Clje faabian Entomologist. VOL. XL LONDON, ONT., SLPTEMBER, 1879. No. 9 PARASITES OF THE COTTON WORM. BY PROF. C. V. RILEY, WASHINGTON, U. S. Among the parasites so far found to attack and destroy Aletia argillacea Hubn., aside from two not reared to the perfect state, are the following : Obtained from the egg, Trichogramma pretiosa n. sp. ; from the larva, Tachina aletia n. sp., and Sarcophaga sarracctiice Riley ; from the pupa, Pimpla conquisitor (Say), Cryptus nuncius Say, Chalcis ovata Say, and Cirrospilus esurus, n. sp. I append descriptions of the new species, in order that they may be properly referred to by Prof. J. H. Comstock, who is now finishing the report on the Cotton Worm begun by me while connected with the Department of Agriculture. 1. Trichogramma pretiosa, n. sp. — Length about 0.3 mm. Yel-low, the eyes red, the wings hyaline. Head wider than the thorax ; antennae 5-jointed, joints 3 and 4 in the % forming an ovate mass and together shorter than joint 2 ; joint 5 large, thickened and very obliquely truncate ; in the £ joints 3, 4 and 5 form a more or less distinct, elongate club, beset with long bristles. Hairs of the wings arranged in about fifteen lines. Abdomen not so wide as the thorax, but as long as the head and thorax together; in the £ the sides subparallel, and the apical joint < suddenly narrowed to a point. Described from numerous specimens reared from eggs of Aletia argillacea. Differs from Trichogramma minuta Riley (Third Rep. Ins. Mo., p. 158, fig. 72, °. ) in its smaller size and uniform pale yellow color, and also in the luim of the third and fourth joints of the antennae. As defined and figured by Westwood, the antennae of Trichogramma are 6-jointed. Walker, in his "Notes on the Chalcidia?," pt. vi., p. 105, employing
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