MALACODERMATA. 283 
25 (s). Chauliognathus exiguus. 
Nigro-fuscus nitidus ; ore et epistomate flavis, palpis rufo-piceis, prothorace flavo, disco obsoletius canaliculato 
utrinque tumido, postice nigro ; elytris nigro-fuscis, subnitidis, sutura margineque (basi excepta) tenuiter 
pallidis ; pedibus pallide flavis, tibiis ad apices tarsisque fuscis ; abdomine fusco, segmentis singulis margine 
laterali et apicali pallide marginatis. Long. 6-74 millim. ¢ 9. 
Mas. Segmento sexto ventrali valviformi fusco. 
Hab. Panama, Volcan de Chiriqui 3000 to 4000 feet (Champion). 
Var. Thorace rufo immaculato. @. 
Hab. Panama, Bugaba (Champion). 
A species which at first sight is more suggestive of a Discodon or Silis than of the 
genus to which it belongs. It is not unlike D. divittatwm; but if the long maxille 
reaching beyond the mandibles, the relative shortness of the third joint of the antenne 
(which is here not nearly so long as the fourth joint), and the claws which in the male 
are simple, and in the female the simple mandibles, are noticed, no confusion will arise. 
Only three specimens were captured ; the variety from Bugaba is singularly assimilated 
to species of Silis (such as S. yocosa and S. amicula) from the same place. The elytra 
in this species are (in the male) not shorter than the body, in the female only a very 
little shorter. 
30. Chauliognathus scutellaris. 
Chauliognathus scutellaris, Lec. Proc. Ac. Phil. vi. p. 230!; Trans. Amer. Ent. Soc. 1881, p. 44”. 
Chauliognathus basalis, Lec. Col. of Kansas and Eastern New Mexico, p.13°; Trans. Am. Ent. Soc. 
1881, p. 444 (nec Lacord.). 
Hab. Norvu America, Mexican boundary ', Texas, Fort Bridger, and in the Black 
Hills 2, Colorado, and Utah +.—Mextico (Sad/é), Monclova in Coahuila (Dr. Palmer). 
I have united these two species, for it seems to me that Leconte has placed too much 
reliance on colour. ‘This is often constant for limited localities, but of no use when 
extended districts are taken into account. 
The smooth and shining dise of the thorax distinguishes this from C. hastatus. The 
elytra are always neatly margined; the black portion varies from less than a half to 
three quarters of their length. The specimens in Sallé’s collection and one from 
Monclova have the thorax wholly yellow; some from Monclova have a triangular 
scutellar spot, others have a transverse bar on the base, most have a pentagonal mark 
occupying the disc of the thorax. The sides of the sterna are partly yellow. I have 
not found any examples in which the breast is wholly black. 
31. Chauliognathus limbicollis. 
Chauliognathus limbicollis, Lec. Proc. Acad. Phil. 1858, p. 71 *; Trans. Amer. Ent. Soc. ix. 1881, 
p. 44°. 
Hab. Nortu America, New Mexico, Texas, and Colorado ?2,—Mexico, Sonora ! (Schott, 
Morrison), Pinos Altos in Chihuahua (Luchan-Hepburn). 
202 
