172 LAMELLICOENIA. 



piano, margine apicali integro. Ungues ante medium dentati, deinde usque ad basin denticulati. Variat 

 elytris valde pruinosis pygidioque glabro. 

 Long. 12-13 millim. 



Hab. Mexico, Villa Lerdo in Durango (Edge). 



Var. major $ . 17 millim. Capite thoraceque castaneo-fuscis. 



Hab. Mexico, Tapachula in Chiapas (Hbge). One example. 



6. Listrochelus parilis. 



L. scuticipiti proxime affinis : supra castaneus (thorace obscuriore et nitidissimo), elytris griseo-pruinosis, sub- 

 opacis, antennis pedibusque testaceo-rufis, pectore aureo-fulvo villoso : fronte sicut in L. scuticipiti plana 

 declivi, occipiteque transversim exarato-sulcato, lsevi, sed clypeo ampliore semicirculari, margine alte reflexo, 

 integro ; tborace subtiliter discrete punetulato (interdum in c? densius), vitta mediana leevi ; elytris punc- 

 tulatis et erecte birsutis. 



cJ . Pygidium mediocriter et praecipue prope basin convexum, disperse punctulatum, glabrum, margine apicali 

 subsinuatim et late truncatum. Venter medio segmentis 4° et 5° valde depressis, 2° et 3° medio pibfero- 

 punctatis, 5° et 6° glabris, canaliculatis. Ungues subtilissime denticulati, paullo post medium brevissime 

 dentati, apice subhamati. Antennarum clava articulis 2°-7 m conjunctis longior. 

 2 . Pygidium sicut in <5 • Tenter convexus ; segmento 5° dimidio apicali subito depresso, fere bevi ; segmento 

 6° convexo, setifero, punctato, apice integro. Antennarum clava sat elongata, articulis 3°-7 m conjunctis fere 

 sequalis. Ungues post medium dentati, deinde ad basin denticulati. 



Long. 13-14 millim. 



Hab. Mexico, Refugio and Ciudad in Durango (Edge). 



The similarity between the two sexes in nearly all the usual differentiating characters 

 distinguishes this species in a singular manner from its congeners. 



7. Listrochelus culminatus. 



Oblongus, subovatus, castaneo-rufus, glaber ; clypeo semicirculari, margine alte refiexo, antice medio depresso vix 

 sinuato ; fronte brevi, subverticali, postice culmine alto dense tuberculato delimitato, confertissime grosse 

 punctato et piloso ; occipite late transversim depresso, medio polito, lateribus punctatis ; thorace post medium 

 rotundato-dilatato, angulis anticis rotundatis, posticis obtusis, supra sat dense punetulato, spatio discoidali 

 Levi ; elytris discrete punctulatis, costis sutorali et discoidali (obliqua) sat eievatis. 



2 . Pygidium elongatum, recte angustatum, apice truncatum, planum vel medio paullo depressum, basi sparsissime 

 apice dense pilifero-punctatis. Venter medio subglaber, segmento 6° setifero-punctato, apice integro. 

 Ungues dente valido haud procul ab apice, deinde usque ad basin dilatati et denticulati. 



Long. 16 millim. 



Hab. Mexico, Matamoros Izucar in Puebla, Jalapa (Hbge). 

 Only two examples, both females, and exactly similar. 



8. Listrochelus maximus. (Tab. X. fig. 6, e .) 



Magnus, robustus, fulvo-testaceus (pedibus rufioribus), supra sat dense punctulatus et recumbente breviter griseo 

 " pilosus, apud frontem, tboracem elytrorumque basin, pilis longioribus erectis intermixtis ; capite grosse 

 confluenter punctato, clypeo brevi, obtuse rotundato, margine alte reflexo, integro ; tborace paullo post 

 medium dilatato, angulis anticis acutis, margine crenato. 

 tf . Pygidium planum, margine apicali alte acute reflexum, dense punctulatum, pilosum, opacum. Venter medio 

 longitudinaliter concavus, punctulato-pubescens, opacus ; segmento 5° medio densissime punetulato, sub- 

 nitfdo, margine apicali valde flexuoso medio producto, 6° medio transversim concavo, margine anteriore 



