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50 THE TRIBE ONCIDERINI
TULCUS Dillon and Dillon, gen, nov"
Most closely related to H. robusta, but differs from it as fol­
lows : head with front less constricted between eyes ; eye with lower
lobe more oblong ; pronotum less conical in outline; elytra on base
simply punctate, basal gibbosities broad, feebly elevated, humeri
obtusely tubercled ; antennae with third and fourth segments more
robust ; femora more strongly clavate, metatibiae more strongly
dilated apically ; and procoxae distinctly uncate in male.
Moderate sized, elongate-ovate, robust, convex. Head with front elongate,
sides oblique, gradually narrowed above, not constricted between eyes; gena vertical ;
eye with lower lobe broadly oblong-ovate, one and one-haif times height of gena ;
antennal tubercles prominent, well separated, with a short, robust tooth at apex
in male. Pronotum transverse, sides broadly arcuate, unarmed, apex distinctly
narrower than base; disk broadly tumid each side, at middle with a. tubercle.
Scutellum transverse. Elytm expanding very slightly before middle, thence nrcuatdy
narrowed to apices, which afe separately rounded; disk on basal half with
sparse, moderate-sized, simple punetUfes, basal gibbosities broad, feebly elevated;
humeri prominent, with an obtuse, slightly elevated tubercle at angle followed by
a very short carina on basal fifth. Prosternum simple, slightly widened behind
middle ; mesosternal process broad, deeply, bilobedly emarginate. Legs moderate
in length ; procoxae globose, strongly uncate in male; femora robust, gradually
clavate from basal third; metatibiae strong dilated apically in male. Antennae
one-third longer than body in male; scape robust, reaching nearly to middle of
pronotum, strongly clavate on apical third; third segment bisinuate, slightly longer
than scape; rest gradually shorter (eleventh segment wanting).
G.KNO'L'YPE.-Hypsioma amazonica Thomson.
Tulcus amazonica Thomson
PLATE IX, FIGURE 13.
Hypsioma am4zomca Thomson, Class. Ceramb., 1860, p. 119. Bates, Ann. Mag.
Nat. Hist., (3), XVI, 1865, p. III (sep. p. 178).
MALE. Elongate-ovate, robust, subcylindrical; head and pronotum piceous or
black; clytm dark reddish-brown. Head and pronotum grayish-fulvous pubescent,
a short, oblique, yellowish-white vitro on gena below lower lobe of eye; pronotum
basally with irregular, dull ochraceous patches. Scutellum medially broadly brown,
sides narrowly fulvous. Elytra brownish-fulvous, mottled very irregularly and indistinctly
with grayish-fulvous, and with a narrow, oblique, very indistinct vitta
from just behind humeri to behind middle at suture, of same color. Beneath dark
reddish-brown, sterna fulvous-gray pubescent; abdomen very finely dark brown
pubescent, laterally broadly fulvous pubescent except on first sternite, which has
only a very small maeula laterally on apical margin. L-egs piceous or dark roodishbrown,
dark brown pubescent, variegated with fulvous and gray pubescence; femora
with a narrow, fulvous fascia at apex; tarsi and tarsal claw segmcnt fulvous-gray