No. 402.] MORTH-AMERICAN INVERTEBRATES. 507 
F’. Basal joint of antenna not deeply concave; 
second and third joints not broadly expanded. 
G. Rostral horns long and slender . Chorilia 
G'. Rostral horns not long and slender. 
H. Basal antennal joint narrowing dis- 
tall | wv e Rhodia 
H’. Basal detail” joint not narrowing 
ist Loxorhynchus 
ay 
Č. Orbits complete, often tubular, cole piltély Alosctellag the 
retracted eye. 
D. Meral joints of ambulatory legs with very broad laminate 
expansions . . Hemus 
D’. Meral joints of dbuigiber leg ‘without aciients ex- 
pansions. 
E. Fingers spoon-shaped at tips. 
F. Carapace suboblong or suboval. Orbits di- 
rected forward. First movable joint of 
antennz broadly expanded. Legs unarmed 
Pitho 
Æ. Carapace subtriangular. Orbits directed ob- 
liquely forward. First movable joint of 
antenne not broadly Pme Legs spi- 
uw. wis . Mithrax 
nous 
E'. Fingers acute at tips. 
F. Orbits tubular, directed outward. Carapace 
subtriangular or oblong. 
G. Carapace with lateral pone 
Stenocionops 
G'. Carapace without pim spines 
Macroceeloma 
F’. Orbits not tubular, directed obliquely forward. 
Carapace orbicular. 
G. Basal joint of antennz with two spines on 
the inferior margin of the orbit 
Coelocerus 
G’. Basal joint of antennz without spines on 
the inferior margin of the orbit 
: Libinia 
THE SPECIES OF MAIID&. 
Genus Stenorynchus Lamarck . S. sagittarius (Fabricius), M(CH)SG 
Genus Metoporhaphis Stimpson. . . M. calcarata (Say), M(CH)SG 
Genus Podochela Stimpson. 
