Twelfth Report of the State Entomologist 



327 



animals through which to draw their juices, as in the Hemiptera or bugs. 

 These parts exist in all insects, although at times some of them may be 

 but rudimental. The mouth-parts of the female Culex represent all of 

 these typical parts of different insects, and in the formation of its pro- 

 boscis, two other organs unite (as in most of the Diptera) which are 

 the pharyngeal sucking organs, named the epipharynx and the 

 phyopharyjix. 



It therefore appears that the proboscis of the mosquito, which in its 

 normal condition seems but a single piece, upon dissection or close 

 examination is found to consist of seven distinct pieces — eight pieces in 

 reality, but two so combine as to form one. Some authors have stated 

 the number of pieces at four, five, or six, but there certainly are as many 

 as seven in Ctilex pipiens, C. ciliatiis and C. riffns which have been 

 carefully studied, and it is not probable that the number will be found 

 to differ in other species when examined. 



These pieces are shown in the accompanying figure. The upper piece, 

 pointed and gradually tapering from the base to the apex, is the labrum- 



Fig. 9. — Mouth parts of the mosquito, lateral aspect. (After Dimmock.) 



epipharynx, made up by the close union of the labrufu and the epipharynx. 

 Below it is the hypopharytix, a linear, lanceolate, transparent plate, having 

 a longitudinal rod (appearing as if tubular in some species) traversing it 

 in the middle, through which, it is thought, the poisonous fluid which we 



