402 Harris's Description of 



the clypeus is produced in the form of a very long horn, and 

 the elevated ridges on each side, above the antennae, are also 

 more or less produced and hornlike. Body more convex than 

 in Dicronorhina, opaque and velvety above, and more or 

 less covered with the same opaque substance on the breast. 

 Thorax narrowed before and broad behind, with three shallow 

 emarginations on the hinder edge. Scutel triangular. Elytra 

 gibbous behind, and terminating in a spine at the sutural an- 

 gle. Middle of the abdomen concave in the males. Podex 

 marked with two large whitish square spots, and fringed with 

 tawny hairs. Mandibles concealed, and ending with a thin 

 horny lobe. Maxillae horny, exposed at base only ; the inner 

 lobe very hairy, and armed with a minute tooth at the ex- 

 tremity ; the terminal lobe slender and acute, not toothed in 

 the middle, bearing on its outer side a thick brush of tawny 

 hairs, and articulated to the back of the maxillae nearly at a 

 right angle. Mentum broadest behind the middle, four-lobed 

 anteriorly ; the middle lobes separated by an angular notch ; 

 the lateral lobes, as in the genus Hegemon, less prominent, 

 and separated from those between them by a deep sinus in 

 the margin on each side, designed for the reception of the 

 palpi. Anterior tibiae three-toothed externally ; the teeth very 

 irregular and unequal in the males, and in this sex the inner 

 side of these tibiae is armed with three or more teeth also. 

 There are two spines on the middle of the intermediate tibiae 

 and one spine on the posterior tibiae, in the females ; but 

 these spines are generally obsolete or wanting in the males. 

 The hindmost tibiae alone are fringed with hairs, but the 

 fringe extends along the whole of the inner edge. 



1. MECYNORHTNA POLYPHEMUS. 



Opaque velvet-green above ; top of the head, five longitu- 

 dinal stripes on the thorax, three rows of rounded spots on 

 each elytron, a spot on the scutel, two large square spots on 

 the podex, and the sides of the breast, pale buff-colored ; mar- 

 gin of the clypeus, horns, antennae, and tarsi black. 



Male, Head three-horned ; the anterior horn curved up- 



