18 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 124 



The corneal indices of the two females of H. harpax reported here, 

 CL 21.0 and 28.5, are 269 and 320; in the two males (including the 

 lectotype), CL 29.1-32.2, they are 316 and 358, respectively. Tiwari 

 and Biswas (1952) reported a range of 2.7-3.2 (270-320) in their 

 material. Not enough material is available to determine if there are 

 any sexual or geographic differences in the corneal indices of this 

 species. 



The eyes of H. melanoura, new species, appear to be larger, and the 

 range of corneal indices, 229-252, indicates that the cornea is appre- 

 ciably broader in that species. 



The corneal index of the specimen reported from Australia by 

 Manning (1966), a female, CL 30.6, was 336, which falls within the 

 range observed for H. harpax. In the Australian specimen, however, 

 the eye appears to be more inflated than in H. harpax. 



Distribution. — Indo-West Pacific, from the Red Sea and East 

 Africa to Japan. 



Harpiosquilla melanoura, new species 



Figure 5 



Holotype. — 1 cf, 128.6; Banc de Pracel, western coast of Mada- 

 gascar; 55 m; sand; A. Crosnier; July 1959; USNM 124092. 



Para types. — 1 9, 135.6; Banc de Pracel, western coast of Mada- 

 gascar; 55 m; muddy sand; A. Crosnier; June 1959; USNM 124093. 

 1 &, 101.6; 1 9, 126.1; same; MNHNP. 



Description. — Eye large, T-shaped, cornea bilobed, set almost 

 transversely on stalk; eyes extending anteriorly almost to end of 

 first segment of antennular peduncle; ocular scales obliquely truncate 

 or rounded, situated laterally; anterior margin of ophthalmic somite 

 rounded; corneal indices 229-252. 



Antennular peduncle slender, slightly longer than carapace; dorsal 

 processes of antennular somite broad, each tapered to an acute apex, 

 directed anterolaterally. 



Antennal scale slender, curved, two-thirds as long as carapace. 



Rostral plate triangular, longer than broad, without carinae; lateral 

 margins sinuous, convex posteriorly, concave anteriorly, converging 

 on slender, blunt apex; plate extending just beyond dorsal margin of 

 antennular somite. 



Carapace narrowed anteriorly, anterior width less than one-half 

 median length; anterolateral spines strong but not extending to base 

 of rostral plate; median carina completely absent; intermediate 

 carinae not extending to anterior margin. 



Mandibular palp and 5 epipods present. 



Raptorial claw large, propodus slightly less than half again as long as 

 carapace; dactylus with 8 teeth, outer margin of dactylus evenly 



