20 Mr. H. W. Bates on the Longicorn Coleoptera 
I met with a few examples only of this species in the dry 
woods near Santarem, at the mouth of the Tapajos. 
Genus XYLERGATEs, Nov. gen. 
Body oblong, robust. Antenne stout, moderately elongated, 
sparingly furnished with short bristles beneath. Thorax tuber- 
cular on the disk; lateral tubercles large and placed near the 
middle of the sides. Elytra much broader than the thorax, 
their deflexed sides broad and vertical, but not separated from 
the dorsal surface by smooth keels; surface costate and rough- 
ened by small tubercles surmounted by short bristles ; apices 
truncated. Sterna narrow. Terminal abdominal segment in 
the males with dorsal and ventral plates notched. Ovipositor 
of the females moderately elongated, conico-tubular; dorsal 
plate obtuse, ventral truncated. Legs stout; thighs thickly 
clavate ; fore and middle tarsi dilated in the males; first jomt of 
the hind tarsi about equal to the two followmg taken together. 
The robust forms and tubercular thoraces of the species com- 
posing this genus give them a strong general resemblance to 
the Acanthoderes ; they are distinguished, however, by the elon- 
gate gradually thickened basal joint of the antenne, the closure 
of the anterior acetabular sutures, the ovipositor of the females, 
and other characters. The genus is very closely related to 
Eutrypanus, no constant mark of difference existing other than 
the absence of smooth lateral keels proceeding from the shoul- 
ders of the elytra. From Acanthocinus it is distinguished by the 
high vertical sides of the wing-cases, the tuberculose surface of 
the body, and the dilated anterior and middle tarsi of the males, 
Xylergates lacteus, n. sp. 
X. oblongus, supra planiusculus, postice sensim attenuatus, brunneo 
sericeus : elytris strigis curvatis lacteis plagas griseas includentibus, 
apice sinuato-truncatis, angulis exterioribus productis. Long. 63- 
fline= SQ. 
Head tawny brown. Antenne ringed with grey and black. 
Thorax with large obtusely conical lateral tubercles near the 
middle of the sides, and with two obtuse tubercles on the fore 
part of the disk, besides three other smaller ones on the poste- 
rior part; surface purplish brown, silky, sides below the tuber- 
cles ashy. Elytra broad and straight at the base, thence gradu- 
ally narrowed to the apex, which is somewhat broadly sinuate- 
truncate, the external angles of the truncature produced; de- 
fiexed sides (towards the base) thickly granulate-punctate ; sur- 
face with numerous small punctures towards the base, and with 
four or five interrupted rows of acute blackish tubercles sur- 
mounted by short bristles, the middle ones lying along the faint 
