70 PROCEEDINGS OF THE CALIFORNIA 



The whole of the upper and under surface, except the inner side of the 

 hand and upper surface of the rostrum, tomentose, with longer hairs at inter- 

 vals, and a row of the latter on each side of the rostrum. 



Locality, Gulf of California. 



d £ 



M. M. M. M. 



Length of carapax 20 23 



Greatest width of carapax 12 15 



Out of the three specimens in my possession the female is the largest, but 

 has the rostrum shorter than the males. 



19. Othonia picteti. De Saussure, Revue et Magasin de Zo dogie, V, 357, 

 pi. XIII. f. 2. 



mitei;aciD/e. 



2D. Mithrax armatus r i De Saussure, Revue et Magasin de Zoologie, V, 335, 

 pi. XIII, f. 1. 



Either this species or the succeeding is most probably the M. armatus of 

 De Saussure, but for the reasons given more fully under the next species, I 

 cannot be certain of its identity, and therefore subjoin a description. 



Rostrum bifid, the horns not lamellate; carapax broadly pyriforni; verrucose 

 throughout its upper surface, the verrucas becoming spinose on the poster- 

 ior portion of the carapace. .Exterior side of the fixed joint of outer an- 

 tenna? with a long spine at the extremitj 7 , followed by a shorter. A short pre- 

 orbital spine, separated by a deep notch from the post-orbital. Margin of 

 carapace with five large spines besides the post-orbital, four upon the antero- 

 lateral, the fifth upon the postero-lateral margin. A second row of smaller 

 spines upon the sub-branchial region. First pair of limbs short; dactyli not 

 tapering, obtuse and imperfectly spoon-shaped at end; propodus oblong, 

 more than twice as long as wide, smooth; carpus and nierus spinose above, 

 but without the smaller tubercles found on the carapax. Four hinder pairs 

 slender, cylindrical; rnerus and carpus spinose above like those of first pair; 

 propodus slightly hirsute, smooth; terminal joint (dactylus, tarsus) hirsute, 

 ending in a recurved claw of an orange color. Abdomen six-jointed in the 

 female. The whole of the upper surface of carapax and limbs, between the 

 spines and tubercles, is finely punctate; and the whole of the lower surfaces 

 tomentose. 



A single female from Mazatlan, presented by Hy. Edwards, is the only 

 specimen I have seen of the species. 



M. M. 



Length of carapax to tip of rostrum 32 



Width of carapax from tip to tip of fourth marginal spine 30 



Length of first pair 2S 



L ngth of second pair 32 



Color of the specimen a light flesh tint. 



No. 3. Female, dry. Mazatlan. Hy. Edwards. 



