460 NEW YORK STATE MUSEUM 
cne very short one at the base. Of the longer spines one is 
somewhat longer than the other two. The dorsal sclerite of 
the head [fig.1Jd] is somewhat quadrangular in shape, and is 
provided at its cephalic end with six setae, the median pair 
being quite small. The lateral sclerites [fig.1 and 2b] are nearly 
hemispherical, with a small black pigment spot on the dorsal 
surface near the anterior margin; just cephalad of this is a 
stout seta, laterad of it is a long slender one, and mesad of it 
a small irregular area of ommatidia. On the middle of each 
lateral sclerite, arranged in a single transverse row, are about 
12 stout spines projecting cephalad, and immediately in front 
of this row are two or three long slender setae. At the base 
of each antenna on the frontal sclerite is another seta. 
The labrum is a transversely oval piece [fig.4] which is at- 
tached at the cephalic margin of the head and hangs flaplike 
downward and backward over the mouth; its free end provided 
with two curved, pale yellow spines, between which are several 
rows of flattened, short, yellow, forked spines. At the base of 
the labrum are two pairs of rather long, curved setae, and on the 
center are two pairs of very short, delicate ones. 
The mandibles [fig.2 md, 5 md, and 6] move in a horizontal 
plane and when folded down are visible only from the ventral 
aspect. On the inner (mesal) margin near the apical end is a 
row of seven stout black teeth; on the dorsoapical margin are 
two stout flattened spines, which, when the long axis: of the 
mandible is parallel to the body, projects mesad nearly at right 
angles to the long axis of the body. AJso on the dorsal surface, 
a little apicad of the middle are two unequal long and very 
stout setae; and proximad of these are seven long and one 
short lanceolate spine attached to a small crescent-shaped 
basal piece. When viewed from the ventral surface [fig.5] two 
slender setae may be observed near the lateral margin. 
The maxillae [fig.5ma] are two lobed. One is of irregular 
Shape, about as long as wide, articulated at its base, with a 
seta at the apex, and having a small palpus with three or four 
pointed processes a little laterad of this seta. On the mesal 
margin are a number of long stout, setae, and long slender 
hairs. The second lobe [ma#, i], ventrad and mesad of the first, 
is elongate with a stout seta on the anterior mesal margin. No 
suture between it and the head sclerite ig visible. It may in 
fact, be a cephalic prolongation of the lateral sclerite of the 
head. The labium [fig.5/] is immovably joined to the ventral 
sclerite of the head, no separating suture being visible. Its 
cephalic margin has about 16 stout black teeth, alternating long 
and short. 
