No. 402.] MORTH-AMERICAN INVERTEBRATES. 511 
Genus Rhodia Bell . . . . . CO parvifrons (Randall), D 
c Hire camptacantha Stimpson 
Genus Loxorhynchus Stimpson. 
Key to Spectes. 
A. Hepatic region with two large spines . . Z. grandis Stimpson, PD 
A’. Hepatic region with one large spine . . ZL. crispatus Stimpson, D 
Genus Hemus A. Milne-Edwards . JH. créstulipes A. Milne-Edwards, G 
Genus Pitho Bell. 
Key to Spectes. 
A. Carapace smooth, pubescent . . . P. anisodon (von Martens), G 
Fic. 5. — Hyas lyratus. 
A’. Carapace tuberculous. . . . |. «P. lherminieri (Schramm), S 
Genus Mithrax Latreille.! i] 
Key to Species. 
4. Carapace with dorsal sulci on the branchial regions 
M. forceps (A. Milne-Edwards), M( CH)S 
A’. Carapace without dorsal sulci on the branchial regions. 
B. Divisions of rostrum tuberculiform. 
C. Tubercles of the carapace faintly indicated 
M. hispidus (Herbst), S 
C. Tubercles of the carapace well marked 
AM. pleuracanthus Stimpson, M( CH ).5G 
1 M. denticulatus Bell, M. tuberculatus Stimpson, and Teleophrys cristulipes 
Stimpson are recorded from California by Miers, but this is very likely an error, 
as Miers used “ Californi ia” and * Lower California” interchangeably. 
