KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 171 



thiin tho first, and broader thaii long; the third or last pediinculai- joirit is shoi^tev thaii tlie 

 tvvo preceding ones together, tapering, and Avith soniewhat bulging sides. The first joint 

 of the flagellum is nbout as long as the last peduncular joint; the second joint is not hnlf 

 as long as the first; the following joints are eqiuil in length, as long as the second, cy- 

 lindrical, and about twelve times as long as broad; each joint is provided with a few 

 hairs; the last flagellar joint tapers towards the apex, and is about ten times as long as 

 broad at the base. The nutnber of flagellar joints is about the same as in the first pair. 



The labrum (Pl. IX, fig. 37) is broader than long, and bilobed; the incision between 

 the lobes is not deep; it is sparingly provided with minute hairs. 



The mandibles (Pl. IX, fig. 38 — 40) have a thick and stout stem, feebly bent inwards 

 at the apex. The incisive lamina is curved, and armed with three longer and four smaller 

 sharp teeth. The molar tubercle is very large; the grinding surface is ovate, fringed with 

 a dense row of long stout spines; the outer margin is armed with a row of simple or 

 double-pointed teeth; between these teeth and the spines the grinding surface shows regular 

 rows of small rounded tubercles like pebbles (Pl. IX, fig. 40). The secondary in- 

 cisive projection of the left mandible is irregularly triangulär, and armed with four sharp 

 teeth. On the outer side of the stem of the mandible there is a tubercular prominence 

 on which the palp articulates; the first joint is slender, cylindrical, and nearly four tiuies 

 as long as broad; the second joint is only a little more slender than the first and some- 

 what longer; the third joint is narrower and shorter than the second, tapering, feebly 

 curved, and fringed along the convex upper margin with very minute hairs (Pl. IX, 

 fig. 38). 



The labium is broad, the median projection is rounded, and almost as deep as the 

 lateral projections which are tongue-shaped, and smooth. 



The first pair of maxillce (Pl. IX, fig. 41) consist of a very short, thick, basal joint 

 and two laminte. The principal lamina is much longer than the basal joint; the apical 

 portion is broad, feebly curved and concave; the margins are provided with hairs and bristles; 

 on the under, almost truncated margin there are three equidistant, strong spines. The 

 secondary lamina is feebly concave and bent över the apical process of the principal 

 lamina; the convex margin is armed with irregular teeth, and the lower inner corner 

 with a short, stout spine. 



The second pair of maxillce (Pl. IX, fig. 42 and 43) consist of two lamina^. The 

 principal lamina is broad at the base; the apical portion is strongly curved and tapering; the 

 rounded tip is covei^ed with long hairs, most of which are club-shaped; just at the apex 

 there are a few long, strong spines. The secondary lamina is fully as thick as the 

 principal, armed at the apex with two strong spines, and provided with long club-shaped 

 hairs. (Pl. IX, fig. 43). 



The maxillipeds (Pl. X, fig. 2 and 3). The basal portion is very broad at the 

 base, tapering, and strongly bent. The lateral lamina3 are ovate; the inner margins are 

 feebly undulate, and set with a few small tufts of very short hairs. The median lobe forms 

 a large triangulär process; the inner or front margin is densely set with long hairs. 



The peroion. The first segment is fully as long as the second; the seventh segment 

 is as lonof as the sixth. 



