340 



Mnv /. 



rostrum bears an additional pair of hairs. Thiderneath the 

 rostrum may lie seen the mouth-parts, which consist of man- 

 dibles (Fig. 2), palpi (Fig. 3, Pa.), maxilla? 

 (Fig. 3, Ma.c), and the maxillary lip (Fig. 3, 

 Md.r. /.). From the maxillary lip project the 

 maxillte and the palpi. The niaxilk^ are 

 curved and blade-like, and are large and 

 highly developed in the genus Hoplodeniia. 

 The palpi consist usually of five segments, 

 and as a rule are very small; in the genera 

 I'hthiriiciifiis and Ilop/ixJeniHi, however, they 

 are large. On the posterior part of the 

 cephalothorax are found the following 

 organs: pseudostigmata, psendostigmatic 

 organs, lamella?, lamellar hairs, interlamellar 

 hairs and sometimes a translamella, and often one or more 

 pairs of tectopedia. The pseudostigmata (Fig. 4, F.s. ). formerly 

 supposed to be the true stig- 

 mata, are situated near the 

 abdominal margin and usually 

 close to the lateral nuirgin of 

 the cephalothorax. They are of 

 various forms, though usually 

 cylindrical or funnel shaped. 



Fi(i. 8. Oriliiilii banksi, 

 mouth-parts. 



Psorg. 



Fu 



Oriliala selosa, pseudostigma and 

 psendostigmatic organ. 



From each pseudostigma pro- 

 jects the psendostigmatic organ (Fig. 4, Ps. iinj.). This may 

 be filiform, fungiform, setiform, clavate, or subglobose, and is 

 often pectinate or dentate. The lamelhe consist of either 

 blade-like chitinous projections, or of mere ridges. They 

 vary greatly in size and shape, and are situated on the 

 dorso-lateral part of the cephalothorax. Sometimes the la- 

 melhe project in a free end which may extend to the apex of the 

 rostrum or even beyond it. From the tip of the lamelhe pro- 

 ject a pair of prominent bristles, termed the lamellar hairs. 

 The tectopedia, of which there may be as many as three pairs, 

 are generally blade-like, are situated on the sides of the 

 cephalothorax. and have either a tactile function or serve 

 to protect the coxrt'. 



