THE MOUTH-PARTS OF SOME BEETLE LARViE. 
381 
The galea and lacinia are covered over by a delicate cuticle, 
so that they appear to move as one process. 
Labium. (PI. 35, fig. 11.) 
The labium is very broad, projects somewhat in front of 
the head, and covers up the other jaws, except the maxillae, 
which are somewhat displaced laterally, and protrude from 
beneath it. 
It consists of a basal piece or submentum (sm.), which is 
ridged and bears a few spines along the ridge, and a large 
broad mentum ( mt .), which carries two stumpy two-segmented 
palps (Lb. Pip). The margin of the mentum bears numerous 
spines. 
The Larva of Dascillus cervinus. 
The specimens examined came from Clondalkin, Co. Dublin. 
The larva is about four times as long as broad, with a large 
and very broad head region. The stout mandibles project 
beyond the curiously asymmetrical labrum. The antenna is 
rather short and four-segmented — thus offering a strong 
contrast to the exceedingly long antenna characteristic of the 
allied genus Helodes. General figures of this larva occur in 
the papers of Boas (*96), Gahan (’08), and Carpenter (’09), 
while the larva of an American species of Dascillus has been 
described by Rivers (’91). The skeleton is very strongly 
ehitinised — the jaws forming powerful biting and grinding 
organs. 
Labrum. (PI. 36, fig. 19.) 
The labrum is very asymmetrical — in this respect differing 
from that of Helodes and agreeing with the labrum in 
Geotrupesand Phyllopertlia, described below. It is somewhat 
quadrilateral in shape ; its anterior margin carries short, 
stout spines. 
The asymmetry apparent on its dorsal aspect is still more 
evident ventrally when the epipharynx is displayed. In the 
