XII ACRIDIIDAE 309 



epoch. Several forms, including three peculiar genera, have 

 been found in the Tertiary strata at Florissant. The remains 

 from the Mesozoic layers are apparently very fragmentary and 

 obscure. 



Brongniart has instituted a family of Insects under the name 

 Palaeacrididae ^ for some fossil Insects from the Carboniferous 

 strata at Commentry. He considers that these Insects were 

 abundant in the epoch of the Carboniferous strata. 



The very large number of genera and species of Acridiidae 

 have been recently arranged in nine tribes by Brunner von 

 Wattenwyl : 



1. Feet without a claw-pad.^ [Pronotum covering all the body.] Tegmina 

 lobe-like. Tribe 1. Tettigides. (Figs. 179, 180, Tettix, Xerophyllum, 

 Cladonotus.) 

 1'. Feet with a claw-pad. 



2. Antennae shorter than the anterior femora. 

 3. Head short, as if compressed from in front. 



4. Body bladder-like, inflated.-^ [Pronotum covering half the 

 abdomen.] South African species. Tribe 2. Pxeumorides. 

 (Fig. 182, Pneumora scutellaris.) 

 4'. Body ordinary. Tribe 3. Mastacides. (Fig. 181, Mastax 

 guttatus.) 

 3'. Head very elongate. [Body apterous or snb-apterous.] Tribe 

 4. Proscopiides. (Fig. 178, Cephalocoema lineata.) 

 2'. Antennae longer than the anterior femora. 

 3. Prosternum unarmed. 



4. The plane of the vertex of the head meeting the plane of 

 the front of the head as an angle. The former produced or 

 declivous. The face looking down. Tribe 5. Tryxalides. 

 (Fig. 165, Tryxalis nasuta ; Fig. 173, Mecostethus grossus.) 

 4'. Planes of the vertex and front of the head connected in 

 a rounded manner. Face looking forwards. Tribe 6. 

 Oedipodides. (Fig. 177, Pachytylus ; Fig. 185, Methone.) 

 3'. Prosternum with an elevated lamina in front, either irregularly 

 swollen or mucronate. 

 4. Foveoles of the vertex superior, contiguous, forming the 

 apex of the vertex. Face looking much downwards. 

 Tribe 7. Pyrgomorphides. (Fig. 183, Pyrgomo7-pha 

 grylloides.) 

 4'. Foveoles of the vertex, either superior (but not forming the 

 apex of the vertex), or lateral, or inferior, or quite obsolete. 



^ Bull. Soc. Rouen, 1885, and Inscctes fossiles, etc. 1894, p. 439. 

 - A few species of Proscopiides and Oedipodides, though placed in the next 

 division, are destitute of any claw-pad. 



^ This applies specially to the males. D. S. 



