268 HACHIRO YUASA 



The lacinia is hook-shaped, depressed, chitinized, and dentate 

 in all; its surfaces and the mesal margin are convex. In Mantis, 

 Gryllus, Orchelimum, and Stenopelmatus, the lateral half of the 

 proximal part of the lacinia is concave on the dorsal aspect. 

 In Melanoplus and Tettix, the mesoproximal angle is pro- 

 duced into a cone-shaped elevation. The suture between the 

 lacinia and the stipes is obsolete on the dorsal aspect, but dis- 

 tinct and complete on the ventral aspect in all except Mantis, 

 where it is interrupted, and Melanoplus, where it is represented 

 by a furrow. An oblique suture on the ventral aspect of the 

 stipes extends caudolaterad from the mesodistal angle in Gryllus, 

 Orchelimum, and Anisolabis, and a mere indication of it occurs 

 in Stenopelmatus and Tettix. Directed caudolaterad from the 

 lateroproximal corner of the lacinia, there is another suture in 

 Mantis, Gryllus, Orchelimum, and Melanoplus and slightly indi- 

 cated in Diapheromera. The maxadentes are two in number, 

 except in Melanoplus, which has three, and Tettix (fig. 990 

 which has four, arranged in a transverse row. In Diapheromera, 

 the single dens may be a product of fusion of two or three 

 dentes. There is a non-dentate hamadens (h) on the mesal 

 margin near the maxadentes in Gryllus, Orchelimum, and 

 Stenopelmatus. The lacinarastrae are distinctly developed in all 

 except Melanoplus and Tettix. In these genera, however, there 

 are a number of long distinct setae (rs) on the mesal and ventral 

 aspects. They are small and few in number in Diapheromera. 



The galea is always two-segmented, and the suture between 

 the segments is distinct on the ventral aspect. This suture, in 

 Diapheromera and Orchelimum, is obsolete on the dorsal aspect. 

 The proxagalea is short, transverse, and subcylindrical in Gryllus, 

 Orchelimum, Stenopelmatus, and Anisolabis; is short and deeply 

 concave on the mesal aspect in Mantis, and flattened, mem- 

 branous, and slightly concave on the mesal haK of the dorsal 

 aspect in Melanoplus and Tettix, with the distal part dilated in 

 the former and obtusely pointed in the latter. The distal end 

 of the galea, except in Melanoplus, is membranous and pro- 

 vided with minute setae. The suture between the stipes and 

 the proxagalea is obsolete on the ventral aspect in Mantis, Dia- 



