534 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
articles. First three articles moderate, the others short and very short. 
Ultimate article short, rounded, subequal to or a little shorter than the 
two preceding ones taken together. 
Ocelli in type 8 to 11 arranged in 3 or 4 series: e. g., 1+ 1, 3, 3; 
1+ 1, 3, 3,1; 1+.3, 4, 3; 1+ 1, 3, 3, 2. Singles ocellus largest, 
separated. Others not very distinct. Organ of Témésvary in out- 
line smaller than the seriate ocelli. 
Prosternum near 1.77 times wider than long. Distance between 
chitinous spots about 1.77-++ times width at level of bottom of sinus; 
only 2.2 times the dental line. Teeth 3+ 3 or 3+ 4; not much 
differing in size; line of apices on each side a little convex with 
angle between lines at middle thus reentrant. Sinus shallow, broadly 
u-shaped or subsemicircular. Spine slender and short, on a tubercle 
just ectad of outer tooth. Margin evenly convexly rounding back 
from spine to prehensor on each side. 
First dorsal plate in measured specimen 1.56 times wider than ‘lone: 
Sides between corners straight or toward middle of length a little 
incurved, only moderately converging. Posterior angles of ninth, 
eleventh, and thirteenth dorsal plates produced; the processes narrow 
and not long, those of ninth plate shortest. 
Coxal pores moderately large, somewhat transversely elongate or 
subelliptic, decreasing on each coxa proximad: 5, 4, 4, 4; 5, 5, 5, 5. 
Claw of female gonopods long, subacute, moderately curved. 
Spines 2 + 2, stout and rather short, of the usual subconical form. 
Mesal edge of first article sharp, strongly chitinized, conspicuously 
bending out ectad ae ls 
Spines of first legs, ae - = a of the second, Saaae of the third and 
fourth, 2°21. of the fifth, o**. of the sixth and seventh, TET 
? 0, 0,0, 1, 2? ? 0,0, 0, 2, 2? oe . 
of the ey ie twelfth, -- = ; a of the thirteenth, ; 7 3293 of the 
penult, Re of the anal, ne claws 2. Anal coxae laterally 
armed but the spine seemingly easily lost. The single dorsal tibial 
spine is in all cases on the anterior side. 
Segments of legs longitudinally furrowed dorsally and ventrally, 
especially on the more posterior pairs. | 
Anal legs of male not specially modified. Penult legs with the fifth 
article at distal end on mesal surface presenting a longitudinally 
placed, pilose swelling or lobe somewhat similar to but proportionately 
larger than that borne on the corresponding article in males of Guam- 
bius. 
Length 19-21 mm.; greatest width of tergites 2.25 to 2.6 mm. 
Locatity.— Mexico: Hidalgo, Guerrero Mills (W. M. Mann). 
Typr, M. C. Z., 1740; two specimens, Type and Paratype, M. C. Z. 
1752. 
