part 1 garth: pacific oxyrhyncha 381 



the movable flagellum of the external antennae longer than is usual in 

 Mith 



rax 



Chelae less developed than usual. In the male, hand compressed, 

 carinate above and below, and smooth ; a single tubercle on its external 

 surface, near the carpal articulation. Forearm slightly tuberculate and 

 prolonged on the inside. Arm nodose and tuberculate. Ambulatory legs 

 nearly glabrous and covered with lamelliform spines or with sometimes 

 imbricate crests. (A. Milne Edwards, modified, of a Bay of Panama 

 specimen) 



Considerable variation was observed in the extensive series examined. 

 This was of two sorts: individual, within a given local population, and 

 geographical, from one population to the next. Individual variation was 

 found to be concerned almost entirely with the amount of spinulation of 

 the lateral margins of the carapace and the degree of roughness of the 

 ambulatory legs. The former could be almost smooth or bristling with 

 spinules ; the latter might be almost devoid of cristae or fairly limbed. 

 Geographical variation was apparent as a series of parallel clines for a 

 number of characters, some of which have been used heretofore to sepa- 

 rate Teleophrys cristulipes from the related T. tumidus of Peru. (Cf. 

 Garth, 1946, p. 400) 



In specimens from near the type locality in the Gulf of California and 

 from the Revilla Gigedo Islands, the rostrum is of moderate length and 

 widely and deeply cleft ; in specimens from Panama south to Ecuador 

 the rostrum is short, the shallow lobes remaining well separated. Simi- 

 larly, while northern specimens have the anterior branchial region (mis- 

 takenly called the hepatic) enlarged and crowded toward the smaller 

 hepatic region, southern specimens have the anterior branchial region 

 less strongly developed. Finally, while in northern specimens the propodus 

 is devoid of lateral ornamentation, in southern specimens a lateral tuber- 

 cle or spine may be present ; however, this is never broadened into a 

 flange, as in Teleophrys tumidus. 



Material examined: 328 specimens from 52 Hancock stations. (See 

 Table 78) From Santa Maria Bay, Lower California, and Agua Verde 

 Bay, Gulf of California, Mexico, to La Plata Island, Ecuador, including 

 Socorro and Clarion Islands of the Revilla Gigedo group. In addition 

 to the above, 55 specimens from 5 Askoy stations (Garth, 1948, p. 29), 

 and 1,231 specimens from 62 Hancock Galapagos stations (Garth, 1946, 



*A. Milne Edwards considered Teleophrys to be a section of Mithrax (Mith- 

 raculus). 



