera. In tin- female mo^jiiito tin- mouth juris (Fig. 55) are 



long and slender. A^ l)immotk found, the labrum and epiph, 

 combine 1 to form a Micking tube; the mandible^ and maxilla- are del 

 linear, piercing organs, the latter bring barbed di-1ali ;llary 



palpi are present; the hypopharynx i> linear ftlftO and -' t ves to condu< t 

 saliva; tin- labium t'onns a >heath, i-nclo>in.^ the other mouth parls 

 when they arc- not in USCJ a pair of si-n>ory lol)e>. termed /ihrll,!. occur 

 at tlu- i-.xtreinity of tin- labium. 



FIG. 55. Mouth parts of female mosquito, Culex pipiens. A, dorsal aspect; B, trans- 

 verse section; C, extremity of maxilla; D, extremity of labrum-epipharynx; a, antenna; e, 

 compound eye; h, hypopharynx; /, labrum-epipharynx; li, labium; m, mandible; mx, 

 maxilla; p, maxillary palpus. B, after DIMMOCK. 



The oesophagus is dilated to form a bulb, or sucking organ, from 



which muscles pass outward to the skull; when these contract, the 



bulb dilates and can suck in fluids, as blood or water, which are forced 



into the stomach by the elasticity of the bulb itself, according to 



Dixnmock; the regurgitation of the food is prevented by a valve. 



The male mosquito rarely if ever sucks blood, and its mouth parts 

 ditter from those of the female in having the mandibles aborted and the 

 maxilhe slightly developed, but with long palpi, while the hypopharynx 

 coalesces with the labium and there is no u-sophageal bulb. 

 1 Kulagin, however, described them as remaining 



