86 
Psyche 
[September 
central part of pronotum strongly swollen and very wide, 
strongly and uniformly convex for its entire length, the 
swollen area extending laterally so as to leave no explanate 
margins, the lateral margins very narrow, carina-like, 
linear for its entire length. Scutellum slightly wider at 
base than median length. Hemelytra of brachypterous 
form strongly convex, decurved on the side so as to cover 
the sides of the abdomen, strongly coriaceous with areas 
and veins coalesced and obliterated; membrane entirely 
coriaceous with veins and cells indistinguishable, in- 
separable from the corium. Rostrum long, reaching be- 
tween hind coxae. Legs moderately long, rather slender. 
Antennae rather long, quite slender; segment I moderately 
incrassate, stoutest; n longest, slender; m and IV slender, 
scarcely thicker than II. Macropterous form unknown. 
Type of genus, Oiosalda cahoti, n. sp. 
Superficially, Oiosalda resembles the genus Lampracan- 
thia Reuter, but it is easily differentiated by the very slend- 
er antennae, smaller and widely separated ocelli, and the in- 
distinctly marked-off collum. In Lampracanthia, the an- 
tennae are strongly swollen, ocelli larger and approximate, 
humeral angles acutely produced, and the entire dorsal sur- 
face sparsely clothed with long erect hairs. The same char- 
acters as noted above also distinguish the new genus from 
Saida Fabricius. 
Oiosalda cabot i, n. sp. 
Brachypterous form: Deep black, smooth, practically 
nude, very shining, the entire dorsal surface with only a few 
scattered, very short, inconspicuous, almost fleck-like pubes- 
cence of a golden color. 
Size: Length, 3.00 mm; width, 1.20 mm. 
Head : Width across eyes, 0.60 mm. ; median length, 1.20 
mm. Interocular space practically subequal to the width of 
an eye. Head black, feebly rugulose, without median longi- 
tudinal groove, without any callosities or strongly swollen 
areas, with two flavous spots on each side (one between an 
ocellus and an eye and other farther forward and just back 
Explanation of Plate 9 
Oiosalda cahoti, new genus and species. 
