90 DESCRIPTIONS OF NEW SPECIES. 



A very distinct genus, not only by the form of the antennae but 

 by the 4th tarsal joint being not lobed. It agrees with Phausis 

 in the latter character, as well as in the last joiut of the antennae 

 being small and acicular ; but differs by the antennte having one 

 joint less, and by the thorax being destitute of hyaline spots. 



The under surface of the body is testaceous, so that I cannot 

 ascertain the number of luminous ventral segments, but believe 

 them to be two, as in Phausis. 



325. M. dilatatus. Elongato-ovalis, thorace pallido medio fusco, 

 confertim scabro-punctato, medio vage canaliculato, et obsolete carinato, 

 elytris fuscis, vage rugose punctatis, pone basin dilatatis, costa humerali 

 acuta postice sensim obliterata ; subtus testaceus, oculis maximis nigris, 

 antennis fuscis. Long. *25 — *30. 



Cape San Lucas, Lower California ; collected by Mr. Xantus. 



CHAULIOGMTHUS Hentz. 



326. C opacus. Capite thoraceque nigris opacis, hoc latitudine 

 haud breviore, limbo omni luteo, lateribus reflexis, basi bisinuatim 

 marginato, elytris thorace latioribus, opacis punctatis, luteis dimidio 

 postico nigro, limbo angusto testaceo ; scutello nigro ; subtus testaceus, 

 pedibus nigris, femoribus basi coxisque luteis ; antennis nigris, (maris) 

 valde elongatis tenuibus, articulo 3io sequente duplo breviore. Long. -42. 



Arizona ; Dr. B. J. D. Irwin, U. S. A. Allied to the Texan 

 C. limbicollis Lee, but the markings are quite different, and the 

 thorax is more quadrate. The large black spot of the elytra 

 extends from the middle nearly to the tip, leaving a narrow 

 sutural apical and lateral margin yellow: the anterior outline of 

 the spot is oblique backwards from the suture to the side. 



OMETHES Lec. 



327. O. marginatus. Elongatus niger, pube erecta pallida vestitus, 

 capite punctato, fronte et ore testaceis, thorace testaceo nitido, parce 

 fortiter punctato, latitudine plus duplo breviore, lateribus valde rotun- 

 datis, margine omni reflexo ; elytris punctatis, substriatis, sutura mar- 

 gineque externo testaceis, scutello testaceo ; pectore pedibusque testaceis, 

 antennis piceis, articulis 3 primis testaceis, 3io secundo sesqui longiore. 

 Long. -20. 



Middle and Southern States ; rare. The generic characters 

 are sufficiently detailed in my Classification of Coleoptera of 

 North America, p. 187. 



