147 
The following comparative description of the larva of the coldsmith 
beetle is quoted from Prof. Packard: 
J. 
Larva. (Plate VII, Fig. 5.) “The larva is a whitish erub, about 
one inch and three quarters long and over half an inch thick, with 
a yellowish browa scale on the part corresponding to the thorax. 
It so nearly resembles the young of the May beetle that it requires 
a close examination to tell them apart. The proportions of the two 
are much the same; if anything, the Cotalpa is slightly shorter and 
thicker, and its boly is Goverel with short stiff hair, especially at 
the end, wiile in the May beetle the haus are much finer, sparse, 
and the skin is consequently shiny. They also differ in the head, 
it being fujler, more rounded in Cotalpa, the clypeus shorter and 
very convex, while in the May beetle it is flattened. The upper lp 
(labrum) is in Cotalpa longer, more rounded in front and narrower 
at the base, and full convex on the surface, while in the young May 
beetle it is flat. The antenne are larger and longer in the goldsmith 
beetle, the second joint a little over half as long as the third, while 
in the May beetle grub if is nearly three- quarters as long; the third 
joint is much longer than in the latter grab, while the fourth and 
fifth are of the same relative leneth as in the M: ay beetle, but much 
thicker. The jaws (mandibles) are much alike in both, but not quite 
so acute in the Cotalpa as in the other, nor are the inner teeth so 
prominent. The maxilla is much longer and with stoufer spines, 
and the palpi are longer and slenderer in the grub of Cotalpa than 
in the other, though the joints have the same relative proportions in 
each; the. basal joint is nearly twice as long as in the May beetle 
The under lip (labium) is throughout much longer, and the palpi, 
though two-jointed in each, are much longer and slendererin the grub 
of Cotalpa than in that of the May beetle. 
The feet are much larger and more hairy in the Cofalpa. Both 
‘ =) © 
larve are about an inch and a half long, and a third (.35) of an 
inch thick at the widest part.” 
The eges are said by Dr. Lockwood of New Jersey to be one-tenth 
of an inch in length, waxy-white, and semi-translucent, long ovoid 
in form, and perfectly symmetrical. 
The life history of this species was unknown until determined by 
Dr. Lockwood in 1869. The following summarized account of it is 
condensed from his article published in the American Naturalist 
for that year (pages 186-192, aud 441-442). The beetles, as eee 
stated, appear in May or June, pair in the latter month, and d 
posit their eggs almost immediately. Those observed hatched in 
tweaty-seven days, but the ordinary period is probably about three 
weeks. The young larve were one-third of an inch in Jength, by 
one-tenth of an inch in thickness, dull white, wiih dull yellow 
heads and legs, and the contents of the extremity of the abdomen 
showing dark through the transparent skin. They fed and flourished 
upon the roots of clover and grass. ‘l'heir life history is apparently 
identical with that of the ordinary white grub, although its details 
cannot be made out with certainty. The transformations observed 
were completed in the earth in autumn, the beetles not emerging 
from the ground, however, until the following May. 
