THE GEAPSOID CRABS OP AMERICA. 



279 



Description. Dorsal surface very uneven, covered with irregular 

 punctures, and toward the lateral borders with tubercles, a few 

 tubercles on the gastric region. Interregional grooves deep. Epi- 



Fio. 141. PLATYCHIUOGRAPSUS TYPICUS, MALE (19SG3), DOUSAL VIEW, SLIGHTLY UEDCCED. 



gastric lobes high, granulate; between them a deep furrow runs to the 

 margin of the front. A very small protogastric lobule is situate near 

 the upper fissure of the orbit. Outer portion of branchial region 

 rather steeply inclined. 



a b 



Fio. 142. PLATYCHIROGHAPSOS TYPICOS, MALE HOLOTYPE. a, ODTEIJ MAXILLITED (DOTTED 



LINE SHOWING MEDIAN LIXE), X 4 J 6, AUUOMEN, X 1J ', C, U1GHT OUB1TAL AXU AXTEX- 

 KAL KEC1ON, VEXTltAL VIEW, X 2J. 



Front bilobed, a deep U-shaped median sinus; lobes irregular, 

 highest near the outside, margined with horny-tipped spinules, as are 

 also the upper margin of the orbit and the outer margin of the lateral 

 teeth. Front separated from the inner border of the orbit by a 



