43 
clothed with light-brown pile, the sides with a stripe of a colFee- 
brown colour between the lateral keel and the tubercles. Elytra 
depressed, elongate, subtrigonal ; the centro-basal ridges pro- 
longed behind to the apex, gently curved outwards and granu- 
lated from the base to two-thirds the length, then flexuous and 
smooth to their termination : the surface faintly and sparingly 
granulate-punctate, with a few large granulations, besides, on 
the shoulders ; light or tawny-brown in colour, with a silky 
gloss ; the sides have each two large irregular patches of a coffee- 
browm colour, one covering the shoulder and extending in a 
short streak to the disk, the other placed obliquely a little be- 
hind the middle ; the apex of each elytron is produced into a 
spine. Body beneath thickly clothed with ashy-brown pile; 
the middle of the abdomen shining black. Legs thinly covered 
with ashy-brown pubescence. 
One example, taken at Oyaya, banks of the Curua, below 
Santarem. 
The species is nearly allied to St. melanogenys, but differs in 
the shape and position of the spines beneath the third antennal 
joint, in its clothing and markings, and in the apex of the elytra 
not being squarely truncated with a spine at the external angles, 
but produeed on each elytron into a stout spine, 
4. Steirastoma cethiops, n, sp. 
St. modice elongatum, depressum, supra tomento atro-griseo vesti- 
turn : capitis thoracisque lateribus et plagis magiiis duabus ely- 
trorum nigris : elytris apice valde spinosis. Long. 8-10 lin. S $ . 
Head and labrum clothed with very dark-grey pile, the former 
with three longitudinal raised lines on the front, the central one 
extending to the nuchus, the lateral ones short and very promi- 
nent ; sides black. Antennae black; bases of the joints greyish, 
the third with a few very fine spines or bristles beneath, placed 
wide apart; the basal joint in the 6 pyriform-clavate, smooth. 
Thorax quadrituberculate on each side, the lateral prominence 
very large, trituberculate, the tubercle near the fore angle pro- 
minent ; the dorsal surface depressed, punctured, tricarinate ; 
the central keel very faint, the lateral ones strongly pronounced ; 
thickly clothed with very dark-grey pile, the sides each with a 
black stripe between the lateral keel and the tubercles. Elytra 
depressed, elongate, subtrigonal ; the centro-basal ridges pro- 
longed behind to the apex, strongly curved outwards, and granu- 
lated to two-thirds the length, then flexuous and smooth to their 
termination ; the surface faintly and sparingly granulate-punc- 
tate, with a few large granulations, besides, on the shoulders; 
very dark grey, the sides having each two large, irregular, black 
patches — one, wLich is sometimes broken into smaller spots. 
