HEAD, MOUTH-PARTS, ORTHOPTERA EUPLEXOPTERA 267 



116), Stenopelmatus (figs. 101, 109, and 111), and Anisolabis the 

 subcardo extends along the caudal and dorsal margins of the 

 alacardo. In Gryllus (figs. 99, 102, and 103), Orchelimum (figs. 

 105, 107, and 108), Melanoplus (figs. 112, 113, and 114), and 

 Tettix (figs. 117, 118, and 119) the subcardo is deeply emargin- 

 ate and surrounds the alacardo on the ventral, caudal, and 

 dorsal aspects. In these genera the suture between the two 

 segments is obliterated, probably due to the irregularity pro- 

 duced by the complicated parademes. In Diapheromera and 

 Melanoplus the exparartis is entire and in other genera it is 

 shallowly or broadly bifurcate. 



The stipes, except in Anisolabis, is subquadrate and chitinized 

 on the ventral aspect; on the dorsal aspect the chitinous area is 

 small and triangular, and the remainder of the surface is mem- 

 branous or submembranous. In Anisolabis the stipes is divided 

 into two parts, the proximal of which is small and triangular 

 and located on the ventrolateral aspect, the distal is triangular 

 and located on the ventral aspect. They are separated on the 

 ventral aspect by the encroachment of the greatly enlarged sub- 

 galea (fig. 94, sg) and on the dorsal aspect by the elongated 

 palpifer (fig. 93, pf); the two parts are connected by a narrow 

 membranous area. 



The subgalea is always present, is narrow, and extends longi- 

 tudinally, except in Anisolabis where it is very large, flat, sub- 

 pentagonal, and occupies the greater part of the ventral sur- 

 face. It extends along the entire mesal margin of the stipes in 

 Mantis, Gryllus, Stenopelmatus, and Anisolabis. In the others 

 it does not quite reach the cephalic margin of the stipes. The 

 suture between the stipes and subgalea is distinct except in 

 Mantis, where a furrow marks the line of fusion of the two 

 sclerit-es and its ental surface is thickened. 



The palpifer is uniformly present and in Mantis and Dia- 

 pheromera it is very indistinctly separated from the stipes. It 

 is distinct, although on the dorsal aspect it is submembranous 

 and its boundary is more or less obliterated, except in Anisolabis, 

 as already noted. In Melanoplus it is confined to the ventral 

 aspect. 



