190 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



the species of Betoeus described by Dana {truTwatus, cequimanus, scabro- 

 digitus), Stimpsou {australis and trispinosus), and Lockington (longidaoty- 

 lus and equimanus) will have to be placed in the genus Alpheus. 



Say, in volume 1 of the Journal of the Academy of Natural Sciences, 

 ■was the first to mention any North American species of this genus, 

 describing Alpheus Jieterochelis and A. minus. Milne-Edwards, in his 

 "Histoire Naturelle des Orustaces", t. ii, describes as new A, armillatus 

 from the West Indies, and also gives abstracts of Say's descriptions. 

 DeKay, in the "New York Fauna, Crustacea", also gives brief diagnoses 

 of the same two species. Gibbes, in the " Proceedings of the American 

 Association for the Advancement of Sciences", vol. iii, reports A. hetero- 

 clielis and A. minus fromFloridsi aud Charleston, S.O. He also proposes as 

 new A. formosus. Henri de Saussure, in his "M6moire sur Divers Crus- 

 taces Nouveaux du Mexique et des Antilles", redescribes A. heterochelis 

 under the specific name lutarius. He also refers to a previous article 

 (Revue Zoologique, 1857, 99, 100), where, laboring under a misapprehen- 

 sion, he described it as the type of a new genus, Malopsyche. Dr. Stimp- 

 son, in a critique of this memoir of Saussure (American Journal of Sci- 

 ence, 1859, xxvii. 446), pronounces his lutarius to be the heterochelis of 

 Say. S. I. Smith ("Transactions of the Connecticut Academy of Arts 

 and Sciences", ii. 39) reports A. heterochelis from various localities. Dr. 

 Streets, in the " Proceedings of the Academy of Natural Sciences of Phil- 

 adelphia", 1871, 242, describes J-. bispinosus fvom. the Isthmus of Panama, 

 but from which coast I am unable to ascertain. Mr. Lockington, in the 

 " Proceedings of the California Academy of Sciences", February 7, 1876, 

 describes Alpheus helUmanus., A. equidactylus, and Betceus longidactylus, 

 this being the first mention of any species from the Pacific coast. In a 

 later paper (March 20, 1876), he adds Betceus equimanus and Alpheus 

 clamator. This comprises, so far as I am aware, all the literature of the 

 North American Alphei. 



-Alpheus minus Say. 



Alpheus minus Say, Jour. Acad. Nat. Sci. 1818, i. 245. — Edwards, Hist. Nat. deB 

 Crustacea, ii. .356. — DeKay, New York Fauna, Crustaeea, 26. — Gibbes, Proc. 

 Am. Assoc. Adv. Sci. 1851, 196, 



Alpheus formosus Gibbes ?, loo. cit. 196. 



Carapax smooth ; rostrum short, acute ; a spine arising from the an- 

 terior edge of the hood over each eye equalling the rostrum in length, 

 thus giving the front a three-spined appearance. Basal spine of anten- 

 nulse slender, acute, incurved, reaching to the middle of the second 

 basal joint; first joint as long as second and third, second a half longer 

 than the third ; flagella ciliated, two-thirds the length of the carapax. 

 Basal spine of antenna3 long, slender. Antennal scale regularly ellip- 

 tical, extending slightly beyond the antennular peduncle; flagellum 

 nearly twice as long as the carapax. External maxillipeds slender, ex- 

 tending beyond the peduncle of the antennulse. Feet of the first pair 

 greatly unequal ; larger hand a third longer then carapax, cylindrical. 



