CARCINOLOGICAL STUDIES. 49 



22. Metopograpsus mess or Forskal , 

 var. g r a cilip e s de Man. 



(PI. 4, fig. 14). 



Metopograpsus messor , Forskal; de Man, in: Journal Linnean 

 Society of London, Vol. XXII, 1888, p. 144, PI. IX, fig. 11. 



One young male from the Pacific Ocean was purchased 

 from the Museum Godefïroy. This specimen agrees with 

 the typical representatives of this species from the Red 

 Sea, but the propodites of the ambulatory legs 

 are a little more slender. I cannot decide whether 

 this difference is individual or characteristic of those repre- 

 sentatives of Metop. messor , which inhabit the Pacific 

 Ocean, because I have only one single specimen before 

 me. But when this slight difference might indeed prove 

 to be proper to the specimens of the Pacific Ocean, then 

 1 propose to designate this form as a variety under the 

 name of gracilipes. The front is also a little narrower than 

 in the type. 



Dimensions : cT 



Distance between the external orbital angles . 20 mm. 



Length of the cephalothorax 15 » 



Breadth of the front 122/^ » 



23. G r a p s u s maculatus Catesby. 



Grapsus maculatus, Catesby; H. Milne Edwards, 1. c. p. 167, 

 PI. VI, fig. 1. 



This species is at present regarded to be one of the 

 most widely distributed forms aud to occur both in the 

 Atlantic and in the Indopacific Regions. I must, however, 

 remark that a young sterile female specimen from Djed- 

 dah , Red Sea , differs from female specimens of equal size 

 from the West-Indies , which I have before me , by the 

 postfrontal lobes, especially the internal ones, project- 

 ing somewhat less forward. The cephalothorax of 

 this Djeddah specimen has a length of 33 mm. 



Notes from the Leyden Museum, Vol. XIII. 



4 



