1894. rnovEEDiNGS OF Tii:: xational museum. 47 



ACH.EUS TUBERCULATrS, Mi.-rs. 



Achtnis tihherciilatiiH, Miers, Proc. Zool. Soc. London, p. 25, ISTH. — Ort.mann, Zool. 

 Jahrb., VII, 1, p. 34, 1893. 



To this species I liave referred a single, imperfect, dried specimen (No. 

 18072) from Japan, collected by the Eev. H, Loomis. The cardiac and 

 gastric tubercles are granulate at the summit ; there is a small low tuber- 

 cle on the branchial region near the inner angle, and another near the 

 posterior margin. The hepatic region is swollen ; its projection is broad, 

 granulate on the margin, and somewhat bilobate; from it a granulate 

 ridge runs diagonally to the posterior extremity of the superior orbital 

 border. The inferior snrface of the carapace bears several tabercles 

 and granules near the margin. The rostral teeth are granulate and 

 curved inwards, so that the interspace is almost oval; rostral grooves 

 deep. Secoiid joint of antenna not quite equaling the rostrum. Eye- 

 stalks stout, bearing a small tubercle above near the extremity. 

 Abdomen of male very broad; terminal segment narrowing toward the 

 proximal end, distal angle bearing a smooth prominence; distal margin 

 arcuate in its middle half 



Ohelipeds very large. Merus much larger than the palm, sj^inulous 

 on the margins and with a large lobe at the distal end of the outer sur- 

 face. Carpus spinulous on inner margin, a few tubercles on proximal 

 half of outer surface, and a tuberculous lobe at the articulation with 

 the manus. Manns intiated, spinulous above; palmar portion exceed- 

 ing the poUex but little; digits with a longitudinal sulcus on the outer 

 surface, prehensile edges toothed and fitting together. The ambulatory 

 legs are for the most i)art missing. The dactyl of the last pair is long 

 and slightly curved. 



Measurements. — Length of caraj)ace, lo mm.; width, 1(>.."»; length of 

 dactyl of fourth ambulatory leg, (>. 



This individual corresponds to Miers's brief description taken from 

 imperfect specimens, excepting that he defines the eye-i)eduncles as 

 smooth. In the specimen at hand, the tubercle at the tip is so incon- 

 spicuous that it might have been overlooked. 



ACH.El'S TKITUBERCl'LATUS, new sixties. 



Carapace narrower than in A.japomeus, not constricted behind the 

 orbital area; regions well marked but not protuberant; gastric and 

 branchial regions smooth; cardiac region with three low tubercles, the 

 posterior one on the median line; hepatic region with a broad obtuse 

 prominence. Eostral lobes spinulous on the margin, separated by a 

 V-shaj^ed sinus which is narrower than either lobe. Rostral grooves 

 deep. Eye-peduncle with a sharp pointed tubercle on the upper side 

 near the cornea. The peduncle widens toward the cornea, which is very 

 oblique, directed downward and inward. Second joint of the antenna 

 equaling the rostrum. The abdomen of the male is narrower than in 

 the specimen I have named A. tuhercidatus, and does not widen at the 



