MORDELLISTEN A. ; 337 
joint of the maxillary palpi, the slender antenne, the four basal joints of which are 
yellow and the fifth joint not very much stouter than the fourth, &c. The patches of 
cinereous pubescence on the elytra are larger and less numerous, and they tend to form 
irregular zigzag fascie; the anterior coxe are yellow, the hind tibial spurs piceous. 
49. Mordellistena quadrifasciata. (Tab. XV. fig. 6.) 
Moderately elongate, narrow, subparallel, black, finely and rather sparsely pubescent ; the elytra with nume- 
rous, transverse, irregular patches of yellowish-cinereous hair, these patches forming four zigzag fascie, 
for the rest blackish-brown-pubescent, the head and prothorax partly cinereo-pubescent. Head very 
convex ; maxillary palpi pitchy-brown, the apical joint moderately stout, somewhat cultriform; antenne 
piceous with the four basal joints obscure testaceous, moderately long, joints 3 and 4 short, equal, 5 very 
much longer and stouter than 4, 5-10 equal in width and length, a little longer than broad, 11 much 
longer than 10; prothorax almost as long as broad ; pygidium elongate ; legs black, the hind tibial spurs 
testaceous ; the hind tibie and the first joint of the hind tarsi each with three, the second joint of the hind 
tarsi with two, very short, oblique ridges near the tip. 
Length to end of the elytra 24, to tip of the pygidium 3, millim. 
Hab. Mexico, Northern Sonora (Morrison). 
One specimen. Very near JZ. sparsa and M. tessellata: from the former it differs by 
its longer thorax and finer pubescence, and by the cinereous patches on the elytra being 
much less scattered and forming four zigzag fascie; from the latter it may be distin- 
guished by the less slender antenne and by the more regular arrangement of the sparser 
and finer elytral pubescence. 
50. Mordellistena cincta. 
Short, cuneiform, black, the mouth-parts testaceous: the elytra with the base, a median fascia, and in one 
specimen the apex broadly, yellowish-cinereous-pubescent, the rest of the elytral pubescence in great part 
black, that on the head and prothorax brownish. Head very convex; maxillary palpi testaceous or brown, 
the last joint in both sexes elongate-triangular with the inner apical angle almost rounded; antenne 
pitchy-brown with the four basal joints testaceous, slender, filiform, elongate in the male, shorter in the 
female, joints 8 and 4 short, equal, 5 fully twice as long as 4, 5-10 in the male elongate, subequal, in the 
female a little shorter ; prothorax broader than long; elytra comparatively short; pygidium elongate, 
more than twice the length of the hypopygium; legs black, the anterior femora and tibiz obscure testa- 
ceous, the hind tibial spurs testaceous ; the hind tibize with three, the first and second joints of the hind 
tarsi each with two, short, oblique ridges. 
Length to end of the elytra 13-1}, to tip of the pygidium 2-23, millim. (¢ 9.) 
Hab. GuateMALa, Zapote, San Gerénimo (Champion). 
Two examples. This very minute species closely resembles M. perexiqua and 
M. pulicaria; but it has very much longer antennex, the last joint of the maxillary 
palpi very similarly formed in both sexes, and the carine on the hind legs differently 
arranged. MV. cincta is perhaps nearest allied to M. annulipyga, from which its longer 
and more slender antenne and pygidium, narrower apical joint of the maxillary 
palpi, much smaller size, &c., sufficiently distinguish it. The cinereo-pubescent median 
fascia and apical patch are well marked in the female, but in the male they are not 
very distinct. 
BIOL. CENTR.-AMER., Coleopt., Vol. 1V. Pt. 2, October 1891. 9xXx 
