106 BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



KET TO THE AMERICAN SPECIES OF THE GENUS COLLODES 



A^ Carapace with median spines. 

 B'. Rostrum bifid. 



C Ambulatory legs hairy. 



D^ Inner or lower margin of basal anteiyial article denticulate. 

 E'. Rostrum narrowed to a spine which has a bifid tip. 



tenuirostris, young, p. 113. 

 E^. Rostrum not narrowed to a spine, but with two small teeth or spines 

 at tip. 

 F'. Granules evenly distributed on branchial region. 



trispinosus, p. 107. 

 F^. Granules of branchial region unecjual, divided into two areas 



by a smooth space rostratus, small, p. 110. 



D2. Inner or lower margin of basal antennal article unarmed. Carapace 



and female abdomen coarsely granulate granosus, p. 106. 



C^. Ambulatory legs naked nudus, p. 110. 



B^. Rostrum simple, not bifid. 



Ci. Rostrum with a terminal spine tenuirostris, adult, p. 113. 



C^. Rostrum triangular, without terminal spine. 



D'. Basal antennal article with inner crest unarmed. 



rostratus, large, p. 110. 

 D2. Basal antennal article with inner crest armed with three spiniform 



teeth obesus, p. 109. 



A2. Carapace without median spines. 

 B'. Ambulatory legs not spinous. 



C. Interantennular spine advanced as far as rostrum. Chelipeds slender. 



leptocheles, p. 117. 

 C^. Interantennular spine not advanced as far as rostrum. 



D^ Carapace smooth. Postorbital lobe small levis, p. 120. 



D^. Carapace granulate or partly so. 



E^. Carapace mostly smooth, four tubercles near its center. Male 



sternum finely granulate tumidus, p. 121. 



E^. Carapace mostly granulate. Male sternum coarsely granulate. 

 F'. Postorbital lobe of good size. Basal antennal article with con- 

 spicuously dentate crests robustus, p. 114. 



F2. Postorbital lobe small. Basal antennal article with almost smooth 



crests inermis, p. 119. 



B2. Ambulatory legs spinous. Rostrum short, subtruncate armatus, p. 122. 



ANALOGOCS SPECIES OF COLLODES ON OPtOSITE SIDES OF THE CONTINENT 



Atlantic 

 trispinosus. 

 rostratus. 

 inermis. 



Pacific 



granosus. 



tenuirostris. 



tumidus. 



COLLODES GRANOSUS Stimpson 



Plate 36, figs. 1 and 2; plate 217, fig. 1 



Collodes granosus Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 1860, 

 p. 194[66], pi. 2, fig. 4 (tj'pe-locality. Cape St. Lucas; holotj^pe not 

 extant). — A. Milne Edwards, Crust. R^g. Mex., 1878, p. 177. — Rath- 

 bun, Proc. U. S. Nat. Mus., vol. 21, 1898, p. 569. 



Diagnosis. — Three median spines; rostrum sub triangular, tip 

 bifid; carapace and female abdomen coarsely granulate. 



