288 
The Ohio Naturalist. 
[Vol. V, No. 4, 
Shape stiboval, depressed; head short and broad; scutellum 
small ; hemelytra entirely coriaceous and linearly roughened in 
prominent points, soldered together along a straight suture indi- 
cated by a groove. Rostrum small. Anterior femora basally 
incrassate; tarsal claws single. Abdomen rounded. Male gen- 
ital segments laterally deflected. 
N. stygica Say. (Fig. 1.) 
18'51 — (1832?) — Naucoris stygica Say. pescr. of N. Sp. Het. Hem. of N. A., p. 808. 
1S59 — Comp. Writ, of T. Say. ed. Le Conte, Vol. I, p. 364. 
1876 — Nerthra stygica. Say. Stal, Enum. Hem. V, p. 139. 
1899 — Montandon, Hem. Crypt. S. fam. Mononychinse, Bull. Soc. Scie., Bucarest, An. VII, 
No. 4 and 5 , p. 4 (separate). 
(Not — Mononyx stygicus Uhl., in Kingsley’s Nat. Hist. p. 264, 1885; Uhl., Ch. List, 
p. 27. 1886; Uhl. Proc. Cal. Acad. Sci., 2d ser. IV, p. 290. 1893“94; Comstock, Introduction, 
p. 191, 1888; Comstock, Manual, p. 134, 1899; Howard, Insect Bk., pi. XXIX, fig. 16.) 
• 
Moderate in .size, suboval, depressed; head short and broad 
with four tubercles in the middle, the outer two less elevated 
than the middle two; triangular in front and reflexed. Eyes 
reniform, not very prominent. Ocelli absent. Rostrum short, 
small and so hidden under the head as to be hardly visible (joints 
not counted for this reason). Prothorax, sides subparallel; cur- 
vedly converging in the cephalad third ; base slightly sinuate ; 
Fig. 1. Nerthra stygica 
Say X5. 
Fig. 2. Nerthra stygica 
Say; femm* and tibia 
of first pair. X12. 
laterally flattened; apex nearly straight except at the eyes; disk 
much elevated and roughened. Scutellum triangular, sides sin- 
uated, much roughened. Hemelytra slightly flattened and 
dilated at the humeral angles and gently curvedly sloping to the 
rounded extremity; entirely coriaceous and linearly roughened 
in acute elevations along the lines of the sutures; soldered into 
one piece along a straight sulcate suture extending from the 
caudal angle of the scutellum to the tip of the hemelytra; appar- 
ently soldered to the scutellum as well ; not entirely covering the 
abdomen, the connexival segments being moderately visible 
