56 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



The locality from which it was obtained, an extensive reef one mile 

 northeast of Cabeza Ballena, is not more than four miles from Cape 

 San Lucas, the type locality, and would have been accessible to John 

 Xantus, the collector, afoot or on horseback. 



Eucinetops rubellula Rathbun 

 Plate A, Figs. 1-6 ; Plate B, Fig. 6 



Eucinetops lucasii Stimpson, 1860b, p. 192, male, pi. 2, fig. 3; not E. 



lucasii female. 

 Eucinetops rubellula Rathbun, 1923a, p. 73; 1925, p. 86, pi. 219, fig. 6. 



Type: Male holotype, length 8 mm, width 6.2 mm, not extant. 

 Male neotype, U. S. N. M. No. 74440, from Mazatlan, Sinaloa, 

 Mexico, February, 1930, H. N. Lowe, collector. 



Type locality: Cape St. [San] Lucas, Lower California, Mexico; 

 John Xantus, collector. 



Diagnosis: Rostral horns small, rounded, widely and deeply 

 separated. Eyestalks long, moderately slender, and overreaching short, 

 subacute postorbital spines by more than half their length. First movable 

 antennal article narrow, strongly produced externally. Fingers of adult 

 male meeting without gape. Male first pleopod with minute, rounded 

 lateral projection. Carapace posteriorly margined. 



Description: Carapace subrectangular, almost devoid of tubercles, 

 branchial and intestinal regions broadly rounded, gastric and cardiac 

 regions elevated and surmounted with hooked hairs. Rostrum short, 

 horns divergent, outer edges subparallel, tips rounded, separated by a U 

 as broad as one of the horns, each with a longitudinal row of hooked 

 hairs above and a transverse row of straight hairs beneath. Eyestalks 

 long, slender, little constricted medially, overreaching the acute, spine- 

 tipped postocular tooth by more than half their length. Cardiac and 

 gastric regions raised, nontuberculate, and delimited from the adjacent 

 branchial and hepatic regions and from each other by shallow depressions, 

 giving the carapace an uneven appearance. Hepatic regions tumid. In- 

 testinal region projecting strongly backwards, entire posterior edge of 

 carapace conspicuously margined. Three or four small, sharp tubercles 

 in a longitudinal line at each lateral branchial angle, a row of hooked 

 hairs, some arising from granulous bases, continuing forward onto the 

 hepatic region. A prominent cluster of hooked hairs on each epigastric 

 and epibranchial region. Basal antennal article broad, a minute spine 



