of the Amazon Valley. Til 



Genus Atharsus. 



Bates, Entom. Monthly Mag. iv. 25 (1867) ; Lacord. 

 Gen. viii. 323. 



Lacordaire suggests that Burmeister's 8phcerion rnstl- 

 cum may be closely allied to Atharsus; but I have no 

 doubt, from Burmeister's description, that his insect is 

 a true Sphcerion, 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 

 antennae 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 

 tibige . 



1. Atharsus nigricauda, Bates, loc. cit. 



Brevis, depressus, rufo-testaceus, vix nitidus, pube 

 subtili cinerea indutus, haud pilosus, elytris, capite 

 antice, antennis, quinta parte apicali elytrorum, et pedi^ 

 bus nigris ; antennis sjDarsim subtus cilia tis. 



Long. 5 lin. (J . 



Hab. — Tapajos. 



Genus Terpnissa. 



Bates, Entom. Monthly Mag. iv. 25 (1867); Lacord. 

 Gen. viii. 324. 



Elongata, sublinearis, opaca, sparsim hirsuta. Caput 

 antice brevissimura, palpis maxillaribus valde elongatis : 

 antennis setaceis, corpore dimidio longioribus, articulis 

 3-5 unicarinatis, apice unispinosis. Thorax rotundato- 

 ovatus, latei'ibus medio angulatis, supra convexus, paulo 

 inaequalis. Elytra linearia, ante apiceip rotundata, deinde 

 breviter truncata, angulo externo spinoso, suturali haud 

 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 



