ASPIDOLEA.— ANCOGNATHA. 297 



Hab. Guatemala, Volcan de Atitlan {Champion) ; Nicaragua, Chontales (Belt, Janson); 

 Panama, Volcan de Chiriqui 2500 to 4000 feet (Champion). 



A Guatemalan specimen is figured. 



ANCOGNATHA. 



Ancognatha, Erichson in Wiegm. Archiv fiir Naturg. 1847, p. 97. 



Cyclocephala, § 2 {Cyclocephala acuta), Burmeister, Handb. der Ent. v. p. 39 (1847) (partim). 



This genus has been too hastily rejected by authors subsequent to Erichson. Its 

 structural differences from Cyclocephala are of much significance. The labrum is 

 detached and inclined from the roof of the mouth, instead of being hidden as in 

 Cyclocephala with at most a very short margin exposed under the clypeus, and its apex 

 in the typical species is toothed ; and the ligula is divided into two narrow lobes with 

 a narrow depression at its base extending far down the mentum. 



These characters, though the form of the mentum was incomprehensibly misstated, 

 apply to Erichson' s type, A. scarabceoides, and to C. ustulata and C. humeralis of 

 Burmeister, but not to C. ocellata and C. maculata, which the latter author includes 

 in the same section. They apply also in all probability to A. lutea of Erichson, and to 

 A. jamesoni and A. crassimana of Murray, and without doubt also to C. manca of 

 Leconte. The acuminated clypeus and the narrow pointed mandibles bent upwards 

 from the edge of the clypeus are characters less distinctive of the genus, being shared 

 by species of the first section of Cyclocephala ; the clypeus is inconstant in shape, that 

 of the female of A. qiiadripunctata being obtusely semiovate. 



1. Ancognatha sequata. (Tab. XVII. fig. 12, c? .) 



A. scarabceoidi proxime affinis ; supra complanata, piceo -nigra, nitida, corpore subtus, pygidio et femoribus fulvo- 

 testaceis, ventre segmentis l°-5 m medio infuscatis, pectore rufo-birto ; capite sparsim tborace multo subtilius 

 et sparsius punctulatis, clypeo apice minus acuto et parum reflexo ; elytris fere toto lsevibus, medio versus 

 basin tantum striato-punctulatis, stria suturali nulla. Pygidium setifero-punctulatum. d . Tarsi antici 

 articulo unguiculari parum incrassato, ungueque majore elongato sat gracili. 



Long. 18 millim. <S . 



Hab. Mexico, Ciudad in Durango (Forrer). 

 Two male examples. 



2. Ancognatha laevigata. 



A. scarabceoidi simillima, paullo convexior, corpore toto cum pedibus nigris, antennis palpisque rufls ; elytris 



parum conspicue striato-punctulatis ; pygidio polito, fere lsevi, punctulis paucis setiferis. 

 Long. 17-19 millim. 



Hab. Mexico (Salle, ex coll. Sturm), Tenancingo (Flohr). 



Two examples. The clypeus curves on each side gradually to a point, but the point, 

 biol. ceste.-amee., Coleopt, Vol. II. Pt. 2, October 1888. 2 QQ 



