6. HEMIPTERA-HETEROPTERA. 
Pangeus tenuis, Ubler, Bull. U.S. Geol. & Geog. Surv. iii. p. 390. 
Aithus insularis, Dall. nec Hope, Cat. Hem. i. p. 120. 24°; Walk. Cat. Het. i. p. 152. 24°, 
Hab. Norra America, Arizona?.,—Mexico! (Mus. Berol.), Orizaba*; GuatTEMana, 
Capetillo, Zapote, Aceituno (Champion); Nicaraeua, Chontales (/Janson).—CoLomBia ; 
VENEZUELA*; TRINIDAD®; BRAZIL. os 
This wide-ranging species seems mostly to vary in the depth and distinctness of the 
transverse impression on the pronotum. Dallas identified the South-American speci- 
mens in the British Museum with doubt as the Cydnus insularis, Hope. Having satis 
fied myself that they belonged to the above species, I forwarded a specimen to Oxford 
for comparison with the type of insuwlaris, which Prof. Westwood writes me is a much 
smaller species, besides differing in many other respects. 
3. Pangeus bilineatus. 
Cydnus bilineatus, Say, Journ. Ac. Phil. iv. p. 315. 1; Compl. Writ. ii. p. 242. 1. 
Aithus bilineatus, Dall. List Hem. i. p. 119. 20. 
Cydnus femoralis, H.-S. Wanz. Ins. v. p. 98, fig. 548. 
Aithus robertsonii, Fitch, sec. typ. et Signoret. . . 
Pangeus bilineatus, Uhler, Bull. U.S. Geol. & Geog. Surv. ii. p. 275, iii. p. 383; Proc. Bost. Soc. 
Nat. Hist. xix. p. 371. 
Hab. Norta Americas, Eastern and Southern States as far west as middle of Texas 
( Uhler).—Mexico, Matamoras (U//er). 
This species is included in the fauna on the authority of Prof. Uhler, who writes :— 
“One specimen from Matamoras, Mexico, agrees with the form as seen in the Atlantic 
region.” ‘The same author remarks :—“ It is of importance to record that this species 
varies very much in some of its structural features. In a few specimens, which were 
normal in other respects, the margin of the clypeus was scalloped each side of the 
middle, and emarginated in front of the tylus. The second and third joints of the 
antenne are sometimes equal; at others, either may be longer than the other. The 
ostiolar canal and the plate to which it is attached vary in length and width, and are 
often ragged on the posterior margin. Two specimens have been examined by me 
which had the ostiolar piece of one side normal, and on the opposite side triangular 
and jagged. Usually there are but three pits and bristles on the costal margin; but 
occasionally there are four, and in one specimen I noticed five.” 
Of this species Mr. Townend Glover writes (Ill. Ins. Or. Hem. p. 21) :—“The fos- 
sorial legs fit it especially for digging ; and it is commonly found beneath sticks and 
stones on the ground in Maryland. (P.R. U.)” 
4. Pangeus fortis. (Tab. III. fig. 8.) 
Aithus fortis, Walk. Cat. Het. i. p. 151. 217. 
Pangeus? fortis, Uhler, Bull. U.S. Geol. & Geog. Surv. iii. p. 389. 
Hab. Mexico, Oaxaca !, San Luis Potosi (Dr. Palmer). 
