NS ia PROCEEDINGS OF THE NATIONAL MUSEUM. 233 
C” Carapace subtriangular. 
D’ Carapace with a series of lateral spines or teeth. 
EK’ Lateral margins with sharp spines..........-...-...--.---- -. -Pericera. 
KE” (Lateral margins laminate and dentate) ...-..--..-.-..... Anaptychus. 
D” Carapace without a series of lateral spines or teeth. 
KE’ Spines of rostrum very slender and contiguous.......--..---.Tiarinia. 
Ki” Spines of rostrum slender and more or less divergent. 
FY’ (Spine at antero-external angle of antennal joint very short and not 
MIST DLentnOmM: TOOME) Sessa alae eis See ee eee 2 = LOCANCUUS: 
F’ Spine at antero-external angle of antennal joint very long and visi- 
DlEFIROMMEA DOVE s came. = arose kere. rc a ee aie alee (ean tl Vicrophrys. 
E’’ Spines of rostrum parallel or nearly so. Orbits tubular.. Macroceloma. 
E’”’ (Spines of rostrum short, divergent, obliquely detlexed) .. Entomonyzx. 
Othoniine. 
A’ Carapace with margins regularly dentated...........2..-..<.--2.-cs.-ece Othonia. 
to} D 
A’ (Carapace with margins not dentated)-.........-......2:.....--.--- Cycloceloma. 
Mithracine. 
A’ Ambulatory legs dilated and compressed. Rostrum minute........-...---. Thoe. 
d boo} 
A” Ambulatory legs not dilated and compressed. 
B’ (Basal antennal joint without spines at distal end). ..................Parathoe, 
B” Basal antennal joint with one or more spines at distal end. 
C’ Lateral margins with tubercles or spines..............-..-.....-.-- Mithraz. 
C” (Lateral margins without tubercles or spines).............-...-- Paramaya.* 
KEY TO SPECIES EXAMINED. 
Libinia. 
A’ Carapace with margin evenly rounded behind the front. 
B’ Orbital fissures open; carapace narrowly pyriform.................. mexicana. 
B” Orbital fissures closed; carapace broadly ovate. 
C’ Rostrum defiexed. 
Pie Nh eariath ADUNGR SUKI So oro ac oe lot esas. <b Soe ols ae ree dubia, 
Para, SPIGOS MING s..2 ian) on Swieiee tae See eee Sore eee ee emarginata, 
Gy Rostrum pointing obliquely upward. 22-2. 22. 2..2.4. 225. 23). setosa. 
A” Carapace distended at the hepatic regions. 
REE TOES SPUNGUS Siz aye as sie 3 sicfa a Sac 2 cial /aais op area ei So Sk css spinimanda. 
eee R MANION occ 28 aya ins J fa en oe anak Moers co eee eee a ee 2 macdonaldi. 
Been MAT ODUM G SUSE Ree aces fh 2 2s cee Se oo cy Ws aoe eect kee es a ene edwardsii. 
Lissa. 
Gastric region divided hy deep grooves from the cardiac and branchial regions. chiragra. 
Picroceroides, 
floras of rostrum sender and divergent ......--..~-i2i02-.0. 0220-4 2--0ee tubularis. 
*This genus is doubtfully referred to the Periceride. 
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