302 RHYNCHOPHORA. 
broad, short prothorax, which is narrowed from the base and abruptly constricted in 
front, and the short, subcordate, seriato-foveolate elytra. 
11. Rhyssomatus biseriatus, sp. n. 
Oval, shining, black, the antenne and tarsi obscure ferruginous, very finely and sparsely pubescent. Head 
densely, rugulosely punctate, the eyes narrowly separated; rostrum stout, feebly curved, about as long as 
the head and prothorax, closely, rugulosely punctate, becoming smoother towards the tip, feebly carinate 
at the base, the antenne inserted at the middle. Prothorax at the base twice as broad as long, gradually 
narrowing forwards and abruptly constricted in front; coarsely, closely, obliquely strigose and with an 
incomplete median carina. Elytra wider than the prothorax, narrowing from a little below the humeri; 
seriato-foveolate, the interstices almost smooth, 3, 5, 7, 9 sharply costate from the base to the apex, and 
8 and 10 costate at the base, the suture also raised. Legs stout; intermediate and posterior tibie sharply 
angulate externally and ciliate thence to the apex. 
Length 54-53, breadth 24 millim. ( 2.) 
Hab. Mexico, Tapachula (Sallé); Guarmmata, Las Mercedes (Champion).. 
Two females, both from the Pacific slope. This species resembles JZ. acutecostatus 
in the elytral sculpture, but has the prothorax shaped very much as in R. yucatanus, 
with the coarse strigosity oblique, instead of longitudinal. The very sharply costate, 
glossy elytra, and the differently shaped, coarsely sculptured prothorax, separate it 
from R. sculpticollis, R. sculpturatus, &c.; and the narrower general shape, the non- 
contiguous eyes, and the more coarsely sculptured prothorax, from £. laticollis. 
12. Rhyssomatus sculpticollis, sp.n. (Tab. XVII. figg. 21, 214, ¢.) 
Oblong-oval, dull, piceous or black, the elytra often mottled with rufo-piceous, the antennz and tarsi obscure 
ferruginous, sparsely clothed with ochreous pubescence. Head densely, rugulosely punctate, the eyes 
very narrowly separated ; rostrum (3) feebly curved, stout, nearly as long as the head and prothorax, 
rugulosely punctate and obsoletely pluri-carinate, (2 ) much smoother, the antenne inserted at the middle 
in the @ and a little before the middle in the ¢. Prothorax strongly transverse, ronnded at the sides, 
narrowing forwards, constricted in front; closely, obliquely strigose, and with a fine median carina, which 
does not reach the base. Elytra wider than the prothorax, gradually narrowing from a little below the 
humeri; punctate-striate, the strie shallow, but becoming deeper towards the apex, the punctures coarse 
and oblong, the interstices somewhat rugulose and very sparsely, obsoletely granulate, 3, 5, 7,9 moderately 
costate from the base to the apex, and 8 also costate at the base, the others flat. Legs short ; intermediate 
and posterior tibize sharply angulate externally and ciliate thence to the apex. 
Length 4-64, breadth 2-33 millim. (¢ 2.) 
Hab. Mexico, Vera Cruz (Sallé, Hége), Puebla, Toxpam (Sallé), Jalapa, Tapachula 
(Hoge), Teapa (Hoge, H. H. Smith), Temax in N. Yucatan ( Gaumer); GUATEMALA, 
Coatepeque, Mirandilla, Zapote, Chiacam (Champion) ; Nicaragua, Chontales (Janson), 
San Marcos (Baker). 
Sent in numbers from Vera Cruz, Tapachula, Teapa, and Temax. This is one of 
several very closely allied forms with obliquely strigose pronotum (a character separating 
it from R. rugulipennis) and alternately costate elytral interstices, and chiefly distin- 
guishable by the sparse pubescence and the feebly rugulose elytra. Compared with 
the North-American R. palmacollis (Say), it may be recognized by its more oblong 
