the Hemiptera collected in the Amazons, ^^c. 271 



segmento primo ventrali inter coxas loiige promlnulo ; 

 aidotliecEe appendicibus corpore asquilongis. 



Long. 27 mm., lat. 2^ mm. 



Hah. — Lages, mouth of Kio Negro (August 3, 1874). 

 One specimen. 



Distinct fi-om the otlier described American species in 

 the form of the metasternum, more slender stature, &c. 



Fam. NOTONECTIDiE. 

 Anisops, Spin. 



16. A. amnigenus, n. sp. 



Sordide testaceo-albidus, lasvis, nitidus, pilis longis 

 palHdis sparse vestitus ; pedibns flavescenti-albidis phis 

 minus brunneo-infuscatis ; abdomine fusco-atro ; oculis 

 griseo-brunneis magnis posterius ad marginem posticum 

 capitis conjunctis {$) vel fere conjunctis ( ? ) ; vertice 

 leviter convexo-prominulo in medio anguste longitudina- 

 liter sulcato ; fronte leviter convexo prominulo ; pronoto 

 ( (J ) anterius obsoletissime carinato ; tarsis anticis in utroque 

 sexu dimeris; tibiis tarsisque posticis pilis pallidis et fuscis 

 instructis. 



Long. 5 — 5\ mm. 



Hah. — Manaos, August, 1875. 



Two specimens, not in the best condition for describing. 

 Hence I have not been able to describe minutely the 

 coloration of the underside or of the legs. 



Martarega, gen. nov. 



Corpus oblongum, cylindricum. Caput magnum, supra 

 subquadratnm, margine antico pronoto latins ; vertice 

 anguste triangulari, convexo-prominulo ; fronte lineari 

 convexiusculo. Oculi maximi supra visi suboblongi, 

 per dimidium posterius longitudinis conjuncti, margine 

 postico rotundato-producto et pronoto incumbente ; ad 

 latera visi semilunares, margine postico bisinuato ; infra 

 visi triangulares. AnteuntB articulo 1° brevissimo 

 latiore quam longior ; 2° crasso, longo, cylindrico ; 3° 

 cylindrico, 2° longiore sed multo graciliore, seriebus 

 duabus pilis longis instructo, pilis seriei posterioris 

 capitulatis; 4° dimidio 3' noquilongo, graciliore, cylin- 

 drico. Kostrum quadriarticiilatum, articulis 1° 2''que 

 brevibus, transversis, 3° 1° 2°que simiJ sumptis asqui- 



