CYCLOCEPHALA— DYSCINETUS. 311 



to angle with the angles well-marked, instead of being a curved sinus in the middle with 

 the angles rounded. The mandibles are remarkably small and much shorter than the 

 clypeus ; on dissection they are found to be closely applied to the roof of the mouth. 



35. Cyclocephala ampliata. 



Bobusta, praacipue elytris late quadrato-ovatis, castaneo-rufa, polita, elytris (sutura excepta) fulvis ; clypeo 

 magno subquadrato, antice perparum angustato, angulis anticis acutis margineque antico acute reflexo 

 valde flexuoso ; tnorace quam elytra multo angustiore, rotundato convexo, angulis posticis distinetis sed 

 obtusissimis, basi marginato, toto sparsiru punctulato ; elytris subtilissime sparsim punctulatis et 

 geminato-striatis ; pygidio convexo, sat dense setifero-punctato. c? . Tibiae anticae apice acute bidentatae, 

 denteque tertio subobsoleto supra renioto ; tarsi antici ungue majore fisso; mandibulae quam clypeus 

 multo breviores, acuminatae, baud recurvae. Ligula late concava, antice leviter rotundata, integra. 

 Antennae lO-articulatae. 



Long. 23 millim. 6 • . 



Hab. Nicaragua, Chontales {Belt). 



Two damaged male examples. 



36. Cyclocephala ? 



Hab. Nicaragua (Salle). 

 A single female example. 



Species incertce sedis. 



DYSCINETUS. 



Dyscinetus, Harold, Col. Hefte, v. p. 123 (1869). 



Chalepus, MacLeay, Horse Ent. i. p. 149 (1819) ; Bnrmeister, Handb. der Ent. v. p. 75 ; Lacor- 

 daire, Gen. Col. hi. p. 403 (partim) (nom. praeocc., Thunberg, 1805). 



Upwards of twenty species of this exclusively American genus have been recorded. 

 Although chiefly tropical a few are found in the warmer temperate zone both north 

 and south. 



Some of the species greatly resemble certain forms of Hydrophilidse, e. g. Hydrocharis. 



l. Dyscinetus laBvipunctatus. 



Dyscinetus trachypygus (partim), Burm. Handb. der Ent. v. p. 79 \ 



Hab. Mexico 1 , Cordova, Toxpam (Salle), Paso del Macho, Paso de San Juan, 

 Acapulco (Hoge), Teraax in North Yucatan (Gaumer) ; British Honduras, E. Sarstoon 

 (Blancaneaux) ; Guatemala, Paso Antonio (Champion) ; Nicaragua (Salle), Chontales 

 (Janson) ; Panama (Boucard). 



Closely allied to J), dubius (Oliv.) of Cayenne, from which it differs in its narrower 

 oblong form and in the pygidium being throughout confluent-punctate in both sexes ; 

 the four costse on each elytron are also broader and flatter and the interspaces less 

 numerously punctured. In the broad apex and narrow reflexed margin of the clypeus 



