157 
bases of the mandibles. ‘The joints are short and quadrate, the 
first and the fourth about equal to the third. The epistoma is 
transverse, about three times as wide as long, narrowing rapidly 
forward, the anterior margin concave for the reception of the labrum 
(Fig. 4, D). The mandibles (Fig. 4, C) are curved, rather narrow, 
the width being about two-thirds the length, and comparatively 
broad and obtuse at tip, where they are more or less clearly emar- 
ginate or sometimes trifid. Externally each bears two strong 
slender hairs at the base. 
The cardinal piece of the maxilla is not distinct from the basal. 
The maxillary lobe (Fig. 4, B, c) is about two-thirds as broad as 
long, rounded at the tip, and provided with about ten spines of 
varying length along the inner margin, the two basal of which are 
very strong, and about half the length of the lobe. This last reaches 
only a little beyond the third jomt of the palpus. The palpi (d) 
are four-jointed, the first joint broad, imperfectly separated within, 
the second shorter, the third about as long as the first and second 
poetner, the fourth narrow, cylindrical, and ‘one-half the length of 
the third. 
The labrum (a) is thick and fleshy, nearly semi-circular in outline, 
the palpigerous tubercle scarcely evident; the palpi (b) unarticulate, 
cylindrical, narrowed distally, and about as long as the third joint 
of the maxillary palpus. The ligula is fleshy, broad, and bilobed. 
The tubercles at the ends of the ventral ridges project downwards 
beyond the general ventral surface (Plate IX, Fig. 4, HK, a and b), 
each bearing about ten hairs of varying lengths, the three or four 
longest being longer and stronger than any others on the larva. 
The hairs on the median part of the ventral ridges form an unbroken 
row, about nine in number, alternately longer and shorter, with many 
very short ones intermingled. The longest of these hairs are as 
long as the corresponding segments. 
Adult.—(Plate VIII, Fig. 4). In the genus Colaspis the anterior 
margin of the thorax is straight beneath, not projecting in the form 
of lobes behind the eyes, and the head is destitute of supraocular 
grooves. The thorax is margined at the base, and the second joint 
of the antenne is shorter than the third. 
The species Colaspis brunnea is entirely ochreous or testaceous ; 
head sparingly punctate; antennal tubercles smooth, coppery; eyes 
emarginate; thorax rather transverse, sides broadly rounded, re- 
flexed, somewhat explanate; base rounded, thickly and deeply (disk 
more sparingly) punctate; elytra with eight smooth sub-costate inter- 
stices, the punctures between them sometimes uniseriate, and at 
others irregular or triseriate; thoracic epipleure punctate. In variety 
costipennis the head and thorax are metallic green; elytra brown, 
with four yellow costate interstices. Every lead can be found 
between these extremes. 
LIFE HISTORY. 
The adult beetle is said by Fitch to appear in the latter part of 
June, continuing through the month of July. Prof. Riley, in his 
Third Missouri Report, says that the larva commences .to pupate in 
