This is the first in a series of reports on the parasitic copepods from the Gulf of Mexico and the Caribbean Sea. Klaus Ruetzler (Smithsonian Institution), director of the Investigations of Marine Shallow Water Ecosystems project at Carrie. Second antenna (Fig. 5), last segment with ill-defined rows of hook-like spinules (rows visible more distally), row of longer spinules near the center of the inner margin, a subterminal inner process with a row of similar long spinules, 4 recurved ends to inner hook-like spines, and 2 outer naked hairs.
Maxiliped (Figure 17) with recurved claw; first segment with inner seta; second segment with two inner setae and prominence of stout spines on inner margin; last segment with inner basal seta, modified as claw, inner edge with row of spines. Second antenna (Figure 27) first segment with 1 distal seta, inner part of the second segment with hook-like spines not arranged in separate rows, lateral palp with row of prominent spines along the inner edge, second segment with 1 subterminal hook, 3 terminal jointed hooks, and 3 naked hairs. Mouthparts (Figure 28) of the usual type, labrum with a small patch of spines on the distal corners, first maxilla with 3 prominent setae, each with a lateral row of spines and 1 short naked setae.
2 except exopod last segment lacking first short outer spine, endopod last segment with only 2 setae. REMARKS.—This species can be distinguished from all known Holobomolochus by the lack of ornamentation on the ventral surface of the last abdominal segment and caudal rami. The unusual character of leg 5 with only a short row of 10-12 spinules on the inner margin and the four almost equal setae make this species easy to recognize.
Second antenna ( Figure 39 ) last segment with fine hook-shaped spinules not in distinct rows, palpus with a row of longer hook-shaped spinules along margin, 3 setae and 4 terminal and subterminal articulated spinules.
Together, these four species of Holobomolochus form a group characterized by long, highly sclerotized spines on the exopod of leg 3 and so far known only from the western Atlantic and eastern Pacific. The three previously described species of this group are parasitic on the nasal sinuses of New World species of Scomberomorus. Additional material ($12) collected from 81 specimens of the same host and locality at various times by the author between 1972 and 1975.
ETYMOLOGY.-The Latin serratus (toothed like a saw) alludes to the ornamentation of the spine on the exopod of leg 2. The new species can be distinguished from both of these species by the arrangement of the spinules in separate rows on the second antenna. of each of these previously known species. From the remaining genera with one larger seta, the new species can be distinguished by lacking an inner seta on the mid-endopodal segment of leg 4;. all others with a 3-segmented endopod of leg 4 bear a single seta on the middle segment.
Neither author mentions any modified setae on the first antenna, which should be easily seen if present (I examined the holotype of P. uniseriatus and saw no modified setae). The modified setae on the first antenna of Neobomolochus are similar to those found in Nothobomolochus, but the new genus differs from Nothobomolochus by the presence of two inner setae on the middle endopod segment of leg 3 and one seta on the same segment of leg 4 of Nothbom- olochus. Manuscripts intended for serial publication receive substantive review within their original Smithsonian museums or offices and are submitted to the Smithsonian Institution Press with approval of the appropriate museum authority on Form SI-36.
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