136 PROCEEDINGS OF THE NATIONAL MUSEUM vol. in 



Diagnosis: A large species of Atopetholus in which the accessory 

 process of the anterior telopodite is rather small and directed caudo- 

 laterad instead of distad as in most other species, and in which the 

 tip of the posterior gonopod is recurved proximad, the lower edge of 

 the telopodite being subterminally serrate and the upper edge pro- 

 duced mesiad into an acute lobe at about the midlength. 



Description (male paratype) : Front of head smooth and polished, 

 mth several transverse (about 12) grooves between the antennae; 

 genae smooth; labral teeth very low and broad, almost obliterated; 

 labral pores 5-5; ocellaria nearly round, the intervening space almost 

 four times the diameter of an ocellarium; antennae moderately long, 

 extending back to second segment, the first 3 articles glabrous, 

 second article longest, third through seventh gradually decreasing in 

 size. Exposed surface of mandible flat and subcircular, with a distinct 

 marginal ridge. 



Collum smooth and polished, somewhat flattened dorsally; second 

 tergite with about six shallow grooves on each side behind ends of 

 collum, the pleural lobe merely depressed without a distinct anterior 

 flared rim. 



Body segments smooth and shining, ^vith only one distinct trans- 

 verse suture passing well behind the ozopore ; the lower sides of tergites 

 with small, poorly defined longitudinal striations. Last three seg- 

 ments strongly telescoped; telson very short and blunt, not concealing 

 the anal valves in dorsal aspect, the valves evenly convex, smooth and 

 polished, the preanal scale small and flat. Sternites trapezoidal, with 

 about six to eight fine transverse ridges; adjacent surface of pleurites 

 flat and smooth. Legs moderately long and slender, lengths of joints 

 in order of decreasing length 6, 3, 2, 1, 4, 5; tarsal claw long and 

 slender. Ventral setal formula : 1-1-3-3-3-6. 



First two pairs of legs crassate, with a large robust claw; legs 3-7 

 normal in size and shape, their tarsal claws not reduced, the tarsi not 

 depressed or modified. Coxal lobes subtriangidar, moderate in size, 

 increasing slightly from third to seventh ; pleurites of seventh segment 

 forming a high transverse crest, fused mesially and slightl}^ overhang- 

 ing caudally. 



Male gonopods are discussed briefly with respect to general form 

 and the musculature on page 107. In the lack of comparative material, 

 it is difficult to single out what might be specifically diagnostic in the 

 gonopod structure, although some presumably diagnostic features have 

 been listed in the foregoing diagnosis of the species. The anterior 

 sternite is rather massive and somewhat pitted over its surface, par- 

 ticularly the intercoxal vincular portion. The base of the posterior 

 telopodite is produced proximally into an elongate lobe for the attach- 

 ment of retractor muscle "6." 



Color (from original description) : 



