58 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



be expected to show it, considering the rapidity with which color fades 

 in alcohol. 



It is to be hoped that a larger male specimen of Eucinetops rubellula 

 will soon be found, and that the female of the species will be made 

 known in subsequent explorations. The selection of a neotype from a 

 locality other than the type locality is not a recommended procedure. 

 However, both Mazatlan and Cape San Lucas lie in the same latitude, 

 although on opposite sides of the Gulf of California. 



Eucinetops panamensis Rathbun 

 Plate A, Fig. 8 ; Plate B, Fig. 5 ; Plate 3, Fig. 2 



Eucinetops panamensis Rathbun, 1923a, p. 73; 1923b, p. 633; 1925, 

 p. 87, pi. 23, figs. 3, 4, text-figs. 22, 23. Steinbeck and Ricketts, 

 1941, p. 466. Crane, 1947, p. 71. Garth, 1948, p. 22. 



Type: Holotvpe male, length 10.5 mm, width 8.5 mm, M.C.Z. No. 

 2040. 



Type locality: Pearl [Perlas] Islands, Bay of Panama; S. W. 

 Garman, collector. 



Localities subsequently reported, with collectors: Mexico: Gulf of 

 California: San Francisquito Bay, Albatross (Rathbun, 1925) ; San 

 Carlos Bay (Steinbeck and Ricketts) ; Costa Rica: Port Parker, Piedra 

 Blanca, Uvita, Zaca (Crane) ; Bay of Panama: [Bahia] Honda, Zaca 

 (Crane). 



Atlantic analogue: Eucinetops blakiana Rathbun. 



Diagnosis: Rostral horns short, broad, joined basally for two-thirds 

 of their length, each tipped with a spine. Postorbital spines triangular. 

 Eyestalks of moderate length, only corneas extending beyond postorbital 

 spines. First movable segment of antenna broad as long, and broad as 

 adjacent rostral spine. Carapace tuberculate, branchial and hepatic row 

 of tubercles defining lateral margins. Male first pleopod with a spinous 

 thumb process. 



Description: Carapace high on the median line and strongly tuber- 

 culate there; three large tubercles covering the cardiac region and a 

 smooth oblong tubercle forming a bridge to the gastric region; a large, 

 median intestinal tubercle. Branchial regions also tuberculate. Lateral 

 angle marked by a small but strong spine ; anterolateral margin nearly 

 straight, tuberculate, interrupted slightly between the hepatic and 

 branchial regions. Rostrum one-third as wide as the fronto-orbital 

 distance, divided less than half way into two shallow triangular teeth, 

 each tipped with a small sharp curved spine. Postocular tooth large, 



