longo et tertio paullo breviore, quarto secundo subseque longo, sat 

 incrassato, fusiformi. Pronotum longitudine média circiter dimidio 

 latius, marginibus lateralibus rectis. Gorium ($) apicem segmenti 

 quinti connexivi subbattingens. Plica sinuata segmenti sexti 

 ventris ($) fundo recta Lobus médius basalis genitalium ($) 

 segmento sexto medio 2/3 longior. Long. Ç 10.5 mill. 



Argentina (Chaco de Santiago del Estero, Rio Salado). 



Very distinct from al hitherto described species. 



N. B. The name Althos was proposed by Kirkaldy for M argus 

 Dall., which is said to be preoccupied. M argus is one of the 

 numerous nomina nuda in Dejean's Catalogue and lias, unless 

 I ara mistaken, never been described as a genus in Coleoptera. 



STENOGEPHALUS PILOSUS n. sp. 



Elongatus, subincano-albidus, modice dense nigro-punctatus, 

 parce semierecte pilosus, pilis capitis et pronoti longioribus, 

 erectis, illo subtus pectoreque glabris, capite, fascia subimpressa 

 pronoti latera haud attingente mox pone collare ac pectore, exceptis 

 limbo postico propleuree et metapleurœ acetabulisque, nigris, abdo- 

 mine fusco, vitta dorsali latiuscula basin et apicem non attingente 

 pallide ilavo-testâcea, margine angusto laterali segmentorum trium 

 primorum connexivi, macula elongata basali-laterali segmentorum 

 hujus trium ultimorum, in segmento ultimo latiore et multo bre- 

 viore, guttulisque sparsis connexivi supra et subtus albidis, ventre 

 pube sericea albida locis compluribus in lineas longitudinales inter- 

 ruptas congesta vestito, utrinque nonnihil intra spiracula maculis 

 oblongis denudatis nigris seriatis, duabus in quoque segmento 

 (una basali, altéra mox pone médium), prsedito, capite, fascia 

 subapicali pronoti abdomineque impunctatis. Caput pronoto paul- 

 lulo longius, jugis spatio inter oculum et basin antennarum dis- 

 tincte longioribus, médium articuli primi antennarum attingen- 

 tibus, oculis eodem spatio paullo brevioribus, e supero visis 

 oblongis, modice convexis, parte postoculari anteoculari sine jugis 

 subaeque longa, ocellis inter se quam ab oculis longius distantibns, 

 rostro toto breviter piloso, coxas posticas attingente, articulo tertio 

 secundo breviore et quarto longiore, articulis duobus primis flavo- 

 testaceis, duobus ultimis fuscis, antennis fuscis, articulo primo sat 

 dense piloso, secundo albido-flavente, maculis punctiformibus 

 fuscis consperso, basi anguste et apice latiuscule fusco, pilis latitu- 

 dini articuli subseque longis pilis paucioribus fere triplo longioribus 

 intermixtis vestito, articulo tertis et quarto basi sat late albidis, 

 illo basin versus sensim leviter angustato, pilis latitudine articuli 



