KOXGL. SV. VET. AKADEM1ENS HANDL1NGAR. BAND 22. N:0 7. 381 



The head is somewhat shorter and deeper than in the female, being twice as deep 

 as long; it is shorter than the first three pereeonal segments together. 



The first pair of antenna; (PL XVI, fig. 28) are inserted near the lower end of the 

 head. The first joint of the peduncle is somewhat longer than the two following together. 

 The first joint of the flagellum is elongate-ovate, tumid, and thickly covered with olfactory 

 hairs; it is more than three times as long as the whole peduncle, and is nearly twice as 

 long as the head. The following flagellar joints are five or six in number, increasing in 

 length towards the apex. 



The second pair of antennas (PL XVI, fig. 29) are longer than the first, and reach 

 to the front margin of the seventh pergonal segment; they are inserted closely beneath 

 the first pair, just at the lower end of the front side of the head. The first free ped- 

 uncular joint is as long as broad, the second and third are longer, and arc equal in 

 length. The first joint of the flagellum is long and slender, somewhat longer than the 

 whole peduncle. The following flagellar joints are shorter, subequal in length, and are 

 fringed on the under margin with minute hairs. The flagellar joints are twelve or thirteen 

 in number. 



The labrum (PL XVI, fig. 30) is comparatively small; it is bilobed at the hind 

 margin. 



The mandibles (PL XVI, fig. 31 and 32) are strongly developed. The stem is long 

 and broad, slightly excavated on the inner side, and attached to the inner side-wall of 

 the mouth-cavity with its base and outer margin. The incisive lamina is broad and thick, 

 crenulated along the free margin, and furnished with fine bristles along the base of the 

 crenulation. At the inner side of the incisive lamina project two strong, blunt processes, 

 and at the outer side of the same lamina there is a thick bundle of strong bristles. The 

 molar tubercle is long, but comparatively narrow, placed rectangularly to the incisive 

 lamina, and is strongly crenulated, and provided with long, sharp spines and fine hairs. 

 The interior of the stem is occupied by well developed, large glands. 



The labium (PL XVI, fig. 33) has the lateral lobes very large and irregularly 

 rounded; the median incision is squared, and fringed with minute hairs. 



The first pair of maxilla! (PL XVI, fig. 34 and 35) have the stem robust, and filled 

 with glands. The principal lamina is circularly hollowed, and has the margins fringed 

 with stout bristles. The secondary lamina is long, feebly curved, and irregularly tapering 

 towards the apex, where it carries a single bristle; it is provided at the inner side with 

 a rectangularly projecting incisive lobe, which is strongly serrated along the lower half 

 of its free margin. 



The second pair of maxilla! (PL XVI, fig. 36) have the principal lamina narrow, 

 and thickly covered with hairs at the apex. The secondary lamina is longer, and is 

 thickly set with hairs. 



The maxillipeds (PL XVI, fig. 37 and 38) are very large, with the stem broad and 

 nearly linear. The lateral lamina; are elongate, with the apex bent inwards; the outer 

 margin is feebly S-shaped, and is smooth; the inner margin is convex, and strongly serrated. 

 The median lobe is unusually strong, with the basal portion very broad and the apical 

 portion forming a bluntly rounded process, which is covered with short hairs. 



