250 bulletin: museum of comparative zoology. 



212b. Polylepiscus roreri, sp. nov. 



Tijpe.— M. C. Z. 4,576. Trinidad: ^Lt. Tucutche. In a brome- 

 liad. J. B. Rorer. 



This is the first representative of the Central American Polyle- 

 piscus to be recorded from the West Indies. In comparison with the 

 Central American species it falls with the forms under 65 mm. in 

 length and agrees with P. stolli in having the polygonal areas wholly 

 smooth. From that species it may be distinguished, e. (f. in having 

 the keels of the tenth and eleventh plates much less strongly produced 

 caudad. 



It is apparently a much darker species. The prozonites black 

 above and down the sides, becoming light brown ventrally. The 

 anal valves are also black as is also the anal scutum excepting across 

 its distal end. The metagonites are black over the keels and in a 

 narrow stripe along the anterior edge, elsewhere being dilute ferru- 

 ginous brown. The antennae are fuscous, the legs dilute yellowish 

 brown. Head and first tergite black or nearly so, the former paler 

 across labrum and the latter along caudal border. 



While the collum is nearly smooth in the median region, it is strongly 

 sculptured on the sides; short longitudinal sulci outline a row of 

 areas along the caudal border, while areas along the anterior border 

 are less distinctly outlined. On subsequent tergites the polygonal 

 areas are outlined entirely across but on the first ones are much more 

 strongly developed down the sides and over the keels than on mid- 

 dorsal region, the areas becoming more sharply defined caudad. 

 Keels with anterior angles rounded, anterior margin smooth, not at all 

 serrulate as in P. stolli; the caudal margin weakly and irregularly 

 crenulate; the posterior processes similar to those of stalli but shorter, 

 this being especially noticeable on the segments of the median region. 

 Processes of eighteenth and nineteenth segments spiniform, acute, 

 those of the latter not apically blunt as they are in P. stolli. Pores 

 of nineteenth segment more strictly lateral than those of preceding 

 somite. 



Length ( 9 ), about 55 mm.; width, 7.5 mm. 



