304 HETEROMERA. 
and fine brownish pubescence. The colour of the palpi, legs, and antenne is variable. 
In some of the females the antenne are shorter than in others. The non-elongated 
anterior carina of the hind tibie distinguishes /. debilis from WU. funerea, M. flavicornis, 
&c. The thorax is shorter than in I/. flavicornis. Some of the Guatemalan specimens 
seem to be more finely pubescent than those from Mexico, but I am unable to separate 
them. 
43, Mordellistena rubricollis. (Tab. XV. figg. 2,¢; 2a, maxillary palpus.) 
Moderately elongate, subparallel, black, the head (the eyes excepted) and prothorax, and sometimes the 
scutellum, reddish- or flavo-testaceous, the pubescence partaking of the ground-colour. Head moderately 
large; maxillary palpi long, testaceous, the apical joint sometimes infuscate, the latter elongate-triangular 
in the male, a little shorter and more bluntly truncate at the apex in the female, the second joint stout in 
the male, more slender in the female ; antennz short in both sexes, a little stouter in the female than in 
the male, black or pitchy-brown, the basal three or four joints more or less testaceous, joints 3 and 4 
short, equal in length, 5 considerably longer and much stouter than 4, 5-10 gradually deereasing in width 
but equal in length, longer than broad; prothorax not much broader than long; elytra moderately elon- 
gate, subparallel in their basal half; beneath varying in colour from black with the head and prothorax 
reddish-testaceous to reddish-testaceous with the venter and pygidium black, the pubescence on the dark 
parts brownish-cinereous (of a more ashy colour than that on the elytra); pygidium elongate in the male, 
shorter and stouter in the female, about twice the length of the hypopygium; the anterior femora and 
tibie, the middle femora (except sometimes at the tip), the middle tibie in some examples, and the hind 
tibial spurs, testaceous, the rest of the legs black ; the hind tibia with three or four—the first sometimes 
indistinct or obsolete,—the first joint of the hind tarsi with three, and the second joint with two, short, 
oblique, parallel ridges. 
Length to end of the elytra 24-334, to tip of the pygidium 3-4, millim. (d 9.) 
Hab. Mexico, Chilpancingo, Venta de Zopilote, Atoyac, Teapa (H. H. Smith); 
GuaTEMALA, El Jicaro in Vera Paz (Champion). 
Seven specimens from Mexico and one (¢) from Guatemala. Very like M. azteca, 
but differing from that species in the much shorter and less slender antenne in both 
sexes, the black (not brownish-cinereous) elytral pubescence, and the shorter pygidium 
(especially in the female sex). The short, subequal carine of the hind tibie and 
the black elytral pubescence separate M. rubricollis from M. occidentalis. The 
underside varies in tint according to the predominance of the reddish or of the 
black colour. It is not impossible that MW. rubricollis may prove to be a colour-variety 
of UM. nigripilis. 
44, Mordellistena azteca. (Tab. XV. figg. 8,36; 3a, maxillary palpus.) 
Moderately elongate, narrow, subparallel, black, the palpi, head (the eyes excepted), and prothorax flavo-testa~ 
ceous or testaceous ; densely sericeous-pubescent, the pubescence on the elytra brownish-cinereous, for the 
rest partaking of the ground-colour. Head moderately large; maxillary palpi very long, the last joint 
cultriform, long, rather stout; antenne long, very slender, filiform, testaceous, the outer joints usually 
darker, joints 3 and 4 short, equal, 5 twice as long as 4, 5-10 elongate, subequal; prothorax a little 
broader than long, somewhat strongly rounded at the sides, narrowing a little behind ; elytra moderately 
long, subparallel in their basal half; beneath, the head and prothorax excepted, black, brownish-cinereous- 
pubescent ; pygidium very elongate, about two and a half times the length of the hypopygium; anterior 
and middle legs, the middle tarsi excepted, flavo-testaceous, the hind legs b ack with the tibial spurs 
