156 



HARDWICKE'S SCIEN CE-GO S S IP. 



II. — The labium, consisting of — 



1. An external plate or mentura. 



2. An internal do., forming the floor of the 



mouth. 



3. A plate attached to the anterior border of 



the last named. 



4. A pair of lobes. 



ni. — The maxillae and their palpi. 

 In addition to these I must notice a fourth organ, 

 viz , the pharynx, concerning which 1 am somewhat 



the proboscis of the Blow-fly, and shall therefore in- 

 clude it in my account of the mouth organs here. 



Fig. 97. General view of mouth organs of Crane-fly, x 24 — r, 

 rostrum ; If, labrum ; lb, labium ; mx, maxill2e ; rr>p, max- 

 illary palpi. 



doubtful whether it can properly be regarded as a 

 portion of the mouth and not rather as the distended 

 commencement of the oesophagus. I find it, however, 

 difScult to persuade myself that it is not the horao- 

 logue of that which Mr. Lowne has described under 

 the same name as forming part of the basal joint of 



Fig. 98. The labium from beneath, x 48— W, the lobes ; ir.r, 

 maxillse ; mt, mentum. 



Fig. 99. One of the main false Fig. 100. Terminal portion 

 tracheae, with branches, X 210. of salivary duct, x 210. , 



Fig. 101. Fig. 102. 



Fig. 101. Anterior section of pharyn.x (the lettering in thl^ 

 and following figs, indicates the position of the muscles) 

 X 90. 



Fig. 102. Posterior section of ditto, x 90. 



It will be noticed that the above enumeration does 

 not include, 1st, the mandibles; 2nd, the para- 

 glossse ; 3rd, the labial palpi ; and 4th, the tongue. 



