486 MR. E. I. POCOCK ON THE 



Genus Ehinocbicus. 

 Synopsis of the Species. 



a. Anterior border of the segments not furnished 



with circular or crescentic impressions (scobina). 



a}. The anal tergite acutely angled behind ; the 



transverse sulcus complete dorsally; black, 



with median dorsal series of pale spots Ramagei, sp. n. 



b^. The anal tergite bluntly rounded behind, 

 a'-. The transverse sulcus deep and complete 



dorsally mandevillei, sp. n. 



b"^. The transverse sulcus obsolete or very weak 

 dorsally. 

 a^. Collum with strongly marginate border . . poJitus, Por. 

 b^. Collum with border scarcely marginate . . Gossei, sp. n. 



Townsendl, sp. n. 



b. Anterior border of some of the segments furnished 



with scobina. 



a*. Clypeus very deeply excised excisus, Karsch. 



V. Clypeus lightly and normally excised. 



a^. The segments not furnished with a second 



transverse groove in front of the ordinary 



sulcus (not always strictly true of arhoreus), 



a^. The posterior border of the segments 



above the scobina bisinuate ; no caudal 



process. 



a'. Pores scarcely above the middle of the 



side ; scobina reaching only to the 



12th segment parous, Karsch. 



v. Pores well above the middle of the 

 side; scobina reaching to the 24th 



segment holomelanus, sp. n. 



b^. The posterior border of the tergites not 

 bisinuate. 

 a^. The anal tergite not produced into a 

 process surpassing the valves, 

 ffl^. Species of large size, from 75-163 

 mm. in length, and with from 47-54 

 segments. 

 a}°. Antennae long, reaching the 3rd 



segment doming ensis, Sauss. 



b^°. Antennae short, scarcely sur- 

 passing the collum Maltzani, sp. n. 



Probably also haitensis 

 and Duvernoyi. 



