254 MEMOIRS ON THE COLEOPTERA 



Pygidium (cf) much less transverse, more polished and with minute 

 sparse punctulation 3 



2 Form very stout, oblong, strongly convex, shining and deep black, 

 the under surface obscure castaneous. Male with the head fully a 

 third as wide as the prothorax, the base of the clypeus extended 

 upward, forming a gradually attenuated and slightly arcuate horn, 

 nearly twice as long as the head and with moderate close-set 

 punctures, like the concave surface of the trapezoidal clypeus before 

 it, the clypeal apex reflexed in a high transverse bilobed plate, with 

 its sides subparallel; eyes very moderate, the canthus not at all 

 prominent; antennal club slender, as long as the preceding six joints; 

 prothorax three-fourths wider than long, widest rather before the 

 middle, the sides rounded, becoming very oblique, faintly sub- 

 sinuate and more conspicuously fimbriate apically, the apex trans- 

 verse, with a very broad flat bead, which is sometimes posteriorly 

 angulate and produced medially, less than half as wide as the base, 

 which is very strongly beaded; surface smooth, abruptly declivous 

 at a right angle before the middle viewed from above, the flattened 

 or feebly concave surface thence gradually less steep to the apex, 

 transversely oval, coarsely punctato-rugulose and not extending to 

 the sides, the rugosity however extending to the sides, the edge of the 

 declivity at the middle faintly tumid and usually very slightly bi- 

 lobate; scutellum perfectly smooth; elytra short, about as wide as long, 

 as wide as the prothorax, parallel, abruptly, very obtusely rounded at 

 apex, having widely separated, coarsely impressed lines, bearing 

 moderate, shallow, posteriorly open annuli; punctures broadly 

 confused on the second interval basally; pygidium not quite 

 three times as wide as long, wholly glabrous, moderately con- 

 vex, slightly inflexed in plane, the small umbo behind basal 

 third; under surface with long dense conspicuous and rusty- 

 brown vestiture, sparse on the abdomen. Female narrower 

 than the male, the head more closely punctate, the clypeus 

 but little wider than long, pentagonal, feebly impressed toward the 

 sides, with bilobed apical carina as in the male but smaller and with 

 a strong polished tubercle at the posterior angle, on a line through the 

 middle of the eyes and very remote from the apex; prothorax less 

 transverse, with more evenly rounded sides, which are generally 

 feebly sinuate near the base and slightly narrower than the elytra, 

 the surface smooth, gradually and very moderately though variably 

 punctate anteriorly, more strongly toward the angles; elytra slightly 

 elongate, rounded in posterior two-fifths, being much less obtuse 

 than in the male though similarly strongly sculptured; pygidium 

 still more transverse, less convex and with the even punctuation 

 throughout stronger. Length (u cf, 3 9) 25.0-29.0 mm.; width 

 14.7-16.5 mm. New York to Texas. At times abundantly attracted 

 to the electric lights. [Geotrupes satyrus Fabr. ; ? Cheiroplatys 

 verticalis Fall ( 9 )] satyrus Fabr. 



Form much less stout, smaller in size, similar in coloration, lustre, 

 thoracic fimbrise and pubescence beneath. Male with the head 

 fully a third as wide as the prothorax, as in satyrus but with the horn 



