. The Canadian field-naturalist. Natural history. 1915] The Ottawa Naturalist. 41 Plethopeltis [saratogensis Index; 75. Convexity ; great. Eyes ; close to glabella. Cephalon,- unvariable, wider than long, never upturned at anterior margin. Posterior development into nucal spine. Glabella; circum-glabellar furrow faint to strong, 2 pairs of faint glabellar furrows and median ridge. Plethopeltis, . » saratogensis Index; 75. Convexity ; great. Eyes ; close to glabella. Cephalon; unvariable. wider than long, never upturned at anterior margin. Posterior development into nucal spine. » Glabella; cir
. The Canadian field-naturalist. Natural history. 1915] The Ottawa Naturalist. 41 Plethopeltis [saratogensis Index; 75. Convexity ; great. Eyes ; close to glabella. Cephalon,- unvariable, wider than long, never upturned at anterior margin. Posterior development into nucal spine. Glabella; circum-glabellar furrow faint to strong, 2 pairs of faint glabellar furrows and median ridge. Plethopeltis, . » saratogensis Index; 75. Convexity ; great. Eyes ; close to glabella. Cephalon; unvariable. wider than long, never upturned at anterior margin. Posterior development into nucal spine. » Glabella; circum-glabellar furrow faint to strong, no glabellar furrows no ridge. Agraulos ceticephalus. Index; 63. Convexity ; low. Eyes ; farther apart than in preced- ing. Cephalon; variable, trom wider than long to longer than wide, anterior margin slightly upturned in some specimens. No nucal spine. Glabella; no circum-glabellar furrow, 4 pairs of glabellar furrows, ridge, eye lines. Plethopeltis armatus. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa
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