rami (fig. 84) with patches of broad spinules. 

 Maxilliped (fig. 85) second segment with a large 

 patch of spinules. Leg 1 (fig. 86) with patches of 

 broad spinules on interpodal plate and basipod, 

 otherwise armed as in P. hellones. Other append- 

 ages as in P. hcJlones. 



Etym-ol^gy. — The specific name ensiculus, Latin 

 for "sword," refers to the terminal spines on 

 the female 5th leg. 



Reviarks. — P. ensicidu.s can be separated from 

 all other members of the genus by the spines on 

 leg 5. This species is apparently restricted to the 

 eastern Pacific Ocean and so far has been collected 

 only from Strongylura exilis a,nd S. scapularis, 

 both hosts endemic to that area. 



Tlie male of this species can be separated from 

 P. iell-ones only by the more prominent spinules 

 on the interpodal plates, maxilliped, and basipod 

 of leg 1 of P. ensiculus. 



Parabomolochus constrictus Cressey, New Species 

 Figures 87 to 90 



Specimens studied. — A total of 178 individuals 

 from 32 collections from the gill chambers of 6 

 species of eastern Pacific needlefishes: Ahlennes 

 hian.'i, Acapulco, Mexico; Panama Bay, Panama 

 (2 collections) ; Ecuador; Cabo Blanco, Peru 

 (2 collections) ; Platyhelone argalus, Bahia Santa 

 Maria, Baja California; Secas Island, Panama; 

 Perlas Islands, Panama; Gulf of Panama; Gala- 

 pagos Islands; Gulf of Guayaquil, Ecuador; 

 Stj'ongyJura scapularis, Gulf of Nicoya, Costa 

 Rica; Panama Canal Zone (3 collections) ; 

 Strai^gylura exilis. Baja California (5 collec- 

 tions) ; Gulf of California; northern Peru; Tylo- 

 sunis acus, Costa Rica (2 collections) ; Panama (2 

 collections); Colombia; Cabo Blanco, Peru; Ty- 

 losunis crocodilus, Tangola, Mexico; Cocos Is- 

 lands; Panama (2 collections). 



Holotype female (ITSNM 125694) and 43 para- 

 type females (USNM 125695) from 13 specimens 

 of Platyhelone argalus ptenira- from the Gulf of 

 Guayaquil, Ecuador. 



Fern-ale. — Body form as in P. ensicuhis. Total 

 lengths and greatest widths of three specimens: 

 1,050 ij. by 600 ^, 1,050 f, by 600 ^, 980 /x by 560 ^. 

 Patches of fine spinules present on ventral surface 

 of last abdominal segment and caudal rami (fig. 

 87). Caudal rami pro{X)rtionally larger than in P. 

 ensiculm and P. iellones; lengths and widths of 



the rami of three specimens are 152 fi by 74 n, 143 n 

 by 73 jit, and 138 ^ by 80 ix. 



Cephalic appendages as in P. ensiculus with 

 following exceptions: paragnath bladelike with 

 fringe along posterior border and encircling tip ; 

 second maxilla (fig. 89) largest terminal spine 

 with large patch of spinules, smaller spine with 

 prominent spines on both edges; maxilliped (fig. 

 88) with small, blunt lateral tooth on outer border 

 as compared to prominent pointed tooth present in 

 both P. iellones and P. ensicul'us. Surface of 

 labrum with two patches of fine spinules. 



Legs 1 to 4 as in P. ensieiilus. Leg 5 (fig. 90) 

 outer two spines on terminal segment pinched neai- 

 tip ; inner spine pinched near midpoint, distal half 

 narrowed. Patches of spinules near bases of spines 

 with finer spinules than those of P. ensiculus. Leg 

 6 absent. 



Egg sacs as in P. ensiculus. 



Color in preserved specimens, cream. 



^lal-e. — Unknown. 



Etymology. — The specific name constrictus is 

 Latin for "drawn together" and refers to the na- 

 ture of the spines on the 5th leg of the female. 



Rejmirhs. — This si>ecias can be separated from 

 all other known members of the genus by the 

 nature of the 5th leg spines. It is described here 

 from five siiecies of needlefishes and is apparently 

 endemic to the eastern Pacific Ocean. 



Subsequent to this study, Cressey examined 

 parasitic copepods collected by Edmund Hobson 

 at La Jolla, Calif., from 30 species of inshore 

 fishes. Parabainolochus constrictus was collected 

 from one collection of each of the following hosts: 

 Atherinidae, Atherinops afftnis (Ayres) ; and 

 Embiotocidae, Micromefrus nviniimi-s (Gibbons), 

 Phmvcrodon atripes (Jordan and Gilbert), and 

 Rhacochilus vacca (Girard). These additional 

 hosts point out the "loose" host specificity in this 

 species, and it is likely that bomolochids as a group 

 are less host specific than most other parasitic 

 copepods. In each of the California collections, 

 only one copepod was collected from each 

 individual. 



Parabomolochus sinensis Cressey, New Species 



Figures 91 to 98 



Specimens studied. — Six collections containing 

 12 females and 1 male from the oral valves of 

 Strongylura strongylura and a single collection 

 containing 2 females from the upper oral valve of 



370 



U.S. FISH AND WILDLIFE SERVICE 



