66 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I37 



in shape, and the frontoclypeal region slopes downward and rearward 

 to the labrum. The frontal costa is broad around the median ocellus, 

 narrowing upward to the vertex and becoming indistinct down from 

 the subantennal suture (fig. 2, ;'). The frontal carinae (i) consequently 

 are well marked on the upper part of the head from the vertex to the 

 subantennal suture, where they disappear. 



The eyes and ocelli. — The ocelli (fig. 2, O) are rather large. The 

 compound eyes (E) are relatively small, globose, prominent, and situ- 



FiG. I. — MarclUa rciiiipcs Uvarov, female, dorsal view. 

 A, tnacropterous form. B, brachypterous form. 



ated on the upper lateral regions of the head. Phytophilous grass- 

 hoppers in general show larger compound eyes, more elongated toward 

 the genal region of the head, and usually not so prominent as in 

 Marellia. The form and situation of the compound eyes again recall 

 the geophilous Ommexechidae, in which they are globose and simi- 

 larly situated on the upper part of the head. 



The antennae. — The antennae (fig. 2 A, Ant) are relatively short, 

 with a scape and pedicel well differentiated. The diameter of the 

 flagellum slightly increases from its insertion on the pedicel to the 

 apical segment. 



