COLEOPTERA. 
509 
PP. Ventral segments free. 
Q. Prothorax loosely joined to the 
mesothorax; front coxal cavities 
entirely in the prosternum, p. 544. 
ELATERIDjE. 
QQ. Prothorax firmly joined to 
the mesothorax; front coxal cav¬ 
ities closed behind by the meso- 
sternum, p. 548.. .Throscidas. 
OO. Prosternum without a process re¬ 
ceived by the mesosternum, although 
it may be prolonged so as to meet 
the mesosternum. 
P. Posterior coxae contiguous, p.534. 
PHALACRIDiE. 
PP. Posterior coxae separated. 
Q. Body very depressed; middle 
coxal cavities not closed exter¬ 
nally by a meeting of the meso¬ 
sternum and metasternum, p. 537. 
CUCUJIDjE. 
QQ. Body more or less convex; 
middle coxal cavities entirely sur¬ 
rounded by the sterna. 
R. Prosternum not prolonged 
behind, p. 538. 
MYCETOPHAGIDiE. 
RR. Prosternum prolonged 
meeting the mesosternum. 
S. Anterior coxal cavities open 
behind, p. 538. 
CRYPTOPHAGIDjE, 
SS. Anterior coxal cavities 
closed behind, p. 536. 
ErOTYLIDjE. 
MM. Anterior coxae conical, and projecting 
prominently from the coxal cavities. 
N. Posterior coxae dilated into plates 
partially protecting the femora, at least 
at their bases. 
O. Antennae serrate or flabellate. 
p. 544 . Rhipiceridje. 
