HAWAIIAN ACANTHURID CALIGOIDS — LEWIS 



171 



in the inunature female, is incompletely developed. (For explanation 

 of symbols, see figure 1.) 



Caudal ramus of male and immature female forms about three- 

 fourths length of second abdominal segment of male, length greater 

 than width. Caudal ramus with six-plumose setae, one from median 

 ventral lateral surface, second from lateral margin just posterior and 

 lateral to base of first, three long setae from median posterior margin, 

 and one small seta from inner posterior corner. 



Remarks. — Caligus ligatus resembles C. praetextus Bere, 1936, in 

 general body shape and the second antenna but differs from this 

 species in the shape of the fourth thoracic leg-bearing segment and 

 the genital segment and in the appendages other than the second 

 antenna. The constricted shape of the region of fusion of the fourth 

 thoracic leg-bearing segment and the genital segment is also found in 

 C. constrictus Heller although the appendages of this species and those 

 of C. ligatus are quite different; C. constrictus possesses, for example, 

 a four-segmented fourth thoracic leg but that of C. ligatus is only 

 three-segmented. The arrangement of the fourth thoracic leg spines 

 is found in several species of Caligus (C. longicervicis Gnanamuthu, 

 1949; C. sphyraenae Nunes-Ruivo and Fourmanoir, 1956; C. quadratus 

 Shiino, 1954), but the combination of characteristics presented by 

 C. ligatus is unique. 



The name "ligatus" is used in reference to the constrictions of the 

 posterior portion of the fourth thoracic leg-bearing segment. 



Caligus kalumai, new species 



Figures lOa-q 



Material. — Adult, nonovigerous female (holotype, USNM 105109) 

 collected by author from side of specimen of Acanthurus guttatus 

 Bloch and Schneider taken by poison near Nanakuli, Oahu, Hawaii, 

 by Dr. William Gosline and^others. 



