collections); Honduras; Brazil (2 collections); 

 Tylosurus punctidutus, Sandakan, Borneo. 



Femwle. — Body form as in figure 147. Average 

 total length 2.58 mm., based on 128 ovigerous fe- 

 males from six host species. Specimens from Pa- 

 cific waters aAerage larger (4.02 mm.) than those 

 from the Atlantic (2.22 mm.). Most of our collec- 

 tions were from the Atlantic; if more material 

 were available from the Pacific the average total 

 length for all collections would be greater. The 

 total length (in millimeters) of each adult female 

 in 36 collections from six host species is presented 

 below. Note that the variation between collections 

 is greater than the variation within a collection. 



8troiigylura not*at<t. 2.19 (average). 



Sarasota, Fla 1.7, 1.8, 1.9, 1.9, 



1.95. 



Sarasota, Fla 1.96, 2.0. 



Sarasota, Fla 3.0, 3.15, 3.15, 



3.2, 3.3, 3.4. 

 Sarasota, Fla 2.8, 2.8, 3.0, 3.0, 



3.15. 



Key Biscayne, Fla 1.95, 2.0, 2.1. 



Andros Island, Bahamas 1.65, 1.7. 



Cuba 2.3, 2.4, 2.5, 2.6. 



Yucatan 1.7, 1.95, 2.5. 



Strongylura timucu 2.10 (average). 



Sanibel Island, Fla 1.5. 



Sarasota, Fla 1.7, 1.8, 1.9, 1.9, 



1.9, 1.9, 2.0. 

 Cedar Keys, Fla 1.6, 1.7, 1.7, 1.8, 



2.1. 



Key Biscayne, Fla 2.2. 



Key Biscayne, Fla 1.95, 2.1, 2.1, 2.2. 



Bahamas 2.0, 2.1, 2.2. 



Bahamas 2.0,2.3. 



Yucatan 2.1,2.25,2.4,2.4, 



2.5. 

 Yucatan 2.1, 2.2, 2.3, 2.4, 



2.7. 



Puerto Rico 1.9,2.2,2.2. 



Puerto Rico 2.2,2.2,2.25,2.3. 



Virgin Islands 1.9, 1.95, 2.2. 



Colon, Panama 2.0. 



Brazil 2.4,2.5,2.5. 



Strongyhixa marina 2.44 (average). 



Beaufort, N.C 2.1, 2.3, 2.3, 2.3, 



2.3, 2.5. 

 Beaufort, N.C 2.9, 3.1, 3.3, 3.4, 



3.4. 



386 



Beaufort, N.C 2.6, 2.7, 2.8, 2.85, 



2.9, 3.0. 

 Jekyll Island, Ga 1.9, 1.9, 2.25, 2.4, 



2.5. 



Flagler Beach, Fla 1.8, 2.0. 



Amelia River, Fla 1.65, 1.9, 1.9, 



1.95. 



Strongykira incisa 3.93 (average). 



Marshall Islands 4.0,4.2,4.2, 4.4, 



4.5. 



Gilbert Islands 4.2. 



Philippines 3.15. 



Amhem Land, Australia 2.8. 



Strongylura exilis 4.08 (average). 



San Diego, Calif 2.5,2.7. 



San Diego, Calif 3.6,3.7,3.75,3.9, 



4.5. 

 San Diego, Calif 4.4,4.5,4.7,4.9, 



4.9, 4.95. 



Strongylura scwpularis 3.20 (average). 



Balboa, Canal Zone 3.2, 3.2. 



The mean total length clearly varies with the 

 host or geographic area or both. Atlantic L. 

 helones are generally shorter than those from the 

 Pacific. The lengths are not always consistent 

 within a geographic area, however. For example, 

 the lengths of the copepods from four collections 

 from S. notata from Sarasota, Fla., vary consider- 

 ably from collection to collection ; each collection 

 was made in July-August but in different years 

 (1965-68). Another example is the three collec- 

 tions from S. exilis from San Diego, Calif. 



Cephalon about one-third total body length. 

 Posterior corners without horns (fig. 147). No 

 further description of the female is given here 

 as the appendages are identical io those described 

 for L. comutus (=L. tylosuri) by Shiino (1965). 

 Shiino stated that the armature of the second pair 

 of legs differs in the two species but we could not 

 find this difference in the collections of both spe- 

 cies reported herein. 



Male. — Body form as in figure 148 and plate 3. 

 Total length of six specimens averages 1.53 mm. 

 (1.10-2.18 mm.). Specimens from Pacific areas 

 are larger (1.42, 1.42, 1.80, and 2.18 mm.) than 

 those from the Atlantic (1.10 and 1.27 mm.). 

 Cephalon slightly wider than long and composing 

 about one-quarter total body length. 



Second antenna (fig. 149) a simple claw, sur- 

 face of segments covered with small pits. Mandible 



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