5 16 THE AMERICAN NATURALIST. [VoL. XXXIV. 
A’, Last two pairs of legs much reduced in size, and having a peculiar 
position in the dorsal plane of the body 
DorIPPIDÆ Milne-Edwards, White 
KEY TO THE GENERA OF THE FAMILY CALAPPIDÆ. 
A. Antero-lateral margin continuous with the postero-lateral. 
B. Carapace broadest in its posterior half . . . . . . Calappa 
B’. Carapace broadest in its anterior half. . . . .Acanthocarpus 
A’. Antero- and postero-lateral margins meeting at an angle armed with a 
sour De a s- y Fave 
THE SPECIES OF CALAPPIDÆ. 
Genus Calappa Fabricius. 
Key to Species. 
A. Teeth of the posterior margin of the carapace broad and shallow 
C. flammea (Herbst), MSG 
A’. Median pair of teeth of the posterior margin long and slender 
C. sulcata Rathbun, M(CH)G 
Fic. 12. — Calappa sulcata. 
Genus Acanthocarpus Stimpson. . A. alexandri Stimpson, MG 
Genus Platymera Milne-Edwards . P. piudichandis Milne-Edwards, PD 
KEY TO THE GENERA OF THE FAMILY MATUTID&. 
4. Carapace much broader than long ; front not produced ; surface evenly 
convex . Hepatus 
A’, Carapace nbasty as «Toii as (badi Jhon. considerably produced sur- 
face very uneven, nodulose . . Osachila 
