8 Carl Bovallius, 



eye, detached from the head mass probably in an early period 

 of the development; it is composed of three ocelli. The pigment is 

 deep black. 



The first pair of antennœ [PI. I, fig. 2] are a little different in 

 the male and the female; the peduncle is three-jointed, the first joint 

 thick and long, the second scarcelj^ as long as half the first, the 

 third as long as half the second. The secondary flagellum consists of 

 two joints, the first thick, five times longer than the second, beset with 

 five to six bristles. In the male it is longer than the first joint of the 

 true flagellum, in the female it equals the same joint in length. [PI. I, 

 fig. 3]. The true flagellum consists of a long, conical, a little tumid joint, 

 like that of the genus Hyperia, carrying long hairs; then follow in the 

 male nine, in the female four narrow joints, the terminal being the 

 longest, with a long hair at the apex. In the male the first pair of 

 antennae reach to the anterior margin of the fifth segment, in the fe- 

 male scarcely to that of the fourth. ^ 



The second pair of antennœ [pi. I, fig. 2 a] are about twice longer 

 than the first. The first joint of the peduncle is rounded, as long as 

 broad, the second very short, the third linear, as long as the two pre- 

 ceding together, the fourth is the longest, with minute hairs along the 

 anterior margin, the fifth as long as the third, with a long hair at the 

 lower anterior corner and minute ones along the anterior margin. The 

 flagellum consists in the male of 18, in the female of 12 articuli, in 

 the male every one carries two minute hairs at the upper anterior corner. 

 The flagellum is longer than the peduncle. The second pair of antennae 

 reach in the male to the first ural segment, in the female to half the 

 second pleonal segment. 



The mouth-organs are well developed, constructed for mas- 

 tication. 



The lahrnm [PI. I, fig. 4] is divided 'into two semicircular pro- 

 jections, which are fringed with strong hairs, feebly curved at the ends. 



The mandibles [PL I, fig. 5] are very strong; a little beyond the 

 middle projects a thick, rounded, molar tubercle, whose grinding surface 

 is provided with 10 curved, strongly denticulated crests [PI. I, fig. 6]; at 

 the outer side of the molar tubercle there is a bundle of denticu- 

 lated spines and bristles. Then follows a deep excavation with a row 

 of five long bifid spines [PI. I, fig. 7]; the end of the mandible consists 

 of a hollowed process, denticulated at the apex. From the middle of 

 the outer margin of the mandible projects the three-jointed palp; the 



