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Volume 80, 1952
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Acanthosomatinae

1. Body shield-shaped; pronotum strongly declivous, giving a “hunch-backed” appearance, ventral abdominal spine very long, strongly curved in front, and reaching or surpassing anterior coxae, mesothoracic keel very large and expanded, extending forward to anterior end of prothorax, well in front of fore coxae; length about 11 mm. Oncacontias vittatus (Fabr.) (Figs. 6, 26, 41, 51)
Body more or less ovoid; pronotum not strongly declivous and body not “hunch-backed”; ventral abdominal spine smaller, not strongly curved in front, and not reaching anterior coxae; mesothoracic keel smaller and less expanded, not extending forward well in front of fore coxae Rhopalimorpha Dallas 2
2. Anterior angles of pronotum rounded, not produced; anterior abdominal spine very short, not surpassing posterior margin of mid-coxae; mesothoracic keel low, ridge-like, not notably expanded towards front, and not reaching in front of apex of second rostral segment; second antennal segment longer than or about as long as third; rostium reaching middle coxae; punctation of venter of prothorax conspicuous, coarse, and dark; species widespread; length, 6.5–9 mm subgenus Rhopalimorpha Dallas 3
Anterior angles of pronotum acute and produced; anterior abdominal spine longer, reaching to anterior margin of midcoxae; mesothoracic keel higher, plate-like, notably expanded towards front, and passing anterior to apex of second rostral segment; second antennal segment shorter than third, rostrum reaching posterior coxae; punctation of venter of prothorax
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inconspicuous, fine, shallow, and almost concolorous with general surface; known distribution restricted, alpine R. (Lentimorpha) alpina sp. & subg. nov. (Figs. 5, 29, 30, 42)
3. Apex of scutellum acute; abdomen with a well-developed connexivum, extending well beyond margins of closed hemelytra; maxillary plate processes small, tubercle-like, not reaching antennal base; plate of metathoracic scent-gland orifice broadest near middle, posterior margin strongly convex, ventral surface nearly flat; metathoracic evaporating area small, scarcely surpassing outer margin of plate R (Rhopalimorpha) obscura A. White (Figs. 3, 27)
Apex of scutellum widened and rounded, abdomen without a well-developed connexivum, scarcely projecting beyond margins of closed hemelytra; maxillary plate processes larger, shelf-like, reaching close to antennal base, where expanded, plate of metathoracic scent-gland orifice broadest near outer margin, posterior margin scarcely convex, ventral surface strongly convex; metathoracic evaporating area large, extending well beyond outer margin of plate R (Rhopalimorpha) lineolaris Pendergrast (Figs 4, 28)
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