Lacertinella australis is distributed in 11 provinces of Argentina and has been mentioned as a species of phytosanitary concern because of its potential for the transmission of pathogens. Considering its wide range of distribution, its poten-tial phytosanitary importance and the invasive nature of its principal host plant Cor-taderia spp., life cycle aspects were evaluated through a life table under controlled conditions in the laboratory and a second table based on samples of natural popu-lations. Population parameters R0, λ, rc, Vx, Tc and the average development time by stages were estimated. Behavioral and bionomic aspects of L. australis were re-corded and compared with the only two species of the tribe Saccharosydnini whose biology is known: Saccharosydne procerus and Saccharosydne saccharivora.

Lacertinella australis ha sido capturada en 11 provincias de la Argentina y fue mencionada como una especie de interés fitosanitario por su potencial para vehiculizar fitopatógenos. Atendiendo al amplio rango de distribución, su potencial importancia fitosanitaria y el carácter invasivo de su principal planta hospedera, Cortaderia spp., se evaluaron aspectos del ciclo de vida a través de una tabla de vida vertical bajo condiciones controladas en el laboratorio y se confeccionó una segunda tabla de vida sobre la base de un muestreo de una población natural. Se estimaron los atributos poblacionales: tasa reproductiva básica o tasa de reemplazo (R0), tasa finita de crecimiento poblacional (λ), capacidad de incremento poblacional (r c), valor reproductivo (Vx), tiempo generacional de la cohorte (Tc) y el promedio del tiempo de desarrollo por estadios. Se mencionan y comparan aspectos comportamentales y de la bionomía de L. australis compartidos con las dos especies de la tribu cuya biología se conoce: Saccharosydne procerus y Saccharosydne saccharivora.

Saccharosydne is the most diverse genus of the tribe Saccharosydnini. Male, female and nymphal Saccharosydne have been captured in recent collections from garlic (Allium sativum), rye (Secale cereale) and pampas grass (Cortaderia spp.) in Argentina. In this contribution, we describe and illustrate a new species S. subandina sp. nov., adding information on the geographical distribution and host plants. Saccharosydne subandina can be distinguished from its congeners by the following combination of features: uniformly light green-yellowish color with a distinctive rounded black macula on both genae; vertex 1.5x longer than wide, and projecting beyond eyes almost one half of its length; parameres divergent with internal and external angles acute; and dorsolateral angles of pygofer produced caudad. A key for species identification based on male genitalia and external morphology, is provided.

Se registra por primera vez el género Saccharosydne Kirkaldy en Argentina. Éste es económicamente el más importante representante de la tribu Saccharosydnini. Se agrega la distribución geográfica de todas las especies y algunos datos morfológicos y biológicos relevantes. Este nuevo registro representa el límite más austral de la tribu en América.

A new genus, Saccharosydne Kirkaldy, is reported in Argentina. This is the most economically important representative of the tribe Saccharosydnini. The geographical distribution of all species and some morphological and biological relevant data of this genus are added. This new record represents the southernmost limit of the tribe in the Americas.

Registra-se por primeira vez o gênero Saccharosydne Kirkaldy na Argentina. Este é econômicamente o mais importante representante da tribu Saccharosydnini. Soma-se à distribuição geográfica de todas as espécies e alguns dados morfológicos e biológicos relevantes. Este novo registro representa o límite mais austral da tribu na América.