24 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



two-thirds (except for an oval median depression) strongly elevated 

 to a high caudal margin that overhangs the following prozonite, the 

 surface of the margin coriaceous-tuberculate, lacking transverse 

 series of larger tuberculcs. 



Following segments generally similar in shape and sculpture; the 

 paranota of segments 2 and 3 swept forward and much wider (10.0- 

 10.5 mm.) than collum, laterally each produced into two sharp 

 spicules. Metazonites of segments 2-4 strongly produced above 

 level of adjacent prozonites and provided with a posterior submarginal 

 series of 14-16 small, flat, nearly contiguous, polished tubercules. 

 Middorsum of these and following tergites nearly smooth; dorsum of 

 paranota densely set with small ovoid tubercules. Anterior margin 

 of paranota smooth and polished, terminating laterally in a sharp 

 projecting spme; caudal margin with a row of small tubercules. 

 Poriferous paranota with three or four lateral spines; the others 

 normally with only three. Peritremata set at midlength of paranota, 

 about one diameter from the lateral margin. 



Caudad, the elevation of metatergites is less pronounced; the 

 transverse row of tubercules less conspicuous; the tubercules widely 

 spaced and usually 12 in number. Likewise the caudalmost two, 

 lateral, paranotal teeth become closer together and carried increas- 

 ingly caudad as the corners of the paranota is produced, finally 

 creating the impression of a stout, slightly incurved, apically bifid 

 spur. Middorsum of segment 19 nearly flat, finely granular. Epi- 

 proct robust, depressed, its margin forming a semicircle, with six 

 marginal setiferous tubercules ; upper surface coriaceous, with a median 

 subterminal depression. 



Anal valves nearly flat, each with an ovoid depression in the upper 

 center and a distinct quadrate basal lobe overlapping on the produced 

 lateral tips of the hypoproct. Mesial edges of valves not set oflF as 

 raised margins, but differ in texture from the remainder of the valves 

 in being smooth and polished instead of finely granular. Submarginal 

 setiferous tubercules evenly spaced at one-third and two-thirds the 

 length of the margin, the upper pair on the polished rim, the lower 

 set slight]}^ back onto the granular surface. 



Hj'poproct large, robust, sub trapezoidal; the distal edge somewhat 

 trisinuate with a slightly developed median lobe between the con- 

 vexities of the paramedian tubercules; basal margin swollen, strongly 

 produced ventrad, overlapping and concealing midventral section of 

 anal segment and in contact with that of segment 19. Laterallj^ the 

 hypoproct is produced into small triangular lappets providing fulcra 

 for the basal lobes of the anal valves. 



Prozonites and metazonites of most segments separated by a w^ell- 

 defined interzonal furrow, equally distinct around body but slightly 



