166 Annals Entomological Society of America  [Vol. V, 
Head finely roughened or rugose; free from hairs excepting the usual 
ones in clypeal and labral region and a single long median bristle at 
anterior end of the distinct median sulcus of vertex. A deep furrow 
extends from mesal angle of each eye to that of the other, the furrow 
angularly bent caudad mesally, the longitudinal median sulcus of vertex 
meeting this angle; farther forward a second transverse furrow, in front 
of which the head appears to bulge in a low transverse ridge. 
Eyes large, triangular, its sides a little convex, one angle mesal and 
another immediately above base of antennze. Ocelli about 39, arranged 
in seven transverse and gently curving series; thus, 8, 8, 7, 6, 5, 3, 2. 
Antenne moderate; proximal joints slender; distad thickened, 
clavate, as usual. 
First dorsal plate large; mesal length about equalling that of two. 
succeeding segments together. Anterior margin evenly convex; 
cephalo-lateral corners strongly rounded, the caudo-lateral more angular. 
Margined laterally and at sides cephalically, but not so the median 
portion; caudal border not margined. Not striate on sides below. A 
fine median longitudinal impressed line extending from caudal margin 
cephalad about three-fourths of the length of plate, at its anterior end 
breaking into two lines which diverge cephalad and become indistinct. 
All subsequent segments striate beneath and over lower portion of 
sides, the stria deep. 
Anal scutum rounded caudad, mesally weakly indentate, a slight 
tooth each side of indentation; smooth. 
Anal valves smooth, the mesal margin but wealky and narrowly 
elevate. 4 
Anal scale with caudal margin convex, the cephalic more strongly so, 
the two meeting at an angle on each side. A pair of caudally projecting 
bristles inserted a little in front of caudal edge. 
Mandibular stipes considerably produced below, mesally excavated. 
Gnathochilarium with the enlarged promentum narrowly elliptical 
or rather wider distad than proximad as shown in figure; relatively 
narrower than in most species. (See Pl. XI, fig. 8). 
First legs of male strongly enlarged and uncinate in the usual way; 
mesal surface complanate and strongly tuberculate, the tubercles in 
distinct cross series. Caudal surface glabrous, long hairs on the an- 
terior. 
Second legs with the greatly enlarged coxe fitting closely against 
bases of first legs and bent cephalad between the latter; other joints 
greatly reduced the ultimate densely clothed with short stiff hairs, 
those at apex longer. 
Gonopods of male large and conspicuously exposed. Anterior pair 
with two main branches, the outer of which is flattened ect-mesally, of 
nearly uniform width, distally rounded, clothed with long bristles on 
mesal side; the inner branch also flattened or plate-hke, bent cephalad 
and, as seen from ventro-caudal aspect, appearing expanded at free end 
into a foot-like shape with the toe mesal and the heel ectal 1n position. 
Each of the posterior gonopods enclosed or embraced at base on ectal 
side with a low plate the extended ends of which bend about it in front 
