JOUENAL 



OF THE 



ROYAL .MICROSCOPICAL SOCIETY. 



FEBRUARY. 1909. 



TRANSACTIONS OF THE SOCIETY. 



I. — The Mouth-parts of the Nemocera and their Relations to 

 the other Families in Diptera. Corrections and additions 

 to the paper published in 1904. 



By W. YYesche, F.R.M.S. 



(Bead October 21, 1908.) 

 Plates I. to IV. 



A taper covering so wide a field as the one referred to above, 

 cannot be, nor had it any pretensions to be exhaustive, and the 

 exceedingly minute size of many of the parts examined, and the 

 occasional failures of preparations to give clear views, have caused 

 one or two mistakes in the homology, and two species have been 

 wrongly determined. On the other hand, many more species have 



EXPLANATION OF PLATE I. 



Note. — The following letters are used throughout the plates. 

 m Mandible. pr Paraglossa. 



I Lacinia. 



g Galea. 



mp Maxillary palpus. 



pf Palpifer. 



s Stipes. 



c Cardo. 



Maxilla. 



Ig Ligula. 



72> Labial palpus. Labi 



p g Palpiger. 

 mn Mentum. 

 s vi Submentuni. 



I r Labrum. 



/; Hypopharynx. p Pharynx. 



pp> Pharyngeal pump. c I Clypeus. 



Fig. 1. — The pharyngeal pump in Culex pipiens L.; dissected out fiom tbe head: 

 the anterior portion is connected with the base of the hypopharynx. 

 which is shown on the right. 

 2. — Section of the head, showing the muscular attachments of the pharyn- 

 geal pump. [Continued vn next /<"." ■ 



Feb. 17th, 1900 b 



