148 BULLETIN 166, UNITED STATES NATIONAL MUSEUM 



SPELOEOPHORUS DIGUETI (Bonvler) 



Plate 39, Figures 4^6 



Lithadia digueti Bouvier, Bull. Soc. Ent. France, 1898, p. 330 (type locality. 

 Gulf of California; type in Paris Mus.). 



Diagnosis. — Carapace longer than broad; a well-marked constricted 

 neck. Two pairs of orifices; dorsal ones circular, surrounded by 

 five stout lobes, four branchial, one cardiac. Four prominent, 

 triangular, posterior lobes, two branchial, two intestinal. 



Description. — Carapace longer than wide, everywhere covered 

 with unequal, flattened granules, almost touching, scarcely promi- 

 nent; on the elevated parts the granules are stronger and irregular, 

 giving the surface a corroded appearance. Front truncate, hollowed 

 out at middle, and inclined strongly upward ; behind the obtuse carina 

 which limits this inclined part, there is a broad, prominent, longi- 

 tudinal swelling, which widens behind under the form of a small 

 mesogastric triangle; it is regularly concave, due to the elevation of 

 the front. Hepatic tubercles strong and almost pyramidal; they 

 form the outer limit of a deep, irregular depression which extends to 

 the branchial area and the median swelling. Branchial elevations 

 very high and irregular; their highest point is a large subpyramidal 

 prominence, which is found in the neighborhood of the cardiac area; 

 they are a little less elevated in front and present here three or four 

 irregular and slightly corroded bosses; an arcuate swelling connects 

 the outermost of these bosses with the posterior part of the hepatic 

 tubercle; below tliis swelling the carapace is very inclined and forms 

 a coarsely granulate facet which is continued behind to the postero- 

 lateral angle. This last is very prominent, broad, obtuse, and directed 

 backward and outward; it is attached to the hepatic tubercle by an 

 S-shaped lateral border. Subhepatic tubercle slightly visible in 

 dorsal view. The cardiac region forms an obtuse and very outstand- 

 ing prominence which does not conceal the two large lobes of the 

 intestinal region; it sends outward a broad prolongation which is 

 soldered to, and forms a wide bridge with, a corresponding branchial 

 area. Between the inner orifices of these two bridges the carapace is 

 strongly depressed. 



Ocular peduncles short. Antennular fossettes very obHque; orbi- 

 tal fissures completely closed. Opercular part of outer maxillipeds 

 equally granulous throughout. Chelipeds subcylindrical, covered 

 with obtuse granules; a tubercle on outer surface of merus, a row of 

 three on outer surface of palm, bordered on either side by a longi- 

 tudinal sulcus. Legs ornamented with large tubercles, obtuse or 

 spiniform, on upper border of merus, carpus and propodus; also 

 some spinules on lower border of propodus. Abdomen of male with 

 a prominent row of tubercles on median line, also a lateral row on 



