428 BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



Antigua; 1918; Barbados-Antigua Expedition, Univ. Iowa: Pillars 

 of Hercules; 6 males, 7 females (4 ovigerous) (Mus. S. U. I.). Fort 

 Barclay; July 9; 1 male (Mus. S. U. I.). 



Barbados; 1918; Barbados-Antigua Expedition, Univ. Iowa; 

 Pelican Island; 2 males, 1 female (Mus. S. U. I.); tide pool. May 

 11,1 male, 2 ovigerous females (Mus. S. U. I.). Barbados; on shore, 

 and from coral head, and under sea anemones; 3 males, 11 females 

 (5 ovigerous), 1 young (Mus. S. U. I.). 



Coral reef, Colon, Panama; May 2, 1911; Meek and Hildcbrand, 

 Smithsonian Biological Survey; 1 ovigerous female (44186). 



Cartagena, Colombia; Colegio de San Pedro Apostol; 1 male 

 (53411). 



Caracas Bay, Curasao; April and May, 1920; C. J. van der Horst; 

 1 male, 3 young (56375), 2 males, 2 young (Amsterdam Mus.). 



West Point, Curasao; May 14, 1920; C. J. van der Horst; 3 young 

 (Amsterdam Mus.). 



Balata Bay, Huevos Island, Trinidad; January 29; W. O. Crosby; 

 1 young female (55699). 



Brazil; 1876-1877; Kichard Rathbun, Hartt Explorations: Fer- 

 nando Noronha; 1 male, 1 female (19948). Pernambuco; 1 male 

 (41426). Rio Formoso, Pernambuco; 1 male, 1 female (19947). 

 Mar Grande, Bahia; 2 males (19949). 



Brazil; 1899; A. W. Greeley, Branner-Agassiz Expedition: Rio 

 Goyanna stone reef; 2 males (Stanford Univ.). Pernambuco stone 

 reef, at Ilha de Nogueira; July 10; 3 males (25762). Boa Viagem 

 stone reef; 2 females (Stanford Univ.). Maceio coral reef, Alagoas; 

 July 22, 23, 26; 11 males, 4 females (25763). 



Abrolhos Islands, Brazil; December 27, 1887; Albatross; 8 males, 6 

 females (21957). 



Ilha Victoria, Sao Paulo, Brazil; 1906; Fr. Giinther; 1 male (47831), 

 received from H. von Ihering. 



MFTHRAX (MITHRACULUS) DENTICULATUS Bell 



Plate 154, figs. 2 and 3 



Mithrax denticulatus Bell, Proc. Zool. Soc. London, vol. 3, 1835 (1836) 

 p. 172 (type-locality, Galapagos Islands, under stones; type not extant) ; 

 Trans. Zool. Soc. London, vol. 2, 1836, p. 54, pi. 11, fig. 2. — Nobili, 

 Boll. Mus. Zool. Anat. Comp. R. Univ. Torino, vol. 16, 1901, No. 415, 

 p. 31. 



Mithraculus denticulatus White, List Crust. Brit. Mus., 1847, p. 7. — A. 

 Milne Edwards, Crust. Reg. Mex., 1875, p. 109, pi. 23, fig. 4. 



Dia^Aiosis. ^Carapace nearly half wider than long. Two lobes 

 and one spine on antero-latcral margin. Two lobes of basal antennal 

 segment equally advanced. Inner edge of wrist laminate. 



Description. — General shape same as in M. coryphe. Rostrum 

 similar. Tubercles immediately behind rostral horns larger than in 



