Séance du 21 Avril 1920 27 



Il is sonicnihat liianguhir, pointed l)ehiii(l and ador- 

 ned in Iront hy a spray of beautiCnl long lilanients. 

 Tlie larvae may often be seen to rnn these (ilaments 

 between the strong niandibk's, prol)ably in order to 

 clean them. 



The labrnm is jirominent, setigerous and very mo- 

 \able, being continnously extended and withdrawn by 

 [he living larva. The mandibles are very strong, pal- 

 mate and bent at an elbow, each with ö j)ointed teeth; 

 they are provided with a bunch ol' long setae on the 

 elbow. 



The maxillae are rei)resented by two side plates, 

 which bear setae, and three chitinous, tinger-like pro- 

 cesses. Hetween the maxillae, in the median line, is a 

 comb-like plate, which probably represents the sub- 

 mentum. In front of it, also in the median line is an 

 other comb-like plate or process, but with much bigger 

 and stronger teeth. This structure probably represents 

 the hypopharynx or lingua. Behind this comb are the 

 openings of the salivary ducts. 



The whole of the mouth parts are enclosed in a 

 sunken and roughly triangular space, whicli occupies 

 the anterior pait of the ventral surface of the head. 



The margin of this space has a thick, stilT and 

 chitinous ring. 



The segments of the body arc subdivided by trans- 

 verse constrictions whicli makes it rather diiììcult to 

 separate them. Each thoracic segment consists of two 

 annuii and a trace of a third, but the constriction is 

 not complete, wliile most of the abdominal segments 

 consist of three unnuli. The first al)dominal segineiil 

 has onlv two annuii and the eighth is apparently un- 



