SHRIMPS OF THE GENUS BETAEUS — ^HART 447 



Range. — El Estero de la Punta Banda, Ensenada, Baja California, 

 Mexico, to False Bay, San Diego, Calif. 



Habitat. — MacGinitie (1937), MacGinitie and MacGinitie (1949), 

 and Glassell (1938) record the shrimps living in pairs in the burrows 

 of the ghost shrimp Callianassa californiensis Dana at Ensenada 

 and in the burrows of the mud shrimp Uiiogehia pugettensis (Dana) 

 at San Diego, 



Material. — The following specimens were examined: 



Mexico. — El Estero de la Punta Bauda, Ensenada, Baja California, Dec. 19, 

 1930, G. E. MacGinitie, 1 ovigerous female, 1 male. — El Estero de la Punta 

 Banda, Ensenada, Baja California, Jan. 21, 1932, G. E. MacGinitie, 7 females 

 (1 ovigerous), 3 males. 



California. — Mission Bay, in burrow, December 1949, T. E. Bowman, 1 speci- 

 men (USNM 102442).— False Bay, San Diego, with Upogebia, Nov. 18, 1937, 

 G. E. MacGinitie, 3 females (1 ovigerous). 



Notes.- — A small, slight shrimp of the same type as Betaeus 

 harrimani and B. longidadylus, but easily distinguished from these by 

 the shape of the antennal scale, the truncate tip of the fixed finger, 

 the large teeth on the dactylus of the chela, tlie presence of a movable 

 spine on the ischium of the third and fourth walkuig legs, and the 

 characteristics of the uropod. Ovigerous females have been taken in 

 November, December, and January. 



Betaeus harfordi (Kingsley) 



Figures 46, 47, 54, 58-61, 73, 74 



Betaeus eqidmanus Lockington, 1877b, p. 43 (type locality, Cataliua Island, 



California; types not extant). 

 Alpheiis harfordi Kingsley, 1878a, pp. 198-199 (type localities, Santa Barbara and 



Catalina Island, California; types not located); 1878b, pp. 58-59; 1882, 



p. 124, pi. 2, fig. 4. 

 Alpheus aequalis Kingsley, 1878a, p. 199. 

 Betaeus aequalis Lockington, 1878, pp. 479-480. 



Alpheus (Betaeus) aequalis Holmes, 1900, p. 189, pi. 3, fig. 47 (part). 

 Betaeus harfordi Rathbun, 1904, p. 108. — Schmitt, 1921, p. 79, fig. 55. — MacGinitie 



and MacGinitie, 1949, p. 279 (part). — Ricketts and Calvin, 1952, pp. 323-324 



(part) . 



Female. — Carapace laterally compressed but without carina; 

 smooth, naked. Front (fig. 46) shallowly emarginate, produced to 

 cover eyes. Anterior margin of carapace (fig. 47) shallowly cmwed, 

 meeting lateral margin at blunt angle just ventral to base of antenna. 

 Width of carapace increasing to base of third maxillipeds, gradually 

 decreasing to curved posterolateral margin. Posterior margin pro- 

 trudes slightly before decreasing ventral to cardiac notch. 



Abdomen smooth, evenly rounded. Naked except for plumose 

 setae on ventral margin of pleura of first segment. Pleura with 



693-433—63 2 



