MANNOPHORUS.—ISCHNOCNEMIS. 83 
haud attingente, interspatiis creberrime punctatis, apice obtuse truncato ; epipleuris verticalibus, a dorso 
linea sublevi demarcatis; antennis 2 corpore multo brevioribus, articulo tertio distincte longiore, 1°-5™ 
scabroso-punctatis, 6°-11™ cano-sericeis; mesosterno declivi; pedibus brevibus, tarsis posticis articulo 
primo sequentibus duobus haud longiore. 
Long. 6 lin. 9. 
Hab. Mexico, San Luis Potosi, Alvarez Mountains (Dr. Palmer). 
The antenne of the female are much shorter than in the corresponding sex of 
M. letus; and the scutellum, though broad, is more acutely pointed behind ; other- 
wise the generic characters are very similar in the two species. The raised line of the 
elytra is narrow and well defined; but the absence of a pale stripe accompanying it 
gives a different facies to the insect from that of VW. letus and other allied species. 
ISCHNOCNEMIS. 
Ischnocnemis, Thomson, Systéme Céramb. p. 199 (1864). 
The single Mexican species on which this genus was founded is closely allied to 
Mannophorus, the chief difference lying in the greater length of the basal joint of the 
hind tarsi and the attenuated pointed apex of the scutellum. The species is much larger, 
however, and relatively longer, with longer antenne. Leconte places /schnocnemis 
in his group Tyloses, on account of the alleged truncated apex of its mandibles. I find 
both mandibles acutely pointed ; and as he further states that the genus has a pro- 
tuberant in contradistinction to a sloping mesosternum, which is not the case, it is to 
be inferred that he has wrongly identified it. 
1. Ischnocnemis costipennis. 
Ischnocnemis costipennis, Thomson, loc. cit. p. 199. 
Hab. Mexico. 
2. Ischnocnemis minor. 
Angusta, elongata, enescenti-nigra, elytris costis eburneis duabus elevatis apicem fere attingentibus, interspa- 
tiis crebre equaliter punctulatis, apice rotundato; thorace antice distincte angustato, dorso inequali 
crebre confluenter punctato ; scutello basi lato, apice subelongato acuto ; antennis 2 corpore vix longiori- 
bus; tarsis posticis articulo primo duobus sequentibus vix longiore ; corpore subtus chalybeo, nitido, fere 
nudo, discrete punctato. 
Long 53 lin. 9. 
Hab. Mexico (Boucard). 
Female much more slender than the corresponding sex of J. costipennis, from which 
it differs conspicuously in colour, being of deep brassy or chalybeous black (very 
shining beneath), whilst the female of I. costipennis is pale testaceous red. The 
insect bears some resemblance to Sphenothecus cyanicollis. | 
m 2 
