SOME NEW SPECIES OF BRACHYURAN CRABS FROM 



MEXICO AND THE CENTRAL AND SOUTH 



AMERICAN MAINLAND 



(Plates 11-26) 



By John S. Garth 



INTRODUCTORY REMARKS 



The present paper resumes the study of the Brachjmra collected by 

 the Allan Hancock Expeditions on the Pacific Coast mainland of 

 Mexico, Central America, and South America, from the point reached 

 by Dr. Mary J. Rathbun, whose preliminaiy descriptions of six new- 

 species of oxystomatous crabs from this area appeared in the Proceedings 

 of the Biological Society of Washington, vol. 46, p. 183 (1933), and 

 vol. 48, pp. 1-3 (1935), and whose report on the Oxystomata of the 

 Allan Hancock Expeditions prior to 1935 was incorporated in Bulletin 

 166 of the U. S. National Museum (1937). 



One of the descriptions appearing in the following pages was taken 

 from the unpublished manuscript "A Report of the Brachyura collected 

 on the Hancock Pacific Expedition of 1933 at Stations other than those 

 of the Galapagos Islands," submitted by Mr. Fred C. Ziesenhenne to 

 The University of Southern California in partial fulfillment of the 

 degree Master of Science and is attributed to his authorship. Another is 

 the work of Mr. Steve A. Glassell, who was first to call attention to the 

 dissimilarity between the Daldorfia species herein described and Thyro- 

 Imnbrus erosus Rathbun. 



The accompanying illustrations are from the pen of Mr. Anker 

 Petersen, staff artist of the Allan Hancock Foundation, with the ex- 

 ception of figures 4 and 6 of plate 15, drawn by Miss Jane Roller under 

 the direction of Dr. Waldo L. Schmitt. Color notes were taken from 

 living specimens and are expressed according to Ridgway, "Color Stand- 

 ards and Color Nomenclature" (1912). 



Once again the writer acknowledges his indebtedness to Dr. Waldo 

 L. Schmitt for assistance in the field and in the laboratories of the U. S. 

 National Museum, and for the loan of comparative material used in 

 these studies. He is also under obligation to Dr. William Beebe for 

 permission to examine the holotype of Chasmocarcinus ferrugineus and 



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