CANTHOCAMPTUS. 49 



life, but abdomen after death bent to a right or acute 

 angle on the thorax. Head coalescent with first 

 thoracic segment, rostrum short and blunt. Abdo- 

 men 4- jointed, the first joint being very large and 

 formed by the fusion of two rings ; lower border of 

 each ring finely pectinated; the last joint produced 

 downwards at the dorsal angle into a short spinous 

 process. Anterior antennae slender, 8-jointed, about 

 as long as the first cephalothoracic segment, all the 

 joints nearly equal in length except the fifth, which is 

 very short, and the last, which is the longest and most 

 slender; the fourth joint has attached to its apex a 

 stout rod-like seta (fig. 2 a). The second antenna is 

 moderately long, 2-jointed, and has a small biarticu- 

 lated branch affixed to the inner margin of the basal 

 joint (fig. 8). The mandible (fig. 4) is stout and bears 

 a small biarticulated palp. The main stem of the 

 maxilla (fig. 5) is divided at the apex into several claw- 

 like segments, and has two lateral lobes, one large and 

 bearing numerous setae, the other slender and having 

 only one apical claw; on the opposite margin is a 

 small bisetose tubercle. The first foot-jaw is divided 

 at the apex into three claw-bearing segments (fig. 6) ; 

 the second (fig. 7) is 3-jointed and narrow, the last 

 small and slender, terminating in a long, curved claw, 

 and a small seta. The inner branch of the first foot 

 (fig. 9) is about twice the length of the outer (which 

 reaches only to the apex of its first joint), the second 

 joint is short, and forms at its junction with the pre- 

 ceding a flexile hinge ; the last joint, which is long 

 and slender, has at its apex one very long, and two 

 VOL. n. D 



