KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 259 



The male. 



PI. XII, fig. 22—38, and 41—45. 



The body is robust with thin, shining, and pellucid integument. 



The head, is tolerably compressed, more than twice as deep as it is broad. The 

 antennal groove commences at the middle of the front side, and is narrow. 



The eyes occupy the whole surface, of the head. 



The first pair of antennce (PI. XII, fig. 44) are scarcely more than half as long as 

 the second, and reach a little beyond the hind margin of the sixth pergonal segment. 

 The first joint of the peduncle is very large, fully four times as long as the two follow- 

 ing joints together, and is considerably longer than broad; the second and third joints are 

 about equal in length. The first joint of the flagellum is a little shorter than the whole 

 peduncle, conical, and fringed with long olfactory hairs along the inner side; the second 

 and third joints are short, equal in length, and as long as broad; the following are 

 slender, cylindrical, increasing in length, and fringed with fine hairs along the under 

 margins; the last joint is more than five times as long as broad; the flagellar joints are 

 fifteen in number. 



The second pair of antenna? (PL XII, fig. 45) reach fully to the hind margin of 

 the first ural segment. The first free joint of the peduncle is about as long as broad, 

 and is a little shorter than the second; the third is about as long as the two preceding 

 together, and is fringed with fine hairs along the under margin. The first joint of the 

 flagellum is as long as the last peduncular joint; the following are rather decreasing in 

 length, all fringed with very short hairs along the under margins; the flagellar joints are 

 twenty-eight to thirty in number. 



The labrum (Pi. XII, fig. 22) is deeply bilobed, with the lobes bluntly triangular. 



The mandibles (PI. XII, fig. 25 — 27) are very robust; the incisive lamina is broad, 

 angularly bent inwards, and has at the inner corner two strongly projecting larger teeth, 

 the following teeth bordering the lamina are equal in size, and are sharp-pointed; at the base 

 of the lamina the inner margin is thickly set with long bristles. The accessory lamina of the 

 left mandible is constricted at the base forming a neck, and is fixed on a disc-like pro- 

 minence on the side of the mandible; the margin is bordered with strong teeth. The 

 molar tubercle is very large, and narrow; it is fringed round the margins with long sharp 

 teeth, and on the inside of these teeth there is a row of blunt conical tubercles, each 

 tipped with a thick, obtuse, and strongly serrated spine, which possibly is a kind of taste- 

 organ (PI. XII, fig. 26); the middle of the molar tubercle consists of the grinding sur- 

 face, which shows blunt teeth and pebble-like prominences. The mandibular palp is long, 

 fixed on a tuberculous prominence on the outer side of the stem of the mandible; the 

 first joint is slender and cylindrical; the second joint is more than half as long again as 

 the first; the third is a little longer than the first, and tapers towards the apex. 



The labium (PI. XII, fig. 23 and 24) consists of two strongly convex lobes, densely 

 set with short spines on the sides, and fringed along the under convex margins with a 

 row of long, conical, tooth-like spines, each of which is strongly pectinated along the outer 

 side (PL XII, fig. 24). 



