HAWAIIAN ACANTHURID CALIGOIDS — LEWIS 203 



Genus Dentigryps Wilson 



Diagnosis. — Fourth thoracic leg-bearing segment and genital seg- 

 ment fused in female, covered by single, dorsal plate. Lunules absent, 

 sternal furca present; fifth legs of female elongate, conical, spinelike 

 processes protruding from genital segment. 



Remarks.— The genus was established by Wilson (1913) on the 

 characteristics presented by the female of D. Curtus Wilson, 1913, the 

 type-species of the genus. With the description of the new species 

 below, the second species known for the genus, the diagnosis has been 

 modified slightly. 



Dentigryps bifurcatiis, new species 



Figures 17 a-c,e-k,m-q, 18a-c,€,f 



Material. — Nonovigerous adult female (holotype, USNM 105094) 

 taken by author from side of specimen of Acanthurus olivaceous Bloch 

 and Schneider given to author by Mr. Spencer Tinker from collections 

 of Honolulu Aquarium. Mature male (allotype, USNM 105095) col- 

 lected by author from caudal fin of specimen of Naso hexacanthus 

 (Bleeker) captured in fish trap between Diamond Head and Koko 

 Head, Oahu, Hawaii, by Samuel Kaolulo. Mature female (paratype, 

 USNM 105096) collected by Dr. John Randall from epidermis of 

 specimen of Acanthurus triostegus sandvicensis Streets captured in 

 unknown locality on Oahu, Hawaii. 



Measurements.- — Holotype female: Length from anterior end to 

 posterior end of caudal rami, excluding setae, 3.50 mm. Greatest 

 length of cephalothorax, including frontal region, 2.44 mm,; greatest 

 width, excluding marginal flanges, 2.30 mm. Greatest length of fused 

 fourth thoracic leg-bearing segment and genital segment 0.70 mm.; 

 greatest width of genital segment 1.19 mm.; length of left genital seg- 

 ment spine 0.78 mm. Tip of right spine broken. 



Allotype male: Length from anterior end to posterior end of caudal 

 rami, excluding setae, 1.97 mm. Greatest length of cephalothorax, 

 including frontal region, 1.48 mm.; greatest width, excluding marginal 

 flanges, 1.48 mm. Greatest length of fourth thoracic leg-bearing 

 segment and genital segment, excluding sixth leg projections, 0.50 mm. 

 (measurement taken on ventral surface); greatest width of genital 

 segment 0.39 mm. Length of projecting fifth legs, excluding setae, 

 0.18 mm. 



Paratype female: Length from anterior end to posterior end of 

 caudal rami, excluding setae, 2.85 mm. Greatest length of cephalo- 

 thorax, including frontal region, 2.07 mm.; greatest width, excluding 

 marginal flanges, 1.93 mm. Greatest length of fused fourth thoracic 



