A NEW AMPHIPOD CRUSTACEAN, ORCHESTOIDEA 
BIOLLEYI, FROM COSTA RICA. 
By Tuomas R. R. Srepaine, 
Of the Royal Society, London, England. 
Before proceeding to describe a new species of Talitride: I wish to 
refer to a former paper on Amphipoda from Costa Rica, 1 which I 
figured and described as new Hyalella faxoni,* pointing out its near 
relationship to other forms earlier described under various names. 
Recently, in her very interesting paper cited below, Miss Weckel has 
made /7. faxont a synonym of the species which in her opinion ought 
to be called H. knicherbockert (Bate). The independence of /. 
jaxont is not a matter of great moment; but the question remains an 
open one whether it may not be more inconvenient than necessary to 
fuse under one name the forms of //yalella which have been dis- 
tinguished as dentata and inermis. Supposing that a single name 
is required, there are three to choose from with claims prior to Bate’s 
knickerbockert. These are the obscure Ampithoe dentata Say, 1818, 
Amphitoe aztecus Saussure, 1858, and Amphithoe andina Philippi, 
1860. The reader inclined to accept a bias in a certain direction 
may consult the notes on these names in the bibliography to the 
“Challenger Amphipoda,” 1888, as well as the references supplied 
by Das Tierreich in 1906. 
In the Amphipoda of Das Tierreich there is an inconsistency be- 
tween pages 523 and 524, the former affirming that the palp of the 
first maxilla is one-jointed in the family Talitride, the latter that it 
is two-jointed in the genus Valitrus. The alternative character of 
“minutely two-jointed ” should have been added to the description 
of the palp in the diagnosis of the family. 
Family TALITRID AN. 
1818-14. Orchestida~ Leacu, Edinburgh HPneyclopedia, VII, p. 482. 
1906. Talitrid@ STEBBING, Das Tierreich, Lief. 21, p. 528. 
1907. Grchestiide ADA WECKEL, Proe. U. 8S. Nat. Mus., XX XIII, p. 54. 
OPTOC Us SaNake MUSs SOXGVal 19035 pe 928) ple uxt 
PROCEEDINGS U.S NATIONAL Museum, VOL. XXXIV—No. 1609. 
Proc. N. M. vol xxxiv—08 16 Dat 
