Patton.] , 398 [January 21, 
In Philanthus the clypeus is broad, and in the middle extends | 
upwards towards the middle of the face, producing a three-lobed 
form; the median portion is narrowed above, and squarely cut off 
from the piece which lies between the antennae. The side lobes 
which do not extend upwards, are bounded above by a transverse 
suture; and at the point at, which the suture over each of the lateral 
lobes meets the side sutures of the extended median portion, there 
is present on each side a slight pit, to which the term fovea may be 
applied. 
In Philanthus and Aphilanthops the side lobes of the clypeus do 
not touch the eyes; in some species of Eucerceris 3 they almost 
touch the eyes, and in 2 Hucerceris they do touch the eyes; in 
Cerceris 3 and @ they alwdys touch the eyes. There is here a grad- 
ual narrowing of the face and, accompanying it, we find a change 
in the form of the suture over the lateral lobes of the clypeus. In 
the females of the fulvipes and canaliculatus sections of the genus 
Eucerceris, the suture limiting the side lobes of the clypeus above 
is evenly arched, and there is a slight depression extending down- 
wards from the fovea; in the females of the zonatus section the face 
is greatly widened below, and the sutures over the side lobes are 
nearly as in Philanthus; in Eucerceris males the suture over the 
side lobes is oblique, and from/its inner end there extends down- 
ward for a short distance, between the side and middle lobes, a con- 
tinuation of the suture. In both sexes of Cerceris the form of the 
sutures is similar to that in the males of Eucerceris. With the nar- 
rowing of the face the side lobes of the clypeus have pressed up- 
wards, the limiting suture, at first straight, has become arched, and 
finally, its inner portion has been pressed against the sides of the 
median lobe, the fovea driven upwards, and a suture produced indi- 
cating the line in which the side lobe is pressed against the median 
lobe. In some species of Cerceris the process is carried still further; 
“in C. compar, C. mandibularis, etc., the side lobes take an orbicu- 
lar form, and in C. venator they become higher than broad. The 
suture extending downwards from the fovea in Cerceris, and Eucer- 
ceris, together with the sutures extending from the fovea to the base 
of the mandibles may be termed the foveal sutures. It is worthy of 
note that they never extend below a point corresponding to the 
position of the fovea in Philanthus. 
It will be observed that this account of the clypeus is very differ- 
ent from that given by Dr. A. S. Packard, Jr., (Proc. Ent. Soc. 
