464 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxi. 



Color uniform light horn brown to whitish, usually appearing dark 

 on account of adlieient particles of earth or humus. 



Vertex evenly convex, smooth and shining, without hairs; sulcus 

 distinct; clypeus sparsely hirsute; antenna' sparsely hirsute, the hairs 

 of the distal Joints shorter and more numerous than those of the 

 proximal. 



First segment trapezoidal, anterior margin transverse, medianly 

 slightly and very broadly emarginate, lateral corners somewhat rounded ; 

 lateral margins slightly curved, converging, jiosterior margin trans- 

 verse, somewhat over half as broad as tlie anterior; the segment is 

 over twice as broad as long; with the exception of a tine marginal 

 raised rim its surface is smooth and even. 



Second segment subcrescentic, the carina- rather straight, and nar- 

 rowly and acutely triangular; anterior and i)Osterior margins of mid- 

 dle part of segment transverse; the carina- project downward and 

 forward so as to slightly exceed the anterior margin of the first seg- 

 ment, which is thus entirely included between them; margins of carinae 

 with tine raised rims. Surface of segment smooth and even. 



Third segment saddle-shaped, much larger than any of the others. 

 The carinas are consi)icuously broader than those of the other segments, 

 and slightly broader than the dorsal i)art of the segment itself. They 

 are rather strongly falcate, being somewhat prominent and arcuate in 

 front aiul broadly emarginate behind. The posterior corner is somewhat 

 produced. The carina- also extend vertically much below a line drawn 

 across the points of those of the second and fourth segments. Margins 

 of carinas with a distinct raised rim. Surface of segment smooth and 

 even. 



Fourth segment with carina- conspicuously smaller than those of the 

 third, and triangular, like those of the following segments. They are, 

 however, broader and i)roduced somewhat farther ventrad than those 

 of the tifth segment. The surface is distinctly more convex on its 

 posterior part than with the preceding, and has traces of the promi- 

 nences conspicuous on the other segments. 



Segments dorsally finely and rather sparsely granular hispid, so that 

 the animals are usually more or less covered with a layer of adherent 

 particles of earth or rotten vegetable matter, which serves in life to 

 render them very inconspicuous. Segments from the fourth to the 

 penultimate have a transverse crest, usually of twelve rounded, broadly 

 subconic prominences arranged in a row, except that the one on each 

 side of the middle pair is somewhat smaller than those between which 

 it stands and is slightly in front of them. With this exception the 

 dorsal prominences are larger than those farther down; on posterior 

 segments they become more sharply acute. 



Carinic of anterior segments from the fifth to the tenth rather nar- 

 rowly triangular, their sides converging to a rounded point; from the 

 middle of the body the carinit- are increasingly broader and more dis- 



