Geographical Extension in a New Ecological Association of Panstrongylus Humeralis (Hemiptera: Reduviidae), Natural Host of Trypanosoma Cruzi in Panama1

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Abstract
Panstrongylus humeralis (Usinger, 1939) is a triatomine species known to occur only in the type-locality of Barro Colorado Island (BCI), Gatun Lake, Panama Canal Zone, from where it has been occasionally collected since early 1933 (Usinger, 1939, Univ. Calif. Publ. Ent. 7: 38–40). Although much attention has been given to the triatomines found elsewhere in Panama (Pipkin, 1968, J. Med. Ent. 5: 107–24; Sousa & Johnson, 1973, Amer. J. Trop. Med. Hyg. 22: 18–23), P. humeralis does not appear to be a common species. Fairchild (1943, Amer. J. Trop. Med. 23: 569–91), listing the bloodsucking insects of Panama, refers to a series of 3 males and 1 female P. humeralis taken at light during January 1941 on BCI by K. W. Cooper. Usinger (1944, Pub. Hlth Bull. No. 288, U. S. Pub. Hlth Serv., Washington) offered a brief description of the adult morphology of the species and referred to specimens collected on BCI by James Zetek during April 1941, as well as those of Cooper collected earlier that year. P. humeralis can be easily distinguished from P. lignarius or P. herreri by external morphological characteristics.

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