COMPLETE HAIG : EASTERN PACIFIC PORCELLANIDAE 115 



Measurements: Males, 2.9 to 5.2 mm; non-ovigerous females, 2.8 

 to 5.4 mm; ovigerous females, 4.1 to 5.7 mm. The ovigerous female 

 holotype measures 5.5 by 5.5 mm; male paratype, 4.9 by 4.8 mm. 



Color: Color in alcohol uniform light red. (Glassell) Specimens in 

 the collection of the Allan Hancock Foundation are a light orange 

 buff; a few show traces of broad reddish stripes on the fingers. 



Ecology: With one exception, all known specimens have been taken 

 from under stones in the intertidal zone. The typical subspecies was 

 once collected at Isla Isabel, Mexico, from a rocky substrate in 0-3 

 fathoms. 



Ovigerous females were collected in every month from December 

 through April. 



Remarks: The species as a whole ranges throughout the Panamic 

 Province, but material is lacking for the area between Bahia de Te- 

 quepa, Mexico, the most southerly locality at which the typical sub- 

 species was taken, and Bahia de Salinas, Costa Rica, north of which 

 the new subspecies was not found. Therefore it cannot be determined 

 at the present time where the break between the two populations oc- 

 curs. 



Range: Isla del Carmen, Gulf of California, south to Bahia de 

 Tequepa, Mexico; Isabel and Tres Marias Islands. 



PetroHsthes lewisi austrinus, new subspecies 

 Plate 5; plate 23, fig. 2 



PetroHsthes sinuimanus, Nobili, 1901b, p. 15. Rathbun, 1910, p. 599 

 (part). Not Megalobrnchium sinuimanus (Lockington). 



PetroHsthes lewisi, Haig, 1957b, p. 7 (part of new records; not all 

 synonymy). Not P. I. lewisi (Glassell). 



Previous records: Panama. Isla Flamenco: E. Festa (Nobili). 

 Guayabo Chiquito: Askoy (Haig). 



Types: Holotype, male, U. S. National Museum Cat. No. 102406, 

 from Port Parker, Costa Rica, rocky shore; February 9, 1935; col- 

 lected during Allan Hancock Pacific Expedition of 1935 at Velero 

 III station 466-35. Paratypes: 145 specimens from the same and 18 

 other stations (see Table 36). 



Diagnosis: Carapace nearly smooth, anterior regions and grooves 

 strongly accentuated; no epibranchial spine; front trilobate; carpus 

 about one and a half times as long as wide or a little less, proximal 



