The Nabidae (Hemiptera) of the Neotropical Region are cataloged. A total of 12 genera and 83 species are listed together with their synonyms. References are given to the original descriptions and the subsequent taxonomic position, the location of types, and the geographic distribution. A comprehensive bibliography is provided.

The Heteroptera (Hemiptera) of Argentina are catalogued. A total of 686 genera and 2030 species are listed together with their synonyms. References are given to the original descriptions and the subsequent taxonomic position, and the geographic distribution is included.

Of the 17 genera in Triatominae, only one, Linshcosteus, occurs exclusively outside the New World (India). Its relationship to the rest of the subfamily has been questioned, a question made urgent by the fact that many triatomines are vectors of the protozoan which causes Chagas' disease. Using a simple measure of similarity, we show that Linshcosteus is less similar to the other triatomine genera than each of them is to the others.

The genus Peirates Serville is revised. A total of 32 species are recognized. Its species are assigned to the P. quadrinotatus, P. singularis and P. lepturoides species groups. The P. quadrinotatus species group includes P. argenteopilosus Schouteden and P. quadrinotatus Fabricius; the P. singularis species group comprises its sole species P. singularis StÅl, and the P. lepturoides species group is formed by P. atromaculatus (StÅl) (= P. buruanus Miller, P. consobrinus Miller, P. excelsus Miller, P. immaculatus Miller, P. sordidus Miller, syn. n.), P. monodi Villiers, P. mundulus StÅl, P. nanus Miller, P. niger Signoret, P. nitidicollis Reuter, P. ochripennis Jeannel, P. perinetensis Villiers, P. strepitans Rambur, P. stridulus (Fabricius), P. tellini Schouteden, P. turpis Walker, P. aurigans Distant, P balteatus Germar, P. castaneipennis Reuter, P. cinctiventris Horváth, P. collarti Schouteden, P. confusus Schouteden (= P. amieti Villiers, syn. n.), P. crudelis sp. n., P. dimidiatus Walker (= P. areatus Miller, syn. n.), P. diola Lindberg, P. hybridus (Scopoli), P. lepturoides (Wolff) (= P. mimulus Miller, P. musculus Miller, P. sparsus Miller, syn. n.), P. macilentus Miller, P. marginiventris Distant, P. maurus StÅl, P. monodi Villiers, P. mundulus StÅl, P. nanus Miller, P. nigerrimus sp. n., P. nitidicollis Reuter, P. ochripennis Jeannel, P. perinetensis Villiers, P strepitans Rambur, P. stridulus (Fabricius), P. tellini Schouteden, and P. turpis Walker. Besides, P. sepulchralis Distant and P. sin Linnavuori are transferred to Brachysandalus StÅl, and P. barbarus Miller, P. bicolor Distant, P bicoloripes Breddin, P. flavipes (Walker), P. montivagus Distant, P. pallens Miller, and P. semifasciatus to Lestomerus Amyot & Serville, and P. umbrosus StÅl to Microsandalus StÅl. P. concinnus Walker cannot be assigned to any existing genus. P. cyaneonitens Breddin was not studied, and P. parvulus (Signoret), P. punctum (Fabricius), P. vittatus Reuter are considered as nomina dubia. Species are described, illustrated, and their geographical distribution is mapped. A key for separating all the species is given. A phylogenetic analysis of the species is presented. In the cladogram, the P. quadrinotatus, P. singularis and P. lepturoides species groups are monophyletic and a sister group relationship exists between the P. quadrinotatus group and the combined P. singularis + P. lepturoides groups. The geographical distribution of the species shows an African-Indopacific generalized track with an Indian Ocean baseline. The genus Peirates is hypothesized to have a tropical Gondwanan origin, with subsequent spread into the Palearctic region.

In Argentina, five genera and 14 species are recorded in the subfamilies Prostemmatinae and Nabinae: Hoplistoscelis sordidus Reuter, Lasiomerus constrictus Champion, Metatropiphorus alvarengai Reuter, Nabis argentinus Meyer-Dür, Nabis (Tropiconabis) capsiformis Germar, Nabis faminei Stål, Nabis paranensis Harris, Nabis punctipennis Blanchard, Nabis roripes Stål, Nabis setricus Harris, Nabis tandilensis Berg, Pagasa (Pagasa) costalis Reuter, Pagasa (Lampropagasa) fuscipennis Reuter and Pagasa (Pagasa) signatipennis Reuter.

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A revision was made of Repipta Stål, mostly a Neotropical genus with some species in the Neotropics and the Nearctic. Thirteen known species are redescribed: R. annulipes Barber, R. antica Stål, R. coccinea (Herrich-Schaeffer), R. flavicans (Amyot & Serville), R. fuscospinosa Stål, R. fuscipes Stål, R. lepidula Stål, R. mucosa Champion, R. nigronotata Stål, R. obscuripes Stål, R. sexdens (Fabricius), R. spinosa (Fabricius), and R. taurus (Fabricius). Twelve new species are described and illustrated, including data on male and female genitalia, new distributional records, and key to the species.

The subfamily Bactrodinae is revised. Its sole genus includes five species: Bactrodes femoratus (Fabricius), B. biannulatus Stål, B. spinulosus Stål, B. multiannulatus Berg, and B. misionensis, new species. A cladistic analysis; descriptions of the subfamily, the genus, and its species; and a key are included, as well as a map with geographical distributions.