360 Mr, G, C. Champion on the Tenebrionide: 
Opatrum walkeri, n. sp. 
Moderately broad, subparallel, not very convex, black or brown- 
ish-black, opaque, clothed with a short, fine, decumbent, greyish 
pubescence, which is usually hidden by an adherent earthy coating. 
Head rather broad, deeply sunk into the prothorax, the sides of the 
front broadly, obliquely, subangularly dilated (forming almost a 
continuous outline with the sides of the prothorax) and extending 
far beyond the eyes laterally, and about half-way across them 
posteriorly, the epistoma deeply triangularly emarginate in front 
and limited behind by a fine groove, the surface densely, roughly 
punctured ; antenne short, not reaching the base of the prothorax, 
joints 8-10 strongly transverse ; prothorax twice as broad as long, 
feebly convex, broadly explanate at the sides, widest at the middle, 
broadly and deeply emarginate in front and bisinuate at the base, 
the sides strongly rounded at the middle, rather obliquely converg- 
ing in front, and constricted behind, the hind angles acute, the 
anterior angles rather sharp, the surface densely, rugosely punc- 
tured, the interspaces finely granulate and very minutely punctate, 
the disc with traces of a fine median groove ; elytra about three 
and a half times the length of, and at the base a little wider than, 
the prothorax, subparallel in their basal half, trisinuate at the 
base, with prominent rectangular humeri, closely and moderately 
coarsely punctate-striate, the interstices densely, very minutely 
punctate, granulate, and rather convex, the third, fifth, and 
seventh a little more raised than the others ; the legs and under 
surface densely, roughly punctate and pubescent ; anterior tibiz 
gradually widened to the acute outer angles; anterior tarsi 
sparsely clothed with rather coarse hairs beneath; wings fully 
developed ; the ventral segments 1-3 depressed along the middle in 
the male. Length 73—91, breadth 33—43 mm. 
Hab. N. W. Australia—Adelaide River. 
Found in plenty by Mr. Walker. This species may 
chiefly be recognized by the explanate rounded margins 
of the prothorax and the rather convex elytral interstices, 
the third, fifth, and seventh a little more raised than the 
others. In dirty specimens the minute dense punctu- 
ation of the surface is completely hidden, and the granu- 
lations are more distinct. O. walkeri is closely allied to 
O. moluccanum, Blanch., numerous specimens of which 
were obtained by Mr. Walker at the Islands of Amboyna 
and Damma. 
