COMPLETE HAIG: EASTERN PACIFIC PORCELLANIDAE 25 



7a. Front narrow, strongly produced ; carpus about twice as long 

 as wide, surface with oblique striations ; merus of walking legs 

 with a row of anterior spines, that of legs 1 and 2 with a 

 posterodistal spine galathinus 



7b. Front broad, not strongly produced; carpus about Ij^ times 

 as long as wide, surface with short, flattened rugae ; merus 

 of walking legs with 1 or 2 anterior spines, a posterodistal 

 spine on the merus of leg 1 only polymitus 



8a. Anterior margin of carpus with 4-6 broad, close-set teeth. . 9 



8b. Anterior margin of carpus with 2-3 (occasionally 4) low, wide- 

 set teeth 11 



9a. Manus covered with small flattened tubercles; adults very 

 large, length of carapace to 30 mm or over. . desmarestii 



9b. Manus not covered with flattened tubercles; adults small, 



length of carapace not exceeding about 13 mm. . . .10 



10a. No strong supraocular spine, but 1 or 2 supraocular spinules 

 occasionally present; carpus less than twice as long as wide, 

 anterior margin with 4 (rarely 5 or 6) teeth. . marginatus 



10b. A strong supraocular spine; carpus a little over twice as long 

 as wide, anterior margin with 5 or 6 (rarely 4) teeth. 



hirtispinosus 



11a. Anterior margin of carpus with 2 teeth ; merus of walking legs 

 with 1 or 2 anterior spines robsonae 



lib. Anterior margin of carpus with 3 (occasionally 4) teeth; 



merus of walking legs with 2-6 anterior spines . . . .12 



12a. Carapace nearly as wide across mid-branchial regions as pos- 

 teriorly ; epibranchial spine distinct ; no short pubescence on 

 outer margin of ventral surface of manus. . . armatus 



12b. Carapace widest posterior to mid-branchial regions; epibran- 

 chial spine usually absent or vestigial, rarely distinct ; ventral 

 surface of manus with a narrow band of short pubescence 

 along outer margin nobilii 



13a. Merus of walking legs nodulate on anterior margin. 



tibiironensis 



13b. Anterior margin of merus of walking legs unarmed. . .14 



