98 
ORTHOPTERA. 
Allowing them to be a group which will eventually be split up and are 
now maintained lor convenience rather than logical fact we can discuss 
them individually and need make no general statements about the 
family as a whole. The family is by de Saussure divided into seven 
tribes, regarded by Kirby as six sub-families. The following key 
follows de Saussure 5 s arrangement and is given in Sharp’s Insects :— 
1 . Antennae ten-jointed ; posterior tarsi aborted. Tribe 1 . Tri- 
dactylides. 
I 5 . Antennae many jointed ; posterior tarsi normal. 
2. Tarsi compressed, the second joint minute. 
3. Anterior legs fossorial ; anterior tibiae at the apex with two to 
four divisions. Pronotum elongate, ovate, rounded behind. Female 
without ovipositor. Tribe 2. Gryllotalpides . 
3’. Anterior legs formed for walking. Ovipositor of the female 
visible (either elongate or rudimentary). 
4. Posterior tibiae biseriately serrate. Tribe 3. Myrmecophilides . 
4’. Posterior tibiae biseriately spinose. Ovipositor straight. 
5. Antennae short, thickish, almost thread-like. Facial scutellum ex- 
serted between antennae. Posterior tibiae dilated. Gen. Myrmecophila* 
5’. Antennae elongate, setaceous. Facial scutellum transveise, 
visible below the antennae. Tibiae slender. 
6. Posterior tibiae armed with two strong spines, not serrate be¬ 
tween the spines. Tribe 4. Gryllides. 
6’. Posterior tibiae slender, armed with slender spines, and ser¬ 
rate between them. Tribe 5. Oecanthides. 
2’. Second joint of the tarsi depressed, heart-shaped. 
3. Posterior tibiae not serrate, but biseriately spinose. 
4. The spines on each side three and mobile ; apical spurs on the 
inner side only two in number. Ovipositor short, curved. Tribe 6. 
Trigonidiides. 
4’. The spines numerous, fixed. Ovipositor elongate, straight. 
Gen. Stenogrylliis. 
:: The genus MyrmecophUa, being exceptional in several respects, is treated separately. 
