330 HETEROMERA. 
s pots); the antenne much shorter; the last joint of the maxillary palpi considerably 
narrower and less angular ; and the ridges on the hind tibie and first hind tarsal joint 
fewer in number. 
35. Mordellistena tabascana. 
Comparatively short, subcuneiform ; the head luteous or reddish, the prothorax luteous, or piceous with the 
margins reddish, the elytra black with a curved oblique reddish-yellow stripe at the shoulders, the basal 
half of the pygidium reddish, for the rest black; the elytra with two fascia—one below the base, extend- 
ing to the shoulders, and one slightly postmedian,—which are connected by a sutural stripe, and the apex, 
yellowish-cinereous-pubescent, the rest of the pubescence partaking of the ground-colour. Palpi flavo- 
testaceous, the last joint of the maxillary pair in the male long and rather narrow, scalene-triangular, in 
the female more ovate; antenne (< ) flavo-testaceous, filiform, moderately long, joint 3 short and slender, 
4 wider and longer than 3, much shorter than 5, subtriangular, 5-11 comparatively stout, very much 
longer than broad, subequal; prothorax transverse; elytra rather short, gradually narrowing from the 
base ; beneath black, the prothorax and the ventral segments, except at the base, reddish ; pygidium 
long, rather stout, more than twice the length of the hypopygium ; legs reddish, the hind pair darker ; 
the hind tibiee with four, the first joint of the hind tarsi with three, and the second joint with two (faint), 
short, oblique ridges. 
Length to end of the elytra 23-23, to tip of the pygidium 3-33, millim.; breadth 3-1 millim. (¢ 2.) 
Hab. Mexico, Teapa in Tabasco (H. H. Smith). 
Two examples, one, a male, in good condition, the other, a female, mutilated and 
without antenne. This species has the facies of a very small example of the var. y of 
M. instabilis. The male specimen described differs from M. instabilis ( ¢ ) by the much 
narrower apical joint of the maxillary palpi. 
36. Mordellistena luteifrons. (Tab. XIV. figg. 24,4, var.; 24a, maxillary 
palpus. ) 
Moderately elongate, somewhat cuneiform, above and beneath black, the anterior portion of the head usually 
more or less reddish-testaceous ; the pubescence coarse and close, brownish-cinereous, and usually with 
intermixed black hairs. Head short, strongly transverse; maxillary palpi black, in one example obscure 
testaceous, rather stout, the last joint comparatively short, scalene-triangular ; antenne short in both 
sexes, rather stout, black, the basal joints sometimes pitchy-red, joints 3 and 4 short, subequal, 5 stout, 
much longer than 4, 5-10 a little longer than broad in the male, almost as broad as long in the female ; 
prothorax moderately transverse ; elytra rather long; pygidium twice the length of the hypopygium, 
a little longer in the male than in the female; legs black, the anterior cox, femora, and tibie, and 
the base of the middle femora sometimes obscure testaceous, the hind tibial spurs testaceous ; the hind 
tibiee with three or four, the first joint of the hind tarsi with three, the second joint with two, short, 
oblique ridges. 
Var. The anterior portion of the head broadly, and a spot on either side of the prothorax in front, reddish- 
testaceous. (Fig. 24.) 
Length to end of the elytra 23-43, to tip of the pygidium 33-42, millim. (¢ 2.) 
Hab. Mexico, Guanajuato (Sallé), Tupataro, Tula (Hége), Xucumanatlan (7. ZH. 
Smith). 
Nine examples of the type, two of the variety. Very near the Guatemalan UW. Jati- 
