658 NEW SPECIES OF FRESH-WATER CRABS RATHBUN. 



SYNOPSIS OI" SI'KCIKS. 



A' Superior frontal crest i)rojecting beyoiul the inferior. 



B' Carapace granulated near the margins above and below riJHKNSis. 



B" Carapace not granulated near the margins :....' ahmata. 



A" Superior frontal crest not projecting beyond the inferior. 



B' Carapace witli coarse scaly granules near the margins above and 



below CliANULATA. 



B" Carapace without coarse scaly grannies near the niai'gins iiaytensis. 



Epilobocera haytensis. 



(PI. LXX^•II, Figs. 1 and r>.) 



Carapace veiy slightly convex, finely graiinlate, and punctate. Cer- 

 vical sulcus deep. Cardiac region with shallow depressions on either 

 side, and two minute Y-shaped grooves in the sulcus between the 

 gastric and cardiac regions. Epigastric lobes distinct, separated by a 

 Avell-marked sulcus, which extends forward and forms a wide median 

 sinus in the superior frontal margin. This margin is prominent and 

 nearly straight when seen from above, but slopes downward toward the 

 middle, and in the largei- specimen the two halves are inclined slightly 

 backward toward the median line. The margin is unevenly tubercu- 

 late, and near the orbital border it is directed backward and ends above 

 the base of the eye. The inferior margin of the front is three-lobcd, the 

 median lobe directed downward and forward, the lateral lobes ronn<led 

 and horizontal, projecting well beyond the superior margin. The mar- 

 gin is crenulate, and also the orbital border, which is continuous with 

 it. There is a bi'oad hiatus beneath the outer angle of the orbit. The 

 internal suborbital lobe is very broad aud concave, and nearly, but not 

 (juite, touches the subfrontal procivss. Tlie antero-lateral margin is 

 marked by small blunt teeth, irregular in size and shape, and inter- 

 rupted by a wide sinus at the cervical suture, and another lU'ar the ex- 

 ternal orbital angle. The teeth become smaller and more indistinct 

 near the posterolateral nuirgin, which is slightly concave, smooth, and 

 rounded The marginal teeth are less plainly marked in the smaller 

 specimen. Labial border of the epistome with three lobes; median lobe 

 acute, i)rojecting dowuAvard and slightly forward; lateral lobes shorter, 

 less acute, their inner margins arched ui)Avard and forward. The mar- 

 gins of the lobes are tuberculate. On the lower side of the carapace 

 there is a line of tubercles following the cervical suture, and the ante- 

 rior portion of tlie Jugal area is tuberculate. The endognaths of the ex- 

 ternal maxillipeds in width do not exceed the buccal cavity; the merus 

 is more or less quadrate, tlie antero-extermil angle rounded (Fig. 5). The 

 male abdomen is widest at the third segment, and does not taper regu- 

 larly to the last, but the nmrgins of the fourth, lifth, and sixth segments 

 are separately convex. The appendages of the first segment are bent 

 outwards at almost a right iuigle near the extremities, M'hich are lobed 

 and spinulilcidns. (^liclipcds nnciiual. The merus is armed with stout 



