756 'Wisconsin Academy of Sciences , Arts , and Letters. 
Scattered over its surface are a number of slightly curved 
setae. 
The frons (fig, 1, Fr.), 1. 5mm in length and 4. 5mm at 
its greatest width, occupies ai large, somewhat rectangular 
region, extending across the front of the head.; at either side 
are the eyes above is the vertex and below it the clypeus. The 
two upper corners are rounded, the lower ones acutely angled 
with rounded apex. Dorsally there is a deep median depres¬ 
sion, in the center of this is a narrow longitudinal stripe of a 
lighter color which divides the entire frons into right and left 
halves. This dorsal depression gives to the frons, at either 
side, an inflated appearance. Slightly curved setae are also 
scattered over this region. 
The clypeus (fig. 1, Cly.) is very distinctly divided into 
anterior and posterior parts; the combined length (height) is 
1. 5mm, the width of the posterior part is 4.5mm, of the an¬ 
terior portion 3.75mm. Except in the median region there is 
a distinct boundary between the two parts. Each part is di¬ 
vided into a median and a lateral portion, the division being 
most plainly seen in the posterior region where the lateral lobes 
extend to the margin of the eyes. Setae, similar to those on 
the other parts, are also found on the clypeus. 
The occiput (fig. 4, Op.) has both a dorsal and a posterior 
surface; these are not separated in any way from each other 
but are formed by the bending of the occiput at the posterior 
margin of the head: there is thus exposed a nearly equal sur¬ 
face from each of the two views. From a dorsal view the oc¬ 
ciput has a triangular outline; the base is posterior and rounded, 
the apex is anterior, and, wedging in between the eyes, makes 
the sides of the triangle slightly concave. Posteriorly the 
occiput shows a surface about equal in area to that seen from 
above; it is also in this view somewhat triangular in outline, 
all but the dorsal surface is convex, the base more so than the 
sides. The narrow space which marks the median boundary 
of the eyes connects the apex of the occiput with the posterior 
margin of the vertex. The setae borne on the occiput are not 
so stiff as those on the other parts already mentioned. 
