365 



Mxsk 



Pist 



SM 



Hst 



Ask 



Fig. 1. — Head, ventral 

 aspect. Ask, antennal 

 sclerit; B, basal joint of 

 the ma.\illary palpus; C, 

 ,Mdf cardo; H, stipes palporum 

 labialiuni; Hst, Hyposto- 

 iiia; I, the maxillary inner 

 lobe or lacinia; M, the 

 chitinized antei'ior border 

 of nientum (the rest of 

 mentuni is softwalled and 

 more or less conceiled in 

 SM, the submentum); 

 Mdf, concave fossa in the 

 hypostoma of ventral arti- 

 culation for the mandible; 

 Mxsk, maxillary sclerit in 

 * the lateral lobe of sub- 



mentum; 0', terminal joint of the maxillary outer lobe, or galea; P, 

 præbasal joint of the maxillary palpus; Plst, pleurostoma; s, posterior 

 end of the gular suture; SM, submentum; t, posterior end of hypostoma 

 and the place of the ventral fixation of tentorium. 



E 



Fig. 2. — Head, dorsal aspect. 1 + 2 + 3, areæ accommodating 

 the pharyngeal muscles; 1, manubrium; 2, arm part; 3, ensiform part; 

 4, area accommodating the retractor mandibulæ; 5, and 6, area ac- 

 commodating the protractores mandibulæ ; Am, area accommodating 



