10 PEOCEEDINGS OF THE NATIONAL. MUSEUM vol. 66 



The species is closely allied to hioqueti, described from Colombia by 

 Gory, but can be separated from that species by the pronotum not 

 narrower in front than behind, and the lateral margins of the elytra 

 entire posteriorly, and not serrate. 



CONOGNATHA AMOENA Kirby 



Conognatha amoena Kirby, Trans. Linn. Soc, London, vol. 12, 1818, p. 381. 



A single example of this beautiful species was collected at Rur- 

 reiiaocique (Beni River), during December, 1921. 



AUTARCHONTES LOPEZI, new species 



Form large, robust, and strongly shining; head cupreous, more or 

 less aureus on the front, and becoming purplish-red, with feeble 

 greenish reflection on the occiput; pronotum blackish-green, with 

 a distinct purpureous or violaceous tinge, especially toward the 

 sides; scutellum and elytra blackish-green, the latter with the apex 

 cyaneous, the sides feebly purplish, and each elytron ornated with 

 three small cinerous spots arranged in a straight line in the con- 

 cavity near suture, and located as follows: one just in front of mid- 

 dle, one at apical third, and the other near apex; beneath bluish or 

 greenish-black, with a strong purplish tinge, and the legs viola- 

 ceous ; tarsi and antennae piceous, with a feeble aeneous tinge. 



Head with the front rather wide, feebly convex, sides feebly arcu- 

 ately expanded near vertex, broadly and deeply depressed from occi- 

 put to epistoma, the depression becoming broader and more flattened 

 behind the epistoma; surface coarsely and rather densely punctate 

 on the front, (except behind the epistoma where it is finely, densely 

 punctate, and sparsely clothed with fine cinereous hairs), becoming 

 coarsely and more or less concentrically rugous on the occiput; 

 epistoma broadly and deeply arcuately emarginate in front, with a 

 large obtuse tooth on each side of the emargination ; antennae scarce- 

 ly reaching to middle of pronotum, and serrate from the fourth 

 joint. Pronotum one and one-third times as wide as long, base and 

 apex about equal in width, and widest at apical fourth ; sides feebly 

 arcuately expanded from apical angles to middle, then obsoletely 

 narrowed to near the posterior angles, where they are feebly ex- 

 panded, with the angles nearly rectangular; lateral margin when 

 viewed from the side strongly sinuate and the two margins sep- 

 arated ; anterior margin feebly arcuately emarginate, with a broadly 

 rounded median lobe; base feebly emarginate at middle of each 

 elytron with a broadly rounded median lobe, which is truncate in 

 front of scutellum; disk moderately convex, with two rather deep 

 depressions at the middle, the posterior one being broader and deeper, 

 and on each side with a deep elongate depression on the inner 

 side of the lateral carina, the carina distinct, and extending from 



