THE GENUS DENDROCTOXUS. 



19 



Labium proper (fiL'- - A . In Demi rod on us and other rhyn- 

 chophorous beetles, the mentum. palpifer. _ and paragL 

 while more or less clearly indicated, are not represented as separate 

 elements of the labium. Mcniuvt: The mentum articulates with 

 the bifid submentum and completely surrounds the basal portion of 

 the labrum. being subcylindrioal, with the anterior ventral area 



.illy ret use. Palpifrr: The palpifer is represented by the area 

 between the ventral impression of the mentum and the row of 

 palpiferal bristles winch define the anterior limit of the mentum. 

 Palpi: The labial palpi are distinct, 3- jointed, and &s long as the 

 mentum, or longer, with the first joint longer than the other two, or 

 rarely equal. Ligula: The ligula 



;ated between the palpi, is 



thickly set with long lacinial teeth, 



and occupies the greater part of 



the dorsal area. It is evident 



that this ligular area represents 



- :*? and paraglossa of other 



insects, and that it is homolo- 



- with the galea and lacinia 



of the first maxilla. 



J/axtfl#(iL: - B, C). The 

 maxilla? (fig. 5, B) have the char- 



ist ic form of those of all other 

 rhynchophorous beetles and are 

 strikingly different from those of 

 ot her Coleoptera . The form, and 

 relative proportions are shown in 

 the figures. Cardo: The cardo is 

 the stout basal section which 

 articulates with a condyle on 



FIG 



.^/)f *drortoL Epistomaia. to / 

 ' D ' " l " pter p to *' D ' 



t he maxillary process of the hy- 

 inal apodeme. Stipes: The 

 stipes articulates with the cardo and, while it does not appear as a 

 separate piece, it is represented by the posterior ventro-lateral and 

 externo-lateral part of the median section of the maxilla. PaL 

 golf a, subgalea, and lacinia: The palpifer is fused with the stipes 

 and is represented by the anterior part of the median section (fig. 5). 

 The palpifer and stipes are also fused with the subgalea on the 

 exto-lateral area, but on the interno-lateral area the line separating 

 the palpifer from the subgalea is distinct, as is also the suture be- 

 n the latter and the lacinia and galea, which are fused, the latter 

 being represented by a narrow chitinous margin next to the palpus 

 and palpifer. The lacinia is armed on the inner edge with stout 

 lacinial teeth. The length of the base of the subgalea from the apex 



