36 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 124 



Etymology. — The species is named for the collector, Arthur G. 

 Humes. 



Distribution. — Known only from Nosy Be, Madagascar. 



Lysiosquilla Dana, 1852 



Only two species of Lysiosquilla have been recognized from the 

 Indo-West Pacific region in recent years, L. capensis Hansen, 1895, 

 and L. maculata (Fabricius, 1793). Two varietal forms of the latter 

 species, L. m. var. sulcirostris Kemp, 1913 and L. m. var. tredecim- 

 dentata Holthuis, 1941, also have been recognized. All four of these 

 forms are distinct species that may be distinguished by means of the 

 key below. 



A redescription of L. capensis Hansen is in preparation. 



Two species of Lysiosquilla, maculata and tredecimdentata, occur off 

 Madagascar. 



Key to Indo-West Pacific Species of Lysiosquilla 



1. Rostral plate triangular, greatest width at base; median carina of plate 



flanked by longitudinal grooves; dactylus of claw with 8 teeth. 



L. sulcirostris Kemp, 1913 



Rostral plate cordiform, greatest width in advance of base; median carina of 



plate, when present, not flanked by longitudinal grooves; dactylus of claw 



with more than 8 teeth 2 



2. Antennal scale oval, less than twice as long as broad; anterior margin of 



antennal protopod lacking projection; ventral keel of eighth thoracic 



somite rounded L. maculata (Fabricius, 1793) 



Antennal scale slender, elongate, more than twice as long as broad; anterior 

 margin of antennal protopod with projection; ventral keel of eighth tho- 

 racic somite acute, sharp, posteriorly 3 



3. Rostral plate lacking median carina; ventral surface of uropodal protopod 



with slender spine at articulation of endopod . . L. capensis Hansen, 1895 

 Rostral plate with median carina; ventral surface of uropodal protopod lack- 

 ing spine at articulation of endopod . . L. tredecimdentata Holthuis, 1941 



Lysiosquilla maculata (Fabricius, 1793) 



Figure 12 



Lysiosquilla (Miers) maculata. — Lenz and Richters, 1881, p. 428. 



Lysiosquilla maculata. — Kemp, 1913, p. Ill, pi. 8 (fig. 89-91) [older references]. — 

 Monod, 1925, pi. xxi (fig. d).— Holthuis, 1941, p. 269, fig. 5.— Barnard, 1950, 

 p. 855, figs. 3d, 4c-d— Serene, 1954, pp. 6, 8, 11, 13, 64, 66, fig. 12, pi. 5 

 (figs. 1-2), pi. 6 (figs. 1-2). — Kurian, 1954, p. 86. — Stephenson and McNeil, 

 1955, p. 246.— Manning, 1962, p. 2; 1967, p. 103. 



Lysiosquilla maculata maculata. — Ingle, 1963, p. 23, figs. 23, 45, 61, 72 [part; not 

 specimen from Gulf of Aden]. 



Previous records. — Lenz and Richters, 1881; Monod, 1925. 

 Material. — 1 9, 146.0; Nosy B6, Madagascar; intertidal zone; A. 

 Crosnier; May 1960; USNM. 



