362 " PROCEEDINGS OF THE NATIONAL MUSEUM. vol.39. 



fair regularity; second segment very short and well rounded at the 

 sides. Third and fourth segments about the same width as the second 

 segment anteriorly but considerably narrowed posteriorly. The third 

 segment covers dorsally the whole of the fourth and a part of the fifth 

 segments; its contour can be well seen in side view (figs. 129 and 139). 

 The fifth segment is nearly as wide as the fourth but much shorter; 

 the genital segment is not enlarged and its sides are straight. 

 The abdomen is three-jointed, the joints diminishing regularly in 

 width, the terminal one the longest, with a deep anal incision on its 

 posterior border. The anal laminae are rectangular, wider than long, 

 each armed with two unequal setae, the inner one more than twice the 

 length of the outer. The egg-cases are elliptical, the same width as 

 the genital segment and about one-third the entire body length. The 

 eggs are of medium size and arranged in six or seven longitudinal 

 rows, about sixty or seventy-five in each case. 



The first antennas are narrow and of medium length; the three 

 terminal joints are distinctly marked, while the three basal ones are 

 well fused. The terminal joints are sparingly armed with settB and 

 there is no tuft at the tip. The basal joints are heavily armed with 

 stout and coarse setae mixed with slender tactile hairs; attached to 

 their ventral surface on each antenna is a narrow chitin plate, which 

 points diagonally forward and is split into three flattened spines of 

 about equal length. 



The second antennae are two-jointed, tlie terminal joint roughened 

 with rows of short spines and tipped with three curved claws. 



The labrum is transversely elliptical, one-third wider than long and 

 perfectly smooth. The mandibles have two stout basal joints besides 

 the cutting blades; the proximal joint is considerably enlarged, the 

 second joint is long and narrow, the terminal cutting blade is shorter 

 than the second joint and is armed with a fringe of short hairs along 

 both margins. 



The first maxillae are knobs of large size, each armed with three 

 widely divergent setae. The second maxillae have a powerful basal 

 joint and a cutting blade, whose triangular base is as wide as the basal 

 joint, but is abruptly narrowed into the slender cutting portion, which 

 is half as long again as the basal joint, and is armed along its anterior 

 border with a row of stout hairs. The shape of this cutting blade and 

 its mode of attachment to the basal joint is totally different from that 

 found in Bomolochus species, and illustrates one of the characteris- 

 tics of the genus. 



The maxillipeds are also peculiar; they are very large and the 

 triangular basal portion is attached well forward so that its distal end 

 is opposite the second antennae. From this end projects the terminal 

 claw which is bent into an almost perfect S-shape, and does not show 

 the abrupt curve found in ardeolse. This claw is also perfectly smooth, 



