MORSE: ORTHOPTERA OF NEW ENGLAND. 
219 
the inner angles of the post-genae and termed the suh-mentum, 
which in turn bears distally a complicated structure, the men- 
tum. The mentum bears, on a pair of lateral protuberances 
{palpigers) , the three-jointed labial palps (singular palpus, plural 
palpi) and distally a pair of semicircular paraglossae. In the 
deep median cleft between these latter is a pair of tiny glossae 
(singular glossa). Attached basally to the inner (front) side of 
the labium is a thick, fleshy tongue (hypopharynx) . 
Between the labium and the mandibles lies a pair of accessory 
jaws, the maxillae, of complicated structure, whose function is to 
handle the food rather than grind it. Each maxilla is composed 
principal sulcus 
metazone 
protons 
prosternum 
Proaotum 
10 
Fig. 10. — Side view 
of pronotum of Locust. 
Enlarged. (Original.) 
11 
Fig. 11. — Side view 
of meso- and meta- 
thorax of Locust. En- 
larged. (Original.) 
12 
Fig. 12.— Ventral 
view of thorax of 
Locust. Enlarged. 
(Original.) 
of a basal segment (cardo) which supports distally a quadrate 
sclerite (stipes); this in turn bears a triangular, black-toothed 
inner lobe (Jacinia), and laterally a small basal sclerite (palpifer) 
bearing laterally the long five-segmented maxillary palpus, and 
distally a narrow suh-galea (attached also to the stipes) which 
supports at its end the broad outer lobe or galea. When closed, 
the labrum, galeae, and paraglossae completely hide the tips of 
the mandibles and lacinia'e. Both the labial and the maxillary 
palps have at the tip a cushion-like area bearing many sensory 
papillae, probably organs of taste. 
Thorax. 
The thorax (Figs. 10, 11, 12) consists of three parts or segments: 
an anterior prothorax bearing ventrally the first pair of legs; this 
