No. 402.] MORTH-AMERICAN INVERTEBRATES. 509 
Key to Spectes. 
A. Ambulatory legs more than twice the length of the carapace 
A. latus Rathbun, SG 
A’. Ambulatory legs less than twice the length of the carapace 
A. rostratus Rathbun, D 
Genus Batrachonotus Stimpson. . . B. fragosus Stimpson, M( CH)G 
Genus Euprognatha Stimpson . . . . &. m Stimpson, MS 
Genus Oregonia Dana O. gracilis Dana, AP 
Genus Sphenocarcinus A. Milne- pieds 
S. corrosus A. Milne-Edwards, M( CH) 
Genus Mocosoa Stimpson. . . . . . M. crebripunctata Stimpson, G 
Genus Epialtus Milne-Edwards. 
Key to Species. 
A. First tooth of the antero-lateral margin large and prominent 
B. No postocular tooth . . E. bituberculatus Sfline Edwards, D 
Fic. 3. — Epialtus productus. 
B’. A postocular tooth . . KE. productus oa APD 
A’. First tooth of the ditto labial margin small, not promine 
E. nuttallii iind D 
Genus Mimulus Stimpson . . . . . . M. foliatus Stimpson, APD 
Genus Pugettia Dana. 
Key to Species. 
A. Postorbital projection a triangular tooth. 
B. Hepatic expansion very broad . . . P. gracilis Dana, APD 1 
B’. Hepatic expansion narrow, transverse . . P. richii Dana, AD 
1 San Luis Obispo, California (Lockington). 
