— 49 — 



THE MOVABLE PARTS OF THE HEAD. 



Antennae. — The antenna are filiform, and n-segmented ; 

 the third segment is the longest one. The proximal , three 

 segments are glabrous, and the second and third bear each 

 two or three longish hairs near their distal end. The re- 

 maining eight segments are finely pubescent. In addition 

 each of these eight bears a few longer hairs at its distal end. 



Mouth-Parts. 



The mout/i-parts are fitted for biting and are in general 

 similar to the mouth-parts of the locust. 



Labrum. — The labrum is conspicuous, with the distal mar- 

 gin slightly concave outwardly ; along this margin there are a 

 few, rather long hairs. 



Mandibles. — The mandibles are rather long, and taper 

 distad to a sharp, curving tooth. They bear on their sharp, 

 cutting, inner margin, near the base, a few, small, blunt 

 teeth, and their outer face presents a broad, shallow groove 

 or furrow called the mandibular scrobe. Make a drawing of 

 a mandible. 



Maxillae.— The maxilla differ especially from those of 

 the locust by the presence of an additional sclerite, the sub- 

 galea, by the side of the stipes, as if the stipes were divided 

 by a longitudinal suture. The cardo is large, and broadly 

 club-shaped ; the median portion of the maxilla is composed 

 of three sclerites, the stipes, palpiger and subgalea. These 

 three sclerites may be distinguished when the maxilla is 

 viewed from the ' dorsal aspect by the following characters : 

 the palpiger lies above the distal two-thirds of the stipes, 

 and also overlaps part of the subgalea. It is elongate, sub- 

 triangular in outline with apex directed toward the maxilla. 

 From it arises the four-segmented palpus, and it also bears 

 near the origin of the palpus a single, conspicuous, long 



