Heterothrips marginatus Hood, 1954

This species is remarkable in having a well-developed craspedum on abdominal tergites II–VIII. The posterior margins of the craspedum have a row of small microtrichia (Fig. 45). The fore wing are uniformly dark (Fig. 41), and abdominal sternites lack of discal setae. Males have small transverse pore plates on abdominal sternites III– VIII. This species is also recorded from La Pampa, Argentina by De Santis (1959).

Material examined. Holotype female, Brazil, Pará, Belém, 24.vii.1951, on Andropogon sp. (J.D. Hood) (USNM). Paratypes: 2 females, 1 male, collected with holotype (USNM).