In the original description of this insect, * Dr.Riley says that on account of its uniform pale yellow colour it is easily distinguished from Trichogramma minutum, Riley, which is black. Unfortunately, this does not hold.† Out of the hundreds of specimens of pretiosa reared during the enire season of 1904, at Paris, Texas, from the eggs of Heliothis obsoleta, Fabricius, there appeared from a lot of host eggs on Sept. 20th a number of dark individuals, which could easily have been mistaken for a distinct species.