204 
IMAGINES 
Osteole with auricle or overhanging ledge, not extending to near body margin in 
a long narrow canal; apical part of media in hind wings joined to radio- 
medial stem, as usual. 
No deep groove on head above, just within the reflected margin. 
Hind tibiae slender, nearly straight, uniformly spined. 
Pronotum not margined in front............. cece eee e ee eees 1. Geotomus. 
Pronotum with impressed submarginal line in front, costal margin rarely 
with 3 or 4 setigerous punctures...........---.--s++-+ 12-2 Pangaeus. 
Hind tibiae strongly flattened and curved; lower side bristly, upper side 
beset with short stout spinules............. ..020 seen eens 3. Cyrtomenus. 
A distinct groove on head above, just within the recurved margin, beset with 
bristles and short spinules. 
Pronotum distinctly margined in front. 
Scutellum about as long as broad, tip acuminate (Cal.) .Macroporus Uhler. 
Scutellum longer than broad, tip narrowly rounded (Col., Tex.)......---. 
SHAT ODES Soto Sma Sis Ait Sac Uc MolnIa tinkeeAtnso Homoloporus Uhler. 
Pronotum not distinctly margined in front.............2.-+2+.00- 4. Aethus. 
Osteolar canal long, narrow, and distinct, reaching three-fourths of the way 
from orifice to body margin; head margin with row of short thick comb-teeth; 
[metasternum carried caudad in the form of a thin plate which is broadened 
laterally, covering 2 or 3 of the abdominal segments;] scutellar apex mucro- 
nate, apical part of media in hind wings not connected with radiomedial stem 
CAMNESEINT) oe Se neisbe ch nse oni slo nabeine tees ras SIN Bee Vb Per cle 5, Amnestus. 
1. Georomus M. & R. (MrELanaetuus Uhl.) 
GEOTOMUS PENNSYLVANICUS Sign. 
Geotomus pennsylvanicus Signoret, Ann. Soc. Ent. Fr., Ser. 6, Vol. 3, p. 207. 
1883. 
Melanaethus picinus Uhler, Bul. U. S. Geol. and Geogr. Surv. Terr., Vol. 3, 
No. 2, p. 391. 1877. Preoccupied. 
One specimen, Urbana, Oct. 21. Pa. (V.D.). 
2. PANGAEUs Stal ‘ 
PANGAEUS BILINEATUS Say 
Cydnus bilineatus Say, Jour. Acad. Nat. Sci. Phil., Vol. 4, p. 315. 1825. 
Eastern and Southern States to Texas and Utah, also Iowa and Ore- 
gon (V.D.), and Missouri and Arizona (Bol.). In our collections from 
numerous localities in central and southern Illinois, but from northern 
Illinois I find only a single example so labeled—in the Bolter Collection. 
ae dates range from March 8 to June 30, and from August 18 to Octo- 
er 30. 
[A group of nymphs found by Mr. Hart under a piece of board ina 
sandy hollow near Havana, Ill., August 19, have the head structure of 
Aethus imagines, but notwithstanding these structural details they are 
undoubtedly the nymphs of Pangaeus bilineatus. The above nymphs are 
