HAWAUAN ACANTHURID CALIGOIDS — LEWIS 187 



Aberrant immature male specimen shown in figure lid (second 

 antenna, fig. 12e; fourth thoracic leg, fig. 12g) differs from adult female 

 and other immature males in elongate fifth and sixth leg processes. 

 Fifth and sixth legs visible in all immature males at this stage of 

 development but in form of small lappets, similar to those of adult 

 male, not extremely long projections as seen in this specimen. 



Remarks. — Wilson (1905) erected this species from a series of 

 specimens from the Galapagos Islands and from Bermuda. The 

 material that he deposited in the U.S. National Museum as the type 

 specimens (cotypes) was that from the Galapagos. The lot (USNM 

 42072, numbered 1505 in Wilson's 1905 publication) contained ten 

 females and one male taken from a specmien of Ejnnephalus labri- 

 formis (Jenyns) captured at Charles Island. At the time the present publi- 

 cation was prepared, the original lot contained only six females and one 

 immature male. 



Since WUson did not select a single specimen as the holotype, the 

 present author has taken the liberty of choosing a lectotype from the 

 original lot. The specimen chosen was an ovigerous female 3.13 mm. 

 in length from the anterior end of the body to the posterior end of the 

 caudal rami, excluding the setae. Because the characters of the 

 specimen chosen as the lectotype are in agreement with those given 

 by Wilson (1905), only a dorsal view of the specimen is shown (fig. 

 llo). 



Additional measurements of lectotype specimen: Greatest length 

 of cephalothorax, including frontal region, 2.05 mm.; greatest width, 

 excluding marginal flanges, 1.93 mm. Greatest length of genital 

 segment 0.90 mm.; greatest width 1.11 mm. 



Lepeophtheirus dissimulatus has been taken on both the Atlantic 

 and Pacific coasts. It appears to be found primarily in tropical and 

 subtropical waters although the U.S. National Museum possesses a 

 collection, identified by C. B. Wilson and by the present author as 

 this species, that was made in British Columbia. The size of the 

 specimens taken in British Columbia is more than twice that of the 

 Hawaiian specimens. The British Columbia female specimens have 

 an average length of 6.26 mm.; the Hawaiian female specimens, an 

 average length of 2.94 mm. The males from the British Columbia 

 collection were only slightly larger than the single male used in the 

 present description (3 mm. in total length to 2.20 mm. for the Hawaiian 

 specimen) . 



Genus Anuretes Heller, 1865 



Diagnosis. — ^Abdomen rudimentary, partially or completely fused 

 to genital segment. Lunules absent. Fourth thoracic legs two-, 

 three-, or four-segmented. 



