1873.] -<0 [H orn. 



tures at the sides only, pygidium coarsely but not densely punctured. 

 Lower crest of hind tibia; not dentate. Epipleurae unistriate. Length 

 .36-.40* inch ; 9-10 mm. 



The above synonymy is that of Marseul, confirmed by a comparison 

 with a specimen from Mexico. 



The species has a wide distribution, occurring from Cajon Pass, Cali- 

 fornia, to Camp C4rant, Arizona. 



H. cacti. Lee. Ann. Lye. Y., p. 162 : Mars. Mon. 1857, p. 400, pi. 10. 

 fig. 5. 



Mentum coarsely punctured, triangularly emarginate, with an ele- 

 vated line extending obliquely from the hind angles to the middle of 

 the emargination on each side. Prosterum in front acute. Supra-orbital 

 stria as in the preceding, front on each side near the base of mandibles 

 with rudimental frontal stria. First dorsal stria short, not reaching the 

 middle ; second entire, subhumeral moderately deep extending from 

 apex to basal fourth. Propygidium shining at middle, opaque at the 

 sides and apex, and coarsely and sparsely punctured : pygidium opaque, 

 sparsely and equally punctured. Hind tibias as in the preceding species. 

 Length, .20-30 inch ; 5-7.5 mm. 



Occurs with the preceding. My specimens of both were taken in de- 

 composing Cereus. 



H. quadridsntata, Fab. Ent. Syst. I., p. 74 ; Payk. Mon. p. 109, pi. 

 9, tig-. 4: Mars. M >n. 1853, p. 212, pi. 5, fig. 10 ; I860, p. 608 ; platysma, 

 Er. Jahr. 1834, p. 95. 



3Ieutum slightly concave transversely, sparsely punctured and with 

 feeble oblique line, in front triangularly emarginate. Head without 

 supra-orbital stria. Elytra with two dorsal stria, first short extending 

 one-third, second entire, slightly arcuate, subhumeral moderately deep, 

 extending three-fourths to base. Propygidium shining coarsely punc- 

 tured at the sides, pygidium opaque, coarsely and equally punctured. 

 Hind tibia; with the lower and upper crests dentate. Epipleuraj smooth 

 unistriate. Length .16-. 20 inch, 4-5 mm. 



Occurs in the Southern States, West Indies and South America. 



In the males the anterior angle of the thorax has a moderately deep 

 fossa ; the females are devoid of it. 



II. vicina, Lee. Ann. Lye. V., p. 163. 



Head without supra-orbital stria, a bisinuate frontal stria. Mentum 

 trausversely concave, shining, sparsely punctured. Thorax punctured at 

 the sides. Elytra with the second dorsal entire, first snort, scarcely one- 

 third, subhumeral four-fifths the length of the elytra. Propygidium 



*A11 measurements in the present paper are made from the anterior margin of the thorax t, 

 the tip of the elytral suture ; the same method is used by JIarseul. 



