260 MEMOIRS ON THE COLEOPTERA 



equal in length to the anteriorly projecting, arcuate and inferiorly 

 pubescent thoracic horn; eyes well developed; prothorax one-half 

 wider than long, the sides rounded, gradually becoming oblique and 

 straight anteriorly; surface smooth, punctured slightly near all 

 the edges, the basal bead strong and entire; spicules small and very 

 acute; elytra a sixth longer than wide, rounded in not quite apical 

 half, about a sixth wider than the prothorax and twice as long, 

 smooth but with a few sparse punctures antero-internally and some 

 fine punctulation at the apices; pygidium transversely ridged and 

 closely pubescent in basal fourth, the surface thence to the tip in- 

 flexed at about 45, not concave and finely, closely punctate; hind 

 tarsi much longer than the tibiae. Female in general outline nearly 

 as in the male but not quite so stout and generally rather darker in 

 ground color, the pronotum black, with feeble paler mottling; head 

 black, similar in size and form but much more coarsely and densely 

 rugose, the clypeal apex much narrower, feebly reflexed and slightly 

 bilobate, the horn of the male reduced to a small but strong tubercle 

 at the exact centre of the cephalic surface; prothorax two-thirds 

 wider than long, in outline as in the male but with the surface evenly 

 convex and much more strongly sculptured, the punctures coarse 

 and close anteriorly, smaller and sparse posteriorly; elytra fully a 

 fifth longer than wide, a fourth wider than the prothorax and much 

 more than twice as long, smooth but with very coarse, feebly im- 

 pressed punctures internally and basally, each puncture generally 

 having also a cluster of minute punctures, forming a very remarkable 

 type of sculpture; pygidium shorter and more transverse, more 

 acutely and strongly, transversely ridged barely above the middle, 

 having long pubescence basally, the surface below the ridge concave, 

 glabrous, shining, coarsely and rather loosely punctate, the general 

 plane of the pygidium vertical; propygidium with small dense 

 asperate punctures throughout; hind tarsi barely longer than the 

 tibiae. Length (cf 9) 32.0-47.0 mm.; width 18.0-26.0 mm. Indi- 

 ana, Texas, Alabama and Florida. Abundant. [Scarabaus tityus 



Linn.] tityus Linn. 



Thoracic process longer, similarly pubescent beneath but distinctly 

 longer than the prothorax, with its strongly bifurcate apex gradually 

 and feebly expanded, the upwardly strongly arcuate cephalic horn 

 also much longer and with a sharp denticle internally at a fourth to 

 sixth from the tip; in tityus there is a very obtuse projection very 

 near the tip, which however is generally indistinct and often ob- 

 solete; bilobed clypeal apex broader and more reflexed; prothorax 

 much less transverse, only about a fifth wider than long, the sides 

 obliquely converging and nearly straight anteriorly from a point 

 more posterior; surface still smoother, the small spinules nearer the 

 base of the horn than in tityus; elytra shorter, but very slightly longer 

 than wide, similarly rounded behind and pale, with similar dark 

 mottling, except that the spots are more irregular and have no 

 evident tendency to linear arrangement; surface smooth throughout; 

 pygidium as in tityus, except that the lower inflexed part of the surface 

 is polished and smooth, punctured sublaterally and very densely and 



