JJ 



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Fabricius l (1775), who writes, "sheath exserted, uuivalvular, flexible, with five 

 setae;"* Jordens 18 (1801) describes four setae;** Gravenhorst 15 (1817), "The 

 proboscis long, setiform, five-parted;*** Meigen 16 (1818) describes four setae and 

 figures five;f Gerstfeldt 3 (1853), "The sheath is formed of the under lip alone, 

 and contains six setae;" ft Packard 17 (1869), "These six bristle-like organs are 

 folded together within the hollowed labium;" ftt Clausal 876) writes, proboscis 

 "extended with four setae." 



EoFFKEDRi's paper, 20 in 1769, upon the mouth-parts of Culex, I know only 

 by title. 



Without being unduly influenced by one or another of the authorities above 

 mentioned, I will set forth the structure of the mouth-parts of Cide.e, both male 

 and female, as I have found them in my own observations, in the following pages. 



THE MOUTH-PARTS OF CULEX, FEMALE. 



The mouth-parts which form the proboscis of the female Culcx, as I have 

 found them by study of C. rufus, C. ciliatus and C. pipiens, represent all the 

 typical mouth-parts of different insects, and consist of a labrum (PI. 1, fig. 1, A 1 .), 

 an epipharynx (e), a hypopharynx (/*), two mandibles (w) and two maxillae (m.r), 

 all sheathed, when in repose, in the labium (/), which receives them into a groove 

 on its upper side. Each maxilla has a maxillary palpus (m p) which lies outside, 

 and at the base 'of, the labium; the latter has no palpi, unless one regards, as 

 Erichson did, the lobes at its tip to be palpi. Of these mouth-parts the labium 

 and maxillary palpi are covered with hair and scales, the others are naked, light 

 brown, setiform and transparent; they all originate at the anterior basal portion 

 of the head, below the eyes and antennae (a), and are, with the exception of the 

 maxillary palpi, of about equal lengths, that is, about three to four times the 

 length of the head. The maxillary palpi, in the females of Cule.r proper, are 

 about the length of the head. Those mouth-parts which are without scales, and 



* "Vagina exserta, univalvis, flexilis, setis quinque." (p. 799.) 

 ** P. 162, of Band I. 



*** "Der Riissel lang, borstenfb'rmig, fiinftheilig." (p. 44.) 

 f P. 2 and pi. i of Theil I. 



ff "Die Scheide wird von der Unterlippe allein gebildet und enthalt sechs Borsten." 

 (p. 32.) 



tff P. 369-370. 



" Vorgestreckt mit 4 Stechborsten." (p. 682.) 



