HAWAIIAN ACANTHURID CALIGOIDS — LEWIS 149 



from both of the above hi the shape and size of the fourth thoracic 

 leg-bearing segment, of the genital segment, and of the abdomen, 

 which is much shorter than that of either C. kuroshio or C. bonito. In 

 addition, the cephalic appendages of C. kala differ slightly from the 

 above two species in characteristics such as the single, instead of bifid, 

 terminal process of the second antenna. 



"Kala" is the Hawahan name for fishes of the genus Naso, one of 

 which, N. hexacanthus, is the host from which the holotype specimen 

 was taken. 



Caligiis flexispina, new species 



Figures 4a-o, 5a-/ 



Material.— Adult female (holotype, USNM 105103), without 

 egg strings, taken by author from caudal fin of specimen of Acanthurus 

 triostegus sandmcensis Streets speared by author in Hanauma Bay, 

 Oahu, Hawaii. Adult male (allotype, USNM 105104), taken by 

 author from dorsal fin of specimen of A. t. sandvicensis Streets speared 

 by Robert and Donald Morris near Waikiki, Oahu, Hawaii. 



Measurements. — Holotype: Length from anterior end of body 

 to posterior end of caudal rami, excluding setae, 2.21 mm.; greatest 

 length of cephalothorax, including frontal region, 1.39 mm.; greatest 

 width, excluding marginal flange, 0.90 mm. Greatest length of 

 genital segment 0.62 mm.; greatest width 0.70 mm. 



Allotype: Length from anterior end of body to posterior end of 

 caudal rami, excluding setae, 2.30 mm. Greatest length of cephalo- 

 thorax, including frontal region, 1.56 mm.; greatest width, excluding 

 marginal flange, 1.23 mm. Greatest length of genital segment, 

 excluding projections and setae, 0.39 mm.; greatest width 0.37 mm. 



Description. — Female yellowish brown in alcohol, with no dis- 

 tinctive pigmentation marks; eyes reddish tan. Male whitish tan in 

 alcohol, with large j^ellowish splotches over entire body; eyes red. 



Female cephalothorax ovoid, widest posteriorly; frontal region 

 large, lunules large (fig. 4:d). Anterior margin of frontal region with 

 narrow, membranous flange; division between frontal region and ceph- 

 alothorax distinct, a trilobed groove, median lobe larger than lateral 

 lobes. Lateral margins of cephalothorax with broad marginal flange. 

 Posterior sinuses distinct, U-shaped, entrances open; sinuses without 

 membranous flange. Middle of cephalothorax extending well behind 

 posterior margins of lateral areas; posterior margin slightly convex, 

 with small concavity in middle of margin, at junction with fourth 

 thoracic leg-bearing segment. Cephalothoracic grooves distinct, 

 major grooves forming irregular H. Cross groove placed slightly 

 anterior of middle of cephalothorax, continuous with posterior longi- 

 tudinal grooves. Cross groove curving anteriorly from junction with 



