PROC. BIOL. SOC. WASH. 97(1), 1984, pp. 221-225 BOMOLOCHUS PAUCUS, A NEW SPECIES OF COPEPOD PARASITIC ON SCIAENID FISHES FROM SOUTHERN CALIFORNIA Roger F. Cressey and Masahiro Dojiri Abstract.— A new species of bomolochid copepod, Bomolochus paucus, from California sciaenid fishes differs from all other Bomolochus species by the com-bination of bearing 5 setae on the last exopod segment of leg 4, spinules on the ventral surface of the last abdominal segment only, and the endopod of leg 4 only slightly longer than the exopod. As part of a general survey of copepods parasitic on fishes occurring at the Orange County sewer outfall, California, one of us (MD) examined 237 white croaker Genyonemus lineatus (Ayres) and 97 queenfish Seriphus politus Ayres. A new species of parasitic copepod (Bomolochidae) was collected from these sciaenid fishes, and is described below. A low incidence and intensity of infestation is indicated as only 1 queenfish and 8 white croakers were infested. Type specimens have been deposited in the National Museum of Natural His-tory, Smithsonian Institution, Washington, D.C. Bomolochus paucus, new species Figs. 1-21 Material examined. — From the white croaker Genyonemus lineatus (Ayres): Holotype female (USNM 210491) from station TO (33°37'N, 1 17°59'W), 7 Apr 1976. Four paratype females (USNM 210492) from station TO and T3 (33°34'N, 117°58'W), 7 Apr 1976. Additional specimens consisting of 1 female cephalo-thorax and 1 immature female from station TO; 1 immature male from station T3; and 1 nonovigerous female from the queenfish, Seriphus politus Ayres from station TO. Description. — Female: Body form as in Fig. 1. Total length 1.11 mm (0.99-1.21 mm), greatest width 0.59 mm, (0.55-0.64 mm). Cephalothorax wider than long (479 x 6 1 1 Aim) comprising about 40% of total body length. Thoracic seg-ments bearing legs 2-5 free, first 2 segments nearly equal in width (anteriormost slightly wider). Genital segment (Fig. 2) wider than long (124 x 175 Aim), 3 setae of leg 6 short, not extending to margins of segment (see Figs. 2-3). Abdomen 3 — segmented, (Fig. 2) segments measure 55 x 115 /im, 41 x 104 Aim, 53 x 94 Aim (1 x w) respectively. Ventral surface of abdomen and caudal rami with spinules (see Fig. 4). Caudal rami longer than wide (55 x 26 A*m) bearing 2 major setae and 4 minor setae, both major setae with spinules along inner margin, longest seta 432 nm long. First antenna (Fig. 5) 5-segmented ventrally (second segment appears 3-seg-
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