150 . LAMELLICOEXIA. 



9. Isonychus paradoxus. (Tab. IX. fig. 15, <? ) 



Oblongus, minus convexus, aenescenti-fuscus, pilis brevibus adpressis fulvis passim interruptis vestitus, setulis 

 brevibus suberectis intermixtis ; antennis, femoribus tarsisque rufescentibus ; clypeo sicut in I. ocellato, 

 angulis rotundatis ; thorace subtiliter crebre punctulato ; elytris interstitiis alternis convexis, interstitiis 

 planis 2°-4° et 8° macnlis nonnullis fusco-nigris, velutinis, callo apicali valido ; corpore subtus fere glabro, 

 ventris segmentis basi nigricantibus, cinereo-maculatis ; pygidio brevi, piloso, vitta mediana glaberrima. 



Tibiae 4 posteriores, sicut in Hopliis plurimis, serratis sed gracilioribus. 



c? . Ventris segmentum 5 m medio transversim depressum, umbiiicato-punctulatum ; tibise postieae apice uni- 

 calearatse. 



Long. 11 millim. 



Hab. Panama, Volcan de Chiriqui 4000 to 6000 feet (Champion). 



Two males only. The tarsal claws in this anomalous species are stronger and 

 more curved, and the parts of the mouth more robust and prominent than in the other 

 known members of the genus. 



BARYBAS. 



Barybas, Blanchard, Cat. Coll. Ent. i. p. 94 (1850); Lacordaire, Gen. Col. hi. p. 260 (1856). 

 Microcrania, Burmeister, Handb. der Ent. iv. 2, p. 26 (1855). 



Burmeister (I. c. p. 536) shows that the first of Blanchard's two species, B. variegatus, 

 Germ., is wrongly named, being an Isonychus, and thinks that his second, B. nanus, 

 does not belong to the genus, but is synonymous with his Hercitis pygmwa. There 

 is room to doubt the latter identification ; and Blanchard's phrase, " ungues— posticorum 

 — externo majore simplici interno fisso," may be regarded as sufficient to fix the genus, 

 in spite of the incompleteness of the whole diagnosis. Lacordaire's definition fills up 

 the lacunes in Blanchard's, but is some months posterior in date to the still better 

 description of Burmeister. 



The genus is peculiar to Tropical America, and numerous in species, though barely 

 half a dozen are yet described. It is interesting as showing a relationship to the 

 Hopliinee. 



1. Barybas auritus. (Tab. IX. fig. 16.) 



Oblongus, fuscus sive castaneus, squamulis anguste lanceolatis fulvo-cinereis fere in vittas subcongestis vestitus ; 

 clypeo brevi, antice latissime truncato rectangulato, utrinque pone angulum sinuato genisque lobato- 

 productis ; thorace sequaliter convexo, lateribus simpliciter rotundatis, angulis posticis rotundatis, umbili- 

 cato-punctato ; elytris umbone juxta-scutellari callisque apicalibus mediocribus, his squamis fasciculatis 

 subtiliter discrete striguloso-punctulatis ; pygidio eleganter umbilicato-punctato ; antennis pedibusque 

 rufescentibus. 



Tibia3 anticas <3 bi-, $ tridentatse. 



Long. 6-7| millim. 



S. Tarsi anteriores articulo basali apice intus spina recurva armato; pygidio asqualiter convexo. 



5 . Tarsi anteriores inermes ; pygidio insequali, utrinque tuberoso. 



Eab. Panama, David, Caldera in Chiriqui (Champion). 



