576 Wisconsin Academy of Sciences, Arts, and Letters. 
membrane, or whether it is part of the labrum, would be hard 
to decide. No taste-organs of any kind are apparent. 
Mandibles. These are strongly chitinized, short and com 
pact, and they present highly developed molars which have 
numerous sharp, high ridges. The galea is not toothed at the 
end but terminates in a slightly chitinous, leaf-like expansion. 
Labial structures (Fig. 71). Again we find the anterior 
and posterior plates of the sub-mentum nearly equal in size; 
the former is convex in front. The mentuin is comparatively 
large and has not been moved in very far over the sub-mentum. 
Anomala minuta Burm. (PI. XXXII, Fig. 72; PL 
XXXIII, Figs. 73-74). 
Epipharynx (Fig. 72). This organ is less reduced in 
this than in the preceding species. It is comparatively 
large and chitinous, with a fringe of bristle-like hairs along 
its frontal and lateral edges. A few sense-papillae are pres¬ 
ent, arranged in a triangular shape; they are bounded by the 
characteristic lateral row of hairs. I am inclined to believe 
from their position and appearance that these papillae, here 
as in other species, are gustatory in function. 
The mandibles (Fig. 73) and the maxillae are similar in 
appearance to those of Diplotaxis and need not be discussed. 
Labial structures (Fig. 74). In Anomala the anterior 
plate of the sub-mentum is large, the posterior plate compara'- 
tively small and transverse. The mentum is large and is 
pushed in over the sub-mentum to a considerable extent. Its 
posterior margin is convex, its anterior edge slightly concave 
with the lateral angles rounded. It is wider than the ante¬ 
rior part of the sub-mentum, and its front and lateral portions 
are visible from beneath, protruding over the edges of the sub- 
mentum. As usual, no hypopliarynx is present. 
Pelidnota punctata Linn. (PI. XXXIII, Figs. 75-76; PI. 
XXXIV, Fig. 8). 
Epipharynx (Fig. 75). This is for the greater part 
membranous, its anterior edge only being chitinized. It 
is strongly indented in front, and its lateral portions are 
