( 66 ) 
30. Hip. discoideus, Serv. 
Oedipoda discoidea, Serv. Hist. Orthop., 724. 
Acridium tuberculatum, Pal. Beauv., Ins., 145, PI. 4, Fig. 1. 
Hippiscus discoideus, Stal. Recens. Orth., I, 121. 
This is occasionally met with in the extreme southern part of the 
state, Union county being as far north as 1 have positive evidence of 
its being found. 
31. Hip. phoenicopterus, Germ. 
Locusta apiculata, Harr. Cat., 56. 
corallina, Harr. Rep., 176. 
Acridium phoenicopterum, He Haan. Bijdr. Kenn. Orth , 144. 
Oedipoda phoenicoptera, Germ., Burm. Handb. Ent., II, 643, 
obliterata ? Germ., Burm. Handb. Ent., II, 643. 
corallina, Erichs. Archiv. f. Nat., IX, 229. 
Hippiscus phoenicopterus, Scudd. Geol. Surv.N. Ilamp. I, 377. 
Found occasionally in various parts of the state ; but by no means 
common. 
32. Camnula pellucida, Scudd. 
Oedipoda pellucida, Scudd. Bost. Jour. Nat. Hist., VII, 472. 
atrox, Scudd. Geol. Surv. Neb., 253. 
Camnula tricarinata ? Stal. Recens. Orth., I, 120. 
pellucida, Scudd. Geol. Surv. N. Hamp., 1,378. 
I have never, that I am aware of, met with this species in Illinois, 
but find this locality given by Mr. Scudder in the Geological Survey 
of New Hampshire. 
Group Acridini. 
33- Pezotettix unicolor, Thos. Synop. Acrid., 151. 
Found in southern, and probably in central, Illinois. 
34- Pez. minutipennis, sp. nov. 
Female. Head short, eyes approximate above ; the vertex very 
narrow between them, suddenly expanding to lateral angles just in front 
of them, slightly, sometimes scarcely, sulcate. Face, seen from the side, 
oblique and arcuate ; frontal costa somewhat prominent, continuous 
nearly or quite to the clypeus, sides parallel, not, or but very slightly, 
sulcate. Pronotum cylindrical, the median carina distinct, though it 
is but a very slender line ; lateral carina wholly obliterated ; sides 
nearly parallel, expanding very slightly posteriorly ; anterior margin 
squarely truncate ; posterior margin truncate, with a slight notch at 
the middle, sometimes scarcely distinct; the posterior transverse in- 
cision is situated much behind the middle, reducing the posterior lobe 
to but one-third the length of the pronotum ; the posterior lateral 
angle rounded, and the margin from thence up to the middle rounded 
