94 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



Midias lobodes Wilson 



Figures 34-36 



Midias lohodes Wilson, 1911b, p. 626, pi. 65; 1913, p. 225.— Causey, 1953b, p. 

 11.— Shiino, 1958, p. 98, figs. 1-3; 1963a, p. 343.— Yamaguti, 1963, p. 107, 

 pi. 127, fig. 1. 



Distribution and hosts. — 4 host records: 



locality hosts references 



Gulf of Mexico Sphyraena barracuda Wilson, 1911b 



Western Atlantic S. barracuda Wilson, 1913 



Hawaii S. barracuda Shiino, 1963a 



Indian Ocean Sphyraena species Shiino, 1958 



Material.— One female and 1 male (USNM 112888) from the ex- 

 ternal surface of Sphyraena barracuda (Walbaiim) captured 80 miles 

 south of Oahu, Hawaii (USFWS). Two females and 2 males (retained 

 by author) from the external surface of S. barracuda (Walbaum) 

 captured in the Hawaiian region (USFWS). 



Measurements. — (In mm) 1 female and 3 



Total length, excluding caudal setae 



Length of cephalothorax, including frontal region 



Width of cephalothorax 



Length of genital segment, excluding fifth legs 



Width of genital segment 



Length of abdomen 



Width of first segment of abdomen 



Length of fifth leg 



Length of caudal rami 



Description. — Female cephalothorax (fig. 34o) subovoid, consist- 

 ing of cephalon and first 4 thoracic segments. Frontal region approx- 

 imately one-fifteenth the length of cephalothorax, with pair of ovoid 

 lunules and bearing fine membrane along anterior edge. Lateral 

 cephalothoracic margin smoothly irregular, with fine membrane 

 extending laterally and second membrane extending medially, from 

 ventral edge. Posterior lateral surface of cephalothorax with small, 

 pocket-like depression; posterior sinus (fig. 34c) narrow, outer and 

 inner margins converging at opening, outer surface with fine membrane 

 extending into sinus and second membrane extending laterally over 

 division between lateral and median cephalothoracic regions. Median 

 cephalothoracic region not extending past posterior end of lateral 

 cephalothoracic regions, posterior margin irregular. Major dorsal 

 cephalothoracic grooves forming irregular H ; ocular region distinct in 

 anterior third of body. Dorsal surface with scattered nodules, each 

 bearing 1 or 2 hairlike processes. 



