38 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



//. Basal article of peduncle of first antenna armed with numerous spines. Sec- 

 ondary appendage of first antenna about one-half as long as flagellum. No 

 spines at side of head at place of fusion of first segment of thorax with the 

 head. Ocular spines small. Last segment of abdomen with the posterior 

 margin triangularly produced. 



c. Basal article of peduncle of first antenna armed with four spines on the inner 

 lateral margin. Rostrum in form like a spear point, on either side of which 

 is a small acute process within the ocular alee. Last thoracic segment 

 with a ventral spine. Lateral margins of five anterior segments of abdo- 

 men not produced in acute processes Apseudes triangulatm Richardson 



(/. Basal article of peduncle of first antenna armed with three spines on the 

 inner lateral margin. Rostrum produced in a long, acute deflected process, 

 on either side of which the lateral margin is expanded and evenly curved. 

 All six segments of thorax armed with ventral spines. Lateral margins of 

 five anterior segments of abdomen produced in acute processes. 



Apseudes propinquus Richardson 



APSEUDES'ESPINOSUS Moore. 



Apseudes espinosus MOORE, Bull. U. S. Fish Commission, XX, Pt. 2, 1902, pp. 

 164-165, pi. vii, figs. 1-6. 



Locality. Porto Rico, off St. Thomas. 



Depth. 20 fathoms, in coral bottom. 



" Cephalothorax short, less than length of first three segments of 

 thorax, slightly wider than long; rostrum short, produced to a mere 

 point; eyestalks short, projecting but slightly beyond sides of head. 

 First three segments of thorax subequal to one another in length 

 and breadth, approximately equal to head in breadth. Last three seg- 

 ments narrower; fourth segment longer than segments two and three 

 combined; fifth free segment about equal to them; sixth segment about 

 three-fourths as long as fifth. Epimera of first three segments not 

 evident, none of the segments with lateral spines; epimera of last 

 three segments small, in dorsal view projecting slightly from beneath 

 each segment near its articulation with its successor. Abdomen nar- 

 rower than last segment of thorax, but not abruptly so; the first five 

 segments equal in length and successively slightly narrower; collec- 

 tively about as long as sixth thoracic segment; lateral margins rounded, 

 somewhat produced posteriorly. Telson about as broad as long, slightly 

 narrower than fifth segment of pleon, bilobate posteriorly. 



"Peduncle of antennule as long as head, first joint stout, longer than 

 other three joints combined, second joint not half as long as first, two 

 following joints successively shorter; two flagella of equal length, and 

 longer than peduncle, the outer somewhat shorter, with seventeen 

 joints, inner flagellum with fifteen joints. 



"Antennae about two-thirds as long as antennules; peduncle short, 

 consisting of five joints, first and second joints stout, second furnished 

 with a scale beset with long setae, last three joints short. Flagellum 

 about as long as flagella of antennule, consisting of thirteen setiferous 

 joints. 



