336 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



FlSURE 52.— PANOPEUS HERBSTn, MALE, 



major chela, enlarged. after 

 Benedict and Rathbun 



the lateral angle to the orbital angle. Front about two-sevenths the 

 greatest width of carapace; middle portion advanced only a little 

 beyond outer angles. 



Chelipeds heavy, granulate; carpus without a groove parallel to 

 distal margin. Dark color of immovable finger continued for a short 



but variable distance on palm. Third 

 segment of male abdomen reaching coxae 

 of feet of fifth pair; terminal segment 

 broader than long, rounded at end. 



Color. — Dull brown-green, paler below. 

 Chelipeds deeper, sometimes spotted 

 with claret brown. Fingers blackish. A 

 dirty gray or slate color (Hay and Shore). 

 Variation. — Extremely variable, espe- 

 cially as to convexity, proportionate 

 length and width, acuteness of lateral teeth, depth of sinus between 

 first and second teeth. Apart from typical herbstii or forma typica, 

 three forms are sufficiently different to be worthy of distinct names 

 and yet not so sharply separated in characters or distribution as to 

 be considered subspecies or varieties. 



FORMA OBESA Smith 



Plate 156, Figure 3 



Carapace very convex antero-posteriorly, usually shorter and 

 broader than in typical herbstii. Lateral teeth more outstanding, 

 their outer margins not forming a regular 

 curve from the lateral angle to the orbital 

 angle; the tips of the last two teeth not 

 curved inward; the third to fifth teeth less 

 sharp than in typica, the third and fourth 

 blunt in the old, third suboblong. Chelae 

 more elongate than in typica. 



FORMA CRASSA A. Milne Edwards 



Plate 157, Figure 3 



Carapace wide, much swollen in the meso- 

 branchial region. Front scarcely retreating 

 in the middle, outer angles prominent. 

 Lateral teeth more outstanding than in either 

 of the two above described forms, second 

 tooth smaller and less lobiform, last three 

 teeth widely separated, acute and with a sharp 

 granulated edge which is continued behind the fifth tooth; third tooth 

 suboblong. Proportions of chelae intermediate between those of 

 typica and obesa, and ambulatory legs narrower. Verrill's minax 

 from Bermuda appears to be the same as crassa. 



Figure 53.— Panopeus herb- 

 stii, MALE abdomen, EN- 

 LARGED. After Benedict 

 AND Rathbun 



