454 CALIFORNIA ACADEMY OF SCIENCES. 



square, and has its anterior border slightly emarginated 

 and the anterior outer angles projecting a little. This 

 lobe is thus composed of the glossal, which are separated 

 only by the anterior emargination. The lateral lobes are 

 rounded and bear the cylindrical paraglossae. These are 

 almost identical with the paraglossae of Eurymetofiiis, 

 being also more strongly chitinized than the rest of the 

 labium, and bearing on their slightly expanded ends a few 

 strong hairs with basal segments. They project ventrally 

 and a little inward and forward, the distal ends being 

 nearly always seen first on focussing down on a specimen 

 toward the ventral surface. 



Back of the submentum is a narrow gular sclerite con- 

 tinuous across the median line from the lateral portions 

 of the head. 



The maxilla (plate lxi, fig. 6) are soft unchitinized struc- 

 tures lying within the mouth cavity. Each is divided into 

 three lobes: one basal, another terminal, and the other 

 between these two. By the basal lobe the maxilla is 

 attached to the wall of the head, and it projects inward 

 into the mouth cavity. It is irregularly round in outline 

 and is entirely unchitinized. The middle lobe is of about 

 the same size as the first, and is joined to the latter by a 

 constricted neck. This lobe projects forward and inward 

 within the cavity of the mouth. The third lobe is the 

 largest and is oval in profile, with the long axis at right 

 angles to that of the middle lobe, to which it is attached 

 by a narrow neck at its inner and posterior aspect. This 

 lobe, as well as the middle one, is entirely unchitinized. 

 It projects out of the mouth cavity, and lies close behind 

 the mandible of the same side. 



The mandibles (plate lxi, figs. 8 and 9) are large and 

 strong; their bases lie some distance back of those of 

 the antennae ; they hang downward from the head in a 



