400 NEW YORK STATE MUSEUM 



one 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.lf/] is somewhat quadrangular in shape, aud is 

 provided at its cephalic end with six setae, the median pair 

 being quite small. The lateral sclerites [fig.l and 2/)] are nearly 

 hemispherical, with a email 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 tlaplike 

 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 nid, 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. Also 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.o] two 

 slender setae ma^^ be observed near the lateral margin. 



The maxillae [flg.5?»^"] 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 [mae, 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 is visible. It may in 

 fact, be a cephalic prolongation of the lateral sclerite of the 

 head. The labium [fig.o/] is immovably joined to the ventral 

 sclerite of the head, no separating suture being visible. Its 

 cephalic margin has about 10 stout black teeth, alternating long 

 and short. 



