PILUMNHXE 51 



The following key to the species of this genus is taken from Miss 

 Rathbun Am. Nat. xxxiv, 136. 



Key to species. 



a. Hands smooth, without lobes or teeth on upper margin. L. bellus 



aa. Hands with one or more lobes or teeth on upper margin. 



b. Carpus of chelipeds smooth or nearly so. L. heathii 



bb. Carpus of chelipeds very rough. 



c. Carpus of chelipeds covered with reticulating ridges enclosing 



pits of irregular shape. L. leucomanus 



cc. Carpus of chelipeds covered with tubercles. L. diegensis 



Lophopanopeus bellus (Stimpson). 

 Plate XII, fig. 37- 



Xantho bclla Stimpson, Ann. Lye. Nat. His. N. Y., vii, 204, pi. v, fig. 2, 1860. 

 Lophoxanthops bellus Holmes, Occas. Papers Calif. Acad. Sci., vii, 60, 1900, and 



synonymy. 

 Lophopanopeus bellus Rathbun, H. A. E., x, 180, 1904, and synonymy. 



Lophopanopeus bellus is recorded from Monterey Bay, but it is with 

 some hesitation that I place here some of the specimens which I have 

 examined. In size, proportions of carapace and ornamentation of hand 

 they correspond very closely with Miss Rathbun's description, but the 

 carpus is exactly that given for L. lockingtoni; the granulated ridge at 

 the distal margin and the sulcus behind this being the most obvious differ- 

 ence between these specimens and the more numerous L. heathii. 



The color in life of this, as of Lophopanopeus heathii, is very vari- 

 able, more so than any other crab found in the bay. Some specimens are 

 almost pure white, while others show various irregular patterns of bluish 

 and dark red or are wholly of the latter color. 



Lophopanopeus heathii (Rathbun). 



Plate XII, fig. 38. 

 Lophopanopeus heathii Rathbun, H. A. E., x, 182, 1904, and synonymy. 



This is by far the most common species of this genus in Monterey 

 Bay, and is represented in the collection by numerous specimens, all of 

 which agree in having a smooth carpus. The color as before stated is 

 very variable. 



