216 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Cephalic plate much longer than wide (ratio about 4:29) narrowest 
cephalad; a little constricted in front of region where frontal suture 
would be if present, between which level and the caudal corners the 
sides are substraight or only very slightly convex; hairs sparse and 
mostly short or very short. Frontal plate not discrete. (Plate 6, 
fig. 1). 
Antennae short, being only 1.9 longer than the cephalic plate; 
attenuated. Articles mostly short, decreasing in size distad, those 
between the fifth and the ultimate being especially short; ultimate 
article longer than the two preceding taken together. Hairs on the 
first four or five articles moderate in length, sparse, those of the 
more distal articles considerably shorter and more dense. (Plate 6, 
fig. 1). 7 
Basal plate trapeziform as usual; much overlapped by the cephalic 
plate as also by the first succeeding tergite. Exposed portion very 
short, at the median line being but one eighth as long as the cephalic 
plate and being about 4.5 or 4.6 times wider than long. (Plate 6, 
fig.1,/2). 
Clypeal region without any porose area; areolae distinct and uni- 
form excepting for a median area on the anterior portion in which the 
areolae are conspicuously reduced in size and on which four hairs are 
borne, the clypeal region being elsewhere glabrous. 
Median piece of labrum rather large, triangular, bearing along the 
free margin five large acute and strongly chitinized teeth; lateral 
pieces with a fringe or more numerous slender spinescent processes. 
(Plate 6, fig. 4). : 
First maxillae bearing ectally on each side one moderately long 
membranous lappet. Coxosternum mesally incised, but the coxae 
well fused for most of length of contact. (Plate 6, fig. 5). 
Coxae of second maxillae almost completely separated, there being 
only caudally a pale membranous connecting bridge. Pleurosternal 
sutures strongly developed. Coxa not at all produced at mesodistal 
angle. Femur and tibia bearing at distoectal angles a distinct, acute, 
well chitinized process, that of the tibia being somewhat more dorsal 
in position than that of the femur. Claw large and simple. (Plate 6, 
fig. 6). 
Claws of the prehensor when closed extending much beyond the 
anterior margin of the cephalic plate; attaining the distal end of the 
second antennal article. Claw not crenulate; armed at base with a 
stout tooth which is subtruncate distally. Intermediate articles 
without trace of teeth, but the femur bearing on mesal side toward 
