118 | HETEROCERIDZ. 
Elytra dark fuscous, very finely and evenly pubescent and indistinctly punctate, the 
lateral margin narrowly yellow from the base to the apex: in front of the middle are 
three yellow marks; the most anterior is a longitudinal one placed on the middle of the 
width a little behind the base; between this mark and the suture, but placed further 
back, there is a similar yellow mark, and at the outside a curved humeral mark con- 
necting with the yellow lateral margin; the most posterior point of this curved mark 
reaches just as far back as does the anterior sutural mark; a large zigzag mark 
behind the middle connects also with the yellow margin; and at the apex there is a 
longitudinal mark connected with a dilatation of the marginal yellow colour so as to form 
a hamate mark. The colour of the under surface is variable, but is a mixture of fuscous 
and yellow. ‘There is no trace of any oblique line on the metasternum. Although an 
obscure and ordinary species in appearance, this is readily distinguished from those 
resembling it, by the absence of the raised line on the metasternum. 
4. Heterocerus mexicanus. 
Parum elongatus, opacus, fusco-testaceus, elytrorum signaturis magnis pedibusque testaceis; prothorace 
transversim sat convexo, densissime subtilissimeque punctato, angulis posterioribus marginatis; elytris 
obsolete punctatis, pube tenuissima equaliter vestitis, signaturis testaceis sepius vage extensis, presertim 
circa scutellum ; metasterno linea obliqua munito. 
Long. 2, lat. ? lin. 
Hab. Mexico, Guanajuato (Sallé); GuatemaLa, Duenas, Panjachel 5000 feet 
(Champion). 
A rather narrow but not elongate insect, with vague coloration. Mandibles quite 
short ; front of head and surface of labrum densely pubescent, the front of the latter 
nearly truncate, scarcely emarginate. Thorax rather convex, fusco-ferruginous, 
margined about the hind angles. LElytra dull, not at all striate, very finely punctate, 
and very finely and delicately pubescent, the pubescence being without the least 
appearance of pruinosity (or shining particles) ; they are dark in colour, but have very 
large yellow marks, which occupy one half or more of their area, according to the 
amount of their extension; there is a yellow basal mark close to the scutellum, one 
behind this near the suture, a subhumeral one, these three more or less vaguely extended 
and confluent, so as sometimes to make the whole of the basal portion of the wing- 
cases pale; behind the middle there isa large irregular mark extending inwards and for- 
wards and in front reaching the middle; and there is a large apical pale mark dilated at 
the margin, and joining there the postmedian mark. Beneath the colour is fusco- 
ferruginous, the prothorax being yellow ; the tibie are but little infuscate. The raised 
line under the middle femur is very distinct. The front tibiz are very broad; and the 
spines with which they are armed are stout. 
The species appears to be rather variable ; the individuals from Guatemala are rather 
broader, and the upper surface is darker, with the pale spots more definitely limited, 
