RHYSSOMATUS. 337 
Three females and one male, agreeing very nearly with Dr. Horn’s description, and 
with two Texan specimens sent me by Mr. Wickham. The dilated tarsi, the sinuato- 
emarginate outer edge of the intermediate and hind tibie, and the very slender, curved, 
basally deflexed rostrum, readily distinguish R. pruinosus from its Central-American 
allies. According to Boheman!, the insect has an eneous lustre, but this is not visible 
in the specimens described by Dr. Horn 2, norin those before me. The three examples 
from Yucatan have the prothorax more coarsely punctured than the others. 
23. Rhyssomatus nigerrimus, (Tab. XVII. figg. 28, 28a, 2.) 
Rhyssomatus nigerrimus, Fahy. in Schénh. Gen. Cure. iv. p. 376". 
Hab. Mextco!, San Andres Tuxtla, Playa Vicente (Sallé), Vera Cruz, San Juan 
Bautista, Frontera (Hége), Acaguizotla, Atoyac, Teapa (H. H. Smith); Brivisu 
Hoypuras, Rio Hondo (Blancaneauz); Guatemata, La Tinta and Chiacam in Vera 
Paz (Champion); Panama, Bugaba, David, Caldera, San Feliz (Champion). 
In this insect the elytra, which are sometimes castaneous, are very coarsely seriate- 
punctate, with all the interstices costate towards the apex; the head is foveate between 
the eyes, which are widely separated ; the rostrum is depressed at the base above, long, 
curved, and slender; the prothorax in most of the Mexican specimens (as described 
by Fahreus) is densely, obliquely strigose, except along the smooth, narrow, median 
space, the sculpture becoming punctiform towards the middle of the disc, this being 
especially noticeable in the examples from Guatemala and Panama, which have the 
sides only strigose. The antenne are inserted somewhat behind the middle of the 
rostrum in both sexes. The mesosternum is protuberant in front. 
24. Rhyssomatus morio. (Tab. XVII. figg. 29, 29 a, 9; 29 6, interm. tibia.) 
Rhyssomatus morio, Ros. in Schénh. Gen. Cure. iv. p. 872°. 
Hab. Mexico, Cuernavaca (Sallé), Amula in Guerrero (H. H. Smith), between 
Oaxaca and Acapulco !. 
Easily distinguishable by its broad, oval form, the widely separated eyes, the long 
rostrum, and the densely punctured upper surface, the elytra finely punctate-striate, 
with flat interstices. The mesosternum is strongly protuberant in front. The inter- 
mediate and posterior tibiz are very sharply angulate on the outer edge before the 
apex. The antenne in the male are inserted at about the middle, and in the female 
much nearer the base, of the rostrum, which is slender, deflexed at the base above, and 
strongly curved in the female. The fifth ventral segment is deeply foveate in the 
middle in the male. Seven specimens have been received by us. 
25. Rhyssomatus viridipes. 
Rhyssomatus viridipes, Fahy. in Schénh. Gen. Cure. iv. p. 370". 
Hab. Mexico, Vera Cruz} (Mus. Holm.). 
BIOL, CENTR.-AMER., Coleopt., Vol. IV. Pt. 4, June 1904. 9 XX 
