246 BULLETIN 166, UNITED STATES NATIONAL MUSEUM 



HEPATUS LINEATUS Ralhbun 



Figure 44; Plate 74, Figures 1, 2; Plate 75, Figures 1, 2 



fHepatus sp. Kinahan, Journ. Roy. Soc. Dublin, vol. 1, pp. 333, 345, 1857 (1858) 



(Chincha Islands, Peru). 

 Hepatus lineatus Rathbun, Proc. U. S. Nat. Mus., vol. 21, p. 610, pi. 44, fig. 4, 



1898 (type locality, off Abreojos Point, Lower California; type, U. S. N. M. 



no. 21597). 



Diagnosis. — Carapace narrow and high; suborbital cavities not 

 visible from above; front advanced, thick, truncate; first to sixth seg- 

 ments of male abdomen tuberculate. A longitudinal stridulating 

 ridge on inner face of movable finger. 



Description. — Carapace strongly arched, height about one-third 

 width. Front well advanced beyond outer orbital angles and having 



Figure 44. — Hepatus lineatus, male (21597): Dorsal view. 



a broad median furrow with a dorsal swelling on either side. The 

 clusters of tubercles on the dorsum consist of a single large tubercle 

 surrounded by a number of small ones; in front of the anterior bran- 

 chial cluster there is a line of 11 to 14 tubercles extending obhquely 

 backward and outward. The tridenticulate teeth of the anterolateral 

 margin increase gradually in size beginning at the orbit. Postero- 

 lateral margin very concave, anteriorly thickened and bearing a promi- 

 nent tooth near either end. Abdomen narrow, tuberculate except 

 terminal segment; sternum closely tuberculate. Tubercles of manus 

 very large and close, superior teeth four, triangular. Dactyli of legs 

 pilose. 



Color. — Red Unes encircle round or oblong areas which touch one 

 another, or the lines border narrow strips forming transversely arcu- 

 ate bands across carapace except behind, where the patches are more 

 irregular. 



Measurements. — Male cotype, length of carapace 17.6, width 22 mm. 



Habitat. — The carapaces of quite a number of these crabs were 

 found at the lowest tide levels in the sandy portions of the beach at 

 San Felipe. Living crabs are usually decorated with one or a number 

 of solid, purple and white striped anemones of the family Sagartiidae, 



