510 REPORT ON THE ORDER STOMATOPODA—BIGELOTV. vol.xvii. 



a". Dactylns with 5 teeth. 



Rostrum wider than lons- 



CHLORiDA, Brooks. [^? UECf'RATA, Wood-Mason.] 

 a™. Dactylus with f) teeth, eyes nearly cylindrical. 



Telson with crest and obsolete curved lines of pits; denticles 0, 6-7, 1. 



LATA, Brooks. 

 Telson with 4 or 5 carinic on each side of the crest; denticles 4, 8, 1. 



KASCIATA, de Haan. 



b. 8 distinct carinie on the first 5 abdominal somites, the dorsal surface of the 



telson on each side of the crest either smooth or marked by 



symmetrically curved lines of pits. 



&'. Lateral process of the fifth thoracic somite on each side a single spine, a 



pair of ventral sjiines also present. 



1. Eyes small. 



Eye stalk dilated; lateral spine of the fifth thoracic somite promi- 

 nent, flattened dorso-ventrallj', and acute; denticles on tel- 

 son 1-3, 3-4, 1 DCBiA, Milne-Edwards. 



Eyes triangular, stalk not dilated; lateral spine of the fifth thoracic 

 somite short, flattened autero-posteriorly, and blunt; den- 

 ticles on tlie telson 3-4, 8, 1 parva, Bigelow. 



2. Eyes large and triangular. 



* Dactylns with 4 teetii. Denticles on the telson 12, 12, 1. 



LEi'TOSciUiLLA, Brooks. 



* * Dactylns with 5 teeth. 



Lateral spine of the fifth thoracic somite straight ami acute. 



DUFRESNii (Leach), Miers=rRASiNOLiNEATA (Dana), Ives. 

 Lateral spine of the fifth thoracic somite longer and slightly 



curved ■ praSinolineata (Dana ?), Bliers. 



Lateral spiue of the fifth thoracic somite strongly falcate and 



acute SCORPIO, Latreille. 



* * * Dactylus with 6 teeth. 



Corneal and peduncular axes of the eye at right angles; lateral 

 sjjine of the iifth thoracic somite short, straight, and acute; 

 denticles on the telson 5-6, 11-12, 1 mantoidea, Bigelow. 



Corneal and peduncular axes of the eye nearly at right angles; 

 lateral spine of the fifth thoracic somite curved forward and 

 acute; marginal spines of the telson enormously developed 

 in the males ; denticles 3-4, 5-7, 1 ACr leata, Bigelow. 



Corneal and peduncular axes of the eye distinctly oblique to 

 one another ; lateral sjiine of the fifth thoracic somite curved 

 forward and acute; no thickening of the telson in males; 

 denticles 4, 6-8, 1 empusa, Say. 



* Jjateral spine of the fifth thoracic somite straight and acute, 



margin of telson slightly thickened in males; denticles 3 or 

 4,8-11, 1 MANTIS, Latreille. 



Lateral spiue of the fifth thoracic somite siiatuliform, other\.ise 

 like S. inantis neulecta, Gibbes. 



Lateral spine of the fifth thoracic somite curved forward and 

 acute; luargin of the telson much thickened in males, the 

 thickening being interrupted on the outer side of each of 

 the 6 marginal spines; denticles 5, 10-11, 1-2. 



panamensis, Bigelow. 



Lateral spine of the fifth thoracic somite very strongly curved 

 forward ; marginal thickening on the telson of the males 

 continuous between the intermediate spines; denticles 4-6, 

 10-13, 1 intermedia, Bigelow. 



