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The males of the sandfly Lutzomyia longipalpis occur in two forms, one which bears a single pair of pale spots on tergite 4 and another in which an additional pair of spots characterizes tergite 3. In crosses between laboratory reared stocks of the two forms originating from allopatric and sympatric sites in Brazil nearly all males of one form fail to inseminate females of the other. In addition, insemination failure between some allopatric populaytions of Lu. longipalpis with similar tergal spot patterns is recorded, indicating the existence of additional forms in an apparent species complex. The possibility that Lu. longipalpis sensu latu represents more than a single taxon is discussed and the relevance of these findings to future epidemiological studies on kala-azar is considered. Os machos de Lu. longipalpis ocorrem em duas formas distintas: uma com um simples par de manchas claras no 4º tergito e a outra com um par adicional de manchas caracterizadas no 3º tergito. Cruzamento entre linhagens obtidas no laboratório das duas formas, originárias de áreas alopátricas e simpátricas no Brasil, demonstrou que quase todos os machos falharam em inseminar fêmeas heterólogas. Observou-se também falhas na inseminação entre populações alopátricas de Lu. longipalpis com as mesmas características de manchas indicando a existência de duas ou masi formas num aparente complexo de espécies. A possibilidade de Lu. longipalpis sensu latu representar mais que um simples taxon é discutida e a relevância destes encontros no futuros estudos epidemiológicos do kala-azar é considerada

memórias do instituto oswaldo cruz

Reproductive isolation between different forms of Lutzomyia longipalpis (Lutz &amp; Neiva), (Diptera: Psychodidae), the vector of Leishmania donovani chagasi Cunha &amp; Chagas and its significance to kala-azar distribution in South America