THE MOUTH -PARTS OF SOME BEETLE LARVAE. 
391 
Ateuchus semi pane tat us, and designates them “para- 
glossae.'” 
As in the Dascillus larva, the labium is situated behind the 
ventral head-sclerite, in front of which is the base of the hypo- 
pharynx (see Text-figs. 2, a, b, 3). The definite suture 
(Text-fig. 4, s) between the labium and hypopharynx is an 
interesting feature in this larva. In the other larvse which 
we have studied, the fusion between the tips of labium and 
hypopharynx is so intimate that no boundary can be traced 
between the two structures. 
Phyllopertha. 
La brum. (PI. 37, fig. 25.) 
As in Dascillus and Geotrupes, the labrum of this larva is 
asymmetrical. The ventral surface is beset with spines. 
Posteriorly the labrum is strengthened by three transverse 
posterior sclerites (p. scl.). Just anterior to these sclerites, 
near the middle line, is a bunch of five spines. A curious 
little lobe bearing three teeth (£. x ) occurs near the anterior 
border, to the right of the middle line. This little lobe prob- 
ably corresponds to the two teeth on the labrum of Dascillus 
(PL 36, fig. 19 1 1 ), which so definitely mark its asymmetry. 
The labrum of this larva is not so densely chitiuised as 
that of Dascillus. 
Maxillula; and Hypopharynx. (PI. 37, figs. 26-28.) 
The shape and position of the tongue recall the condition 
in the Dascillus larva. The lateral sclerites are rather inti- 
mately connected with the large tendons of the adductor 
muscles of the mandibles. 
The hypopharynx is strongly chitiuised and very asym- 
metrical. As in Dascillus and Geotrupes, it consists of an 
anterior boss of transparent cuticle,- a very strongly chitinised 
middle region, and a posterior basilar membrane, which turns 
back dorsally to meet the epipharynx. 
The anterior boss is beset with spines and very intimately 
