38 
the muzzle also is much more obtuse. The genus^ in fact, forms 
a connecting link between the Acanthoderitse and the Acantho- 
cinite, the chief character of the latter group being the great 
length of the basal joint of the antennse, which exceeds that of 
the third. The other characters of Alphus which require men- 
tion are the sockets of the fore haunches, which in most of the 
species are angulated exteriorly; the fore tarsi, which are not 
dilated in the male ; and the mesosternum, which is much nar- 
rowed behind, as in Myoxinus. As the genus is very imperfectly 
known at present, I add a list of all the described species, in- 
cluding those introduced in the present memoir. 
1. A. leuconotus, Thoms. Classif. p. 10, = sellatuSy Dej. Cat. sec. 
Ghevrolat. South Brazil. 
2. A. puhicornis, Serville. South Brazil. 
Oreodera pubicornis, Serv. Ann. Soc. Ent. Fr. iv. p. 21. 
jEgomorphus pubicornis, White, Cat. Long. Col. Brit. Mus, 
3. A. centrolineatuSy n. sp. Amazons and Venezuela. 
4. A. senilis j n. sp. Amazons. 
A. scutellaris, n. sp. Amazons. 
6. A, canescens (Dej. Cat.?), n. sp.* South Brazil. 
7. A. tuber osus, Germar. 
Lamia tuberosa, Germ. Ins. Sp. nov. p. 4/7» 
8. A. suhsellatus, White. 
Alphus suhsellatus. White, Cat. Long. Col. Brit. Mus. p. 375. 
The ^dilis griseo fascial a of Serville, included by White in 
this genus, does not belong to it. Its proper position, as shown 
by the length of the basal joint of the antennae and other cha» 
racters, is amongst the Acanthocinitae. 
1. Alphus centrolineatuSf n. sp. 
A. oblongus, modice convexus, fusco-ferrugineus, tomeiitosus, pilis 
cerviiiis passim vestitus : thorace fusco bilineato ; elytris punctatis, 
punctis setiferis, apice oblique truncatis, apud medium linea abbre- 
viata, suturali, communi, fusca ornatis. Long. 5 lin. ^ $ . 
Head moderately broad, tomentose. Antennae in both sexes 
* Alphus canescens, n. sp.— Oblongus, antice leviter attenuatus, tomento 
cinereo-olivascente vestitus. Caput parvum, fronte inter antennas 
concava. Antennae corpore duplo longiores, infra dense ciliatae, 
canescentes, articulorum apicibus nigris.' Thorax grosse punctatus, 
supra breviter tricarinatus. Elytra grosse irregulariter punctata, 
olivascentia, apud medium canescentia, apicibus breviter truncatis, 
carinis centro-basalibus parum elevatis postice prolongatis. Subtus 
niger, pilis cinereis vestitus. Pedes cinereo-pubescentes. Long. 7 hn. 
Rio Janeiro. 
