ANATOMY OF MARELLIA REMIPES — CARBONELL 



71 



insect. Its articulation with the head comprises the usual cervical 

 sclerites (fig. 2, Cv) in the membranous wall of the neck region. 



The proterguni (fig. 6, T) has a slightly convex upper surface or 

 disc, which turns abruptly down along definite lateral lines to form the 

 ample lateral lobes. The disc of the protergum shows two well-marked 

 grooves which are continued along the lateral lobes, nearly to their 

 edges. 



The visible part of the pleural region, the prothoracic sternum, and 

 the articulation of the forelegs do not offer any peculiarity of their 

 own. The prosternum (fig. 9, ^i) lacks the spine-shaped tubercle 

 present in other grasshopper families. 



Lm 



A C 



Fig. 5. — Clypeus, labrum-epipharynx, and hypopharynx of Marc Ilia rcmipcs. 



A, clypeus and labrum, posterior view showing epipharyngeal surface. B, hypo- 

 pharynx, anterior view. C, hypopharynx, lateral view. 



Clp, clypeus ; Hs, suspensorial bar of hypopharynx ; Lm, labrum ; Tor, torma ; 

 y, oral branch of suspensorial bar of hypopharynx. 



The pterothorax. — The pterothoracic region in Marellia is, in its 

 general structure, similar to that of other described species of grass- 

 hoppers. In brachypterous and macropterous specimens some differ- 

 ences in the degree of sclerotization can be noticed in the articulation 

 of the wings and in the metathoracic tergum. In general, the axillary 

 sclerites are less well defined, and the desclerotized areas between the 

 scutum and the scutellum of the metathoracic tergum are smaller in 

 the short-winged forms. 



The tergal region of the pterothorax (fig. 7) is nearly identical 

 with that of Dissosteira Carolina as described and figured by Snod- 

 grass (1929). Among the minor differences shown, there are in the 

 lateral prescutal areas {Psc) of the mesothorax {MsT) two small, 

 spinose tubercles (SpT) of which the function is unknown to the 

 writer. As we shall see later, similarly spinose formations are visible 

 on the third axillary sclerites of both wings. 



