THE WATER-CRESS LEAF-BEETLE. 
17 
narrowed anteriorly and the apex margined. The elytra have eight 
punctate striae, with a short subsutural and submarginal row of 
punctures. The third joint of the tarsi is emarginate apical ly. 
The present species measures a scant one-eighth of an inch in 
length (3 mm.), is shining bronzy black, and has the elytral intervals 
apparently smooth, but in reality faintly rugulose when highly mag- 
nified, while the thorax is microscopically reticulate. The original 
description appeared in 1858. a 
The egg. — The eggs have not come under observation. They prob- 
ably resemble those of the European Ph. armoraci(B L., described by 
Fryer as " elongated oval and of a dark orange color." 
Fig. 5. 
-The water-cress leaf-beetle (Phcedon ceruginosa) : a, adult; b, larva, from above; 
c, same, from side; d, pupa. Enlarged twelve times (original). 
The larva. — The larva appears somewhat like that of a related 
genus, Galerucella, only that it is very much smaller. It is about 
three or four times as long as wide, depending upon whether it 
is somewhat contracted or fully extended. The head is subtruncate 
in front, with the antennae lateral (in preserved specimens). The 
head is shining black, and the remainder of the body very dark brown 
or brownish black relieved by lighter areas between the segment-. 
The first thoracic segment is a little wider than the head: the 
ond considerably wider than that, and the third widest, being nearly 
as wide as the first two abdominal segments. The second abdominal 
is widest, and at the same time the widest part of the body. The 
surface is sparsely covered with long hairs placed on piliferous tu- 
bercles, which are arranged some distance apart, as shown in figure 
5, b. The tubercles on the sides of the dorsum are sometime- very 
prominent, and the larva is able to extend these, possibly, at will. 
From the abdominal segments large tubercular sections bearing hairs 
at their summit extend on each side. The anal segment is pale, like 
the ventral surface, which bears dark piliferous tubercles. Length, 
5 mm.; width, 1.2-1.5 mm. 
a Knt. Zeitung, Stettin, Vol. \i\. pp. 395, :»!»<;. L85& 
