334 RHYNCHOPHORA. 
15. Rhyssomatus debilis, sp.n. (Tab. XVII. figg. 22, 224, ¢.) 
Oval, rather dull, piceous or rufo-piceous, the elytra slightly mottled with blackish, the antenne and tarsi 
ferruginous, finely pubescent. Head rugulosely punctate, the eyes very narrowly separated; rostrum 
stout, feebly curved, a little longer than the prothorax, rugosely punctate and finely carinate, the antenne 
inserted at about one-third from the apex. Prothorax strongly transverse, feebly rounded at the sides, 
narrowing from the base, constricted in front, closely, shallowly, obliquely strigose, without trace of a 
median carina. Elytra much wider than the prothorax, oblong-oval ; punctato-suleate, the interstices 
densely, very finely rugulose, 3, 5, and 7 narrowly costate throughout, and 8 and 9 also a little raised. 
Legs short, rather slender; intermediate and posterior tibie angulate externally; tarsal claws 
subapproximate. 
Length 3-3,5, breadth 13 millim. (<.) 
Hab. Mexico, Jalapa (Hége); Guatemata, El Jicaro in Vera Paz (Champion) ; 
Panama, Volcan de Chiriqui (Champion). 
Four specimens. A small species, with short, comparatively narrow, shallowly 
strigose prothorax, and dull, punctato-sulcate, oblong-oval elytra, the latter with the 
alternate interstices somewhat feebly costate from the base to the apex. It is most 
nearly allied to &. punctato-sulcatus. 
16. Rhyssomatus alternans, sp. n. 
Subrhomboidal, rather short, shining, rufo-piceous, very sparsely and finely pubescent. Head densely, 
rugulosely punctate, the eyes contiguous; rostrum stout, curved, longer than the head and prothorax, 
very sparsely, finely punctate, carinate at the base, the antennte inserted before the middle. Prothorax 
at the base twice as broad as long, conical, strongly constricted in front, closely, obliquely strigose, and 
also very finely punctate, the disc with a fine median carina, which does not reach the base. Elytra 
much wider than the prothorax,. narrowing from the prominent, rounded humeri; deeply punctate- 
striate, the punctures oblong in shape, the interstices slightly rugulose, 3, 5, 7, 9 sharply costate from the 
base to the apex, and 8 and 10 also costate at the base, the others flat. Anterior coxe widely separated. 
Legs comparatively slender ; intermediate and posterior tibie sharply angulate on their outer edge and 
ciliate thence to the apex. 
Length 32-4, breadth 25-24 millim. (<¢.) 
Hab. Panama, Volcan de Chiriqui 3000 feet (Champion). 
Three specimens, probably all males. The widely separated anterior coxe, the short, 
conical, obliquely strigose prothorax, and the punctate-striate elytra, with costate 
alternate interstices, sufficiently distinguish A. alternans. 
17. Rhyssomatus subcostatus. (Tab. XVII. figg. 23, 23a, ¢ .) 
Rhyssomatus subcostatus, Fahr. in Schénh. Gen. Cure. iv. p. 368". 
Hab. Mexico, Vera Cruz (coll. Chevrolat 1), Toxpam, Playa Vicente (Sad/é), Teapa 
(H. H. Smith), Jalapa (Hoge); Brirish Honpuras, Rio Hondo (Blancaneaua) ; 
GuATEMALA, Sabo in Vera Paz (Champion); Nicaragua, Chontales (Belt); Panama, 
Volcan de Chiriqui, Bugaba (Champion). 
In this insect the alternate elytral interstices are sharply costate at the sides and 
on the apical declivity, the elytra themselves being seriato-foveolate; the prothorax 
