206 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
as is so characteristic of brevilabiatus. Basal and cephalic plates deep 
ferruginous; prosternum and prehensors ventrally similar but paler, 
the claws black. Antennae like cephalic plate but pale at their very 
tips. Venter pale testaceous, darker cephalad. Legs similar to venter. 
Body large and robust; strongly attenuated both cephalad and 
caudad. Hairs of body very fine and short as are also the few hairs 
of the legs. 
Cephalic plate conspicuously wider than long, the ratio being about 
48:39. Widest caudad, where the sides are convex; moderately 
converging anteriorly in front of the middle to the anterior corners; 
lateral portions of anterior margin converging from the anterolateral 
corners to an obtuse angle at the middle; caudal margin widely, 
weakly convex. Plate with subdense, uniform, fine punctae. Hairs 
very fine and short, numerous. 
First maxillae with inner division sharply set off; short and broad, 
apically rounded, not membranous. Outer division with the second 
and third articles not separated by a suture; short and thick; slightly 
membranous at tip on mesal side; membranous lappets of moderate 
length, the distal one wide and rather dorsal in position. Coxae of 
the second maxillae broadly joined at middle; with the usual oval 
opening toward the caudal end of each side. Claw of palpus rather 
small, bearing along each edge a fringe of about nine or ten spines. 
Antennae very short, being but 1.68 times the length of the cephalic 
plate. Flattened; very wide at base, then strongly narrowed, espe- 
cially distad of about the proximal fourth. Proximal articles very 
short, much wider than long, the more distal ones relatively longer; 
the ultimate article not much differing in length from that of the two 
preceding ones taken together. Hairs very fine and short, dense 
distad, becoming less so proximad. 
Prebasal plate not exposed. 
Basal plate embracing the cephalic. Very wide, with sides convex 
and not strongly converging cephalad; nearly one half as long as the 
cephalic plate (ratio about 2.1: 1), and very nearly three times as wide 
as long; finely and subdensely punctate like the head. Hairs similar 
to those of the head but considerably fewer in number. 
Claws of the prehensors when closed very nearly but not wholly 
attaining the front margin of the cephalic plate; all joints unarmed; 
claws stout. 
Prosternum much wider than long, the ratio of width to length 
being 2.25-2.3:1; longer than the outer height of femur in ratio 
25:14; subdensely punctate as are also the proximal articles of the 
prehensors. (Plate 5, fig. 5). , 
