30 
dusky, the latter shining. The fore tarsi of the cf are broadly 
dilated and densely fringed. The opposing faces of the sterna 
are vertical and bituberculate. 
At Ega, on severed and hanging woody lianas in new clearings. 
I consider it a local variety of the following, from which it differs 
in the more vivid coloration. 
17. Acanthoderes lotor. White. 
Acanthoderes lotor, White, Cat. Long. Col. in Brit. Mus. ii. p. 362. 
The shape, sculpture, form of sterna, &c., are precisely the 
same as in -^4. chrysopus. I met with it only at Carepi, near 
Para. 
18. Acanthoderes lateralis j n. sp. 
A. modice elongatus, subdepressus, postice attenuatus, tomentosus, 
cinereo-brunneus, thoracis lateribus, maculisque duobus elytrorum, 
altera magna triangular! pone medium, altera parva prope apicem 
seepe obsoleta, fuscis : elytris apice truncatis, angulis externis spina 
longa armatis. Long. 6-8 lin. S 2 • 
Head sooty-black, front and vertex ashy-brown. Antennse 
about as long as the body, dusky, the third joint ringed with 
grey, 4-11 joints at the base testaceous grey. Thorax with the 
lateral tubercles prominent and acute, the dorsal ones prolonged 
into ridges, the dorsal line also forming a narrow ridge generally 
denuded ; interstices punctured, ashy-brown, the sides sooty- 
black. Elytra narrowed to the apex, which is briefly truncate, 
the external angles being produced into long spines ; the centro- 
basal ridges are feebly raised at the base, but prolonged behind 
each as a flexuous carina, which subsides at two-thirds the length; 
the basal half is rather thickly granulate-punctate ; in colour they 
are ashy-brown, with a large triangular spot on the side behind 
the middle, and a small irregular one near the tip, silky dark 
brown. Beneath and legs black, clothed with ashy pile ; tibiae 
with two pale rings. The fore tarsi of the S are widely dilated 
and densely fringed. The prosternum is simply rounded, the 
mesosternum steeply inclined in front and bituberculated. The 
terminal joints of the male antennae are moderately slender and 
ciliated beneath. 
This is a common species throughout the Amazon region, on 
felled trees in the forest ; it is also common, apparently, in 
French Guiana. I have seen it in collections under the name of 
A. later aliSy Hej., which appellation I have adopted. A. Jaspi- 
deus, Gerrnar (Sp. Nov. p. 475), and A. consentaneus, Hej., ac- 
cording to specimens sent to me by M. Heyrolle of Paris, are 
closely allied to A. lateralis; but their pro- and mesosterna are 
strongly convex. Our species is also near A. satellinus, Erichs. 
