277 
of the Amazon Valley, 
Genus Atharsus. 
Bates, Entom. Monthly Mag. iv. 25 (1867) ; Lacord. 
Gen. viii. 323. 
Lacordaire suggests that Burmeister^s Sphcerion rusti- 
cum may be closely allied to Atharsus ; but I have no 
doubt, from Burmeister’s description, that his insect is 
a true SphcerioUj and near my Sph. callidioides. Atharsus 
differs in having a slight trace of the antennal grooves 
only on the third joint, and in the absence of spines at 
the apex of the elytra. The third to fifth joints of the 
antenna3 have a short spine at the apex. The great 
relative length of the maxillary palpi, and the depressed 
form of body, with its clothing of excessively fine ashy 
pile, show a close relationship to Sphcerion proper. The 
femora are very gradually clavate, and unarmed at the 
tips. There is only a feeble trace of carina on the hind 
tibiae . 
1. Atharsus nigricauda, Bates, loc. cit. 
Brevis, depressus, rufo-testaceus, vix nitidus, pube 
subtili cinerea indutus, hand pilosus, elytris, capite 
antice, antennis, quinta parte apicali elytrorum, et pedi- 
bus nigris ; antennis sparsim subtus cilia tis. 
Long. 5 lin, d' • 
Hah. — Tapajos. 
Genus Terpnissa. 
Bates, Entom. Monthly Mag. iv. 25 (1867); Lacord. 
Gen. viii. 324. 
Elongata, sublinearis, opaca, sparsim hirsuta. Caput 
antice brevissimum, palpis maxillaribus valde elongatis : 
antennis setaceis, corpore dimidio longioribus, articulis 
3-5 unicarinatis, apice unispinosis. Thorax rotundato- 
ovatus, lateribus medio angulatis, supra convexus, paulo 
inaequalis. Elytra linearia, ante apicem rotundata, deinde 
breviter truncata, angulo externo spinoso, suturali hand 
producto. Prosternum inter coxas angustissimum, coxis 
orbiculatis; mesosternum latum, acetabula clausa. Pedes 
elongati, femoribus clavatis, pedunculatis, apice inermi- 
bus ; tibiis compressis, vix perspicue intus sulcatis ; tarsis 
brevissimis. 
TRANS. ENT. SOC. 1870. PART III. (AUGUST.) 
X 
