942 On the Genealogy of the Insects. [September, 
cannot understand the following remarks. See also this journal 
XVII, p. 790.) 
It appears, then, that the first larva, or triungulin, in form 
resembles the Campodea-like, primitive larval form of Coleop- 
tera; the Epicauta triungulin closely resembles a Carabid larva, 
the head, antenne and mouth-parts, as well as the legs and form 
of the body in general, being on the primitive, Carabid type 
(somewhat like Casnonia (?), Galerita and Harpalus); the second 
larva, or Caraboid stage, though quite different as regards the 
mouth-parts, and with a smaller head, thicker body and much 
shorter legs, still adheres to the higher Carabid form (Carabus 
and allies), During the Scarabzoid stage the larva rests nearly 
motionless in the egg of the locust, and is like the curved clumsy 
larve of the cockchafer or June beetle and other Lamellicorm 
larvee, which also have the similar habits of lying still in their 
burrows and feeding on the roots of grass, or, as in the case of 
Osmoderma, lying nearly motionless in their cells in rotten” 
wood. This sort of life going on, the larval blister beetle after 
six or seven days assumes the fourth larval stage, and now, 
from apparent continued disuse, the mouth-parts and legs he- 
come more aborted than before, and the insect in this stage 
may be compared to some Longicorn larve, with a general re- : 
semblance in the curved, cylindrical body to the Ptinid and 
Chrysomelid, and it even approximates in general shape Cane 
lionid larve. In the pseudo-pupa or coarctate larva this prey = 
of disuse and obsolescence of parts culminates in the immovl® — 
stage preceding the pupal condition. We thus see that 10 m 
life-history of a single species of beetle, change in the habits 
environment, as well as in the food, is the cause of a change os : 
the form of the body ; and this series of changes in the M which : 
typifies the successive steps in the degradation of form ' on ; ; 
characterizes the series of Coleopterous larve from the ee 
down to the Curculionide and Scolytida. At first all larve We 
carnivorous and active in their habits, with large mandibles a 
well developed accessory jaws and legs; certain forms the me 
coming scavengers, their appendages became, from parr 
developed; then others, becoming phytophagous, bea 4 
some cases still less developed, the jaws shorter am ee 
with corresponding modifications in the other mouth a pw 
antennz and the legs, while the body became thick, fat ai ~~ 
