136 LONGICORNIA. 
ALPHUS. 
Alphus, Thomson, Class. Long. p.10; Bates, Ann. & Mag. Nat. Hist. ser. 3, ix. p. 121; Lacordaire, | 
Gen. Col. ix. p. 741. . 
Nine species of this distinct genus have been described, all Tropical-American. It is 
a form which, with Myoxinus and allied genera, bridges over the interval between the 
two groups Acanthoderini and Acanthocinini, the antennal scape being less evenly 
clavate, with a tendency to flexuous outline of the under surface. 
1. Alphus cavifrons. (Tab. X. fig. 15.) 
Alphus cavifrons, Bates, Trans. Ent. Soc. 1872, p. 206°. 
Hab. Nicaragua, Chontales (Belt 1, Janson). 
Var. (Tab. XI. fig. 1.) 
Minor, rufescenti-fuscus (an immaturus?), thorace lateribus elytrisque, apice exceptis, cinereo-nebulosis, 
Long. 5 lin. 
Hab. Nicaracua, Chontales (Belt). 
2. Alphus centrolineatus. 
Alphus centrolineatus, Bates, Ann. & Mag. Nat. Hist. ser. 3, ix. p. 1227; id. Trans. Ent. Soc. 1872, 
p. 206 ?. | 
Hab. Nicaragua, Chontales ?7.—SoutH America, Amazons 1. 
MYOXINUS. 
Myoxinus, Bates, Ann. & Mag. Nat. Hist. ser. 3, ix. p. 120 (1862); Lacordaire, Gen. Col. ix. 
p. 742. 
Mysopsis, Thomson, Syst. Céramb. p. 16 (1864). 
Acanthoderes (partim), Erichson, Wiegm. Archiv, 1847, i. p. 144. 
There is little to distinguish this genus from Alphus, especially from the section having 
tuberculated basal crests on the elytra, The outline of the antennal scape is somewhat 
different, not being flexuous beneath near the apex; and another minor character is the 
bituberculated mesosternum. Four or five species are known in collections, all from 
Tropical America but only one has previously been described. 
1. Myoxinus pictus. (Tab. X. fig. 16). 
Acanthoderes pictus, Erichson, Wiegm. Archiv, 1847, i. p. 144°; Bates, Ann. & Mag. Nat. Hist. 
ser. 3, 1x. p. 1217; id. Trans. Ent. Soc. 1872, p. 206°. 
Hab. Nicaragua, Chontales (Belt 3, Janson).—Soutn America, Peru}, Amazons 2, 
2. Myoxinus asper. 
M. picto major, fuscus, macula communi elytrorum suturali antice utrinque ramum emittente posticeque 
dilatata obscure ochracea; antennis ochraceo-fuscis, articulis singulis nigro-biannulatis ; thorace dorso 
