142 Bulletin Wisconsin National History Society. [\o\. 9, No. 4. 



The species has been redescribeel as new a number of times. 

 First, Riley (1879) redescribed it as the new species pretiosa, 

 thus : 



1. Trichogramma pretiosa, n. sp. — Length about 0.3 

 mm. Yellow, 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 trun- 

 cate ; in the 6 joints 3, 4 and 5 form a more or less dis- 

 tinct, 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 5 the sides subparallel, and the apical 

 joint suddenly narrowed to a point. Described from 

 numerous specimens reared from the eggs of Aletia argil- 

 lacea. 



Differs from Trichogram ma minuta Riley (Third Rep. 

 Ins. Mo., p. 158, fig. 72, $ ) in its smaller size and uniform 

 pale yellow color, and also in the form of the third and 

 fourth joints of the antenna?. As defined and figured by 

 Westwood, the antennas of Trichogramma are 6-jointed. 

 Walker, in his "Notes on the Chalcididce," pt. vi., p. 105, 

 employing Forster's character, says the antenna? are 

 8-jointed; but an examination of the figure of the type 

 Trichogramma evanescens, 1. c, p. 114) shows that one 

 of the joints counted is the "annulus" above the scape, 

 which I do not consider to be a true joint, and that what 

 I have indicated as the apical joint, in agreement with 

 Westwood, is represented in that figure as three coalesced 

 joints. I have proposed the generic name of Pentarthrum 

 for minuta in MS. now in Mr. Scudder's hands, but until 

 the allied genera are better characterized than at present, 

 it is best to use the old genus Trichogramma." [pp. 161- 

 162.1 



This description was republished in full by Comstock (1879) 

 with a single error (in the third line of the first paragraph joint 3 

 is printed instead of joint 5 as in the original) and also in part 

 by Riley (1885) who quoted the first paragraph of the original 

 with the exception of its last sentence and also the first sentence 



