16 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.65. 



Franklin Shull of Ann Arbor, Michigan who states that they were 

 suspected of parasitizing the " common white-fly." Three of the 

 latter specimens mounted on card points, the other one in balsam. 



Since the above description was drawn up additional specimens 

 of this sjDecies have been received as follows: a large series from 

 Wooster, Ohio, reared by J. S. Houser from pupae of T i-^kilewrodes 

 vaporariorum (Westwood) in a gi^eenhouse, February 5, 1923; a large 

 number of specimens reared March 8, 1923, from pupae of the same 

 Aleurodid taken in a greenhouse on the Department of Agriculture 

 grounds at Washington, D. C, by W. H. White. 



The host insects from which the type specimens came were not 

 definitely determined but in all probability they were the same 

 species which served as host for the Ohio and District of Columbia 

 specimens. 



The parasitized Aleurodid pupae turn black in color and are easily 

 distinguished from healthy pupae which are greenish. The parasite 

 was reported as extremely abundant in both the Wooster, Ohio, 

 and Washington, D. C, infestations. 



Family PTEROMALIDAE. 



RHOPALICUS PULCHRIPENNIS (Crawford). 



Spintherus pitlchtipeitn'Ls Crawford, Proc. U. S. Nat. Mus., vol. 43, 1912, 



p. 168. 

 Rhopalicus americanus Girault, Ann. Ent. Soc. Amer., vol. 9, 1916, p. 296. 



Types of Spintherus pulchripennis Crawford and of Rhopalicus 

 americanus Girault are in the U. S. National Museum and have been 

 compared. The two are identical. In the opinion of the writer the 

 species is more properly placed in Rhopalieus Foerster than in 

 Spintherus Thomson. 



EUPTEROMALUS COGNATUS, new species. 



Very similar to vbidescens (Walsh) but differs from that species 

 by having the joints of the funicle slightly shorter, the occiput a 

 little more concave, the antennal groove somewhat deeper, the occi- 

 pital carina very weakly developed, and the punctation of the head 

 and thorax a little stronger. 



Female. — ^Length, 2 mm. Head and thorax with the usual reticu- 

 late-punctate sculpture common to the group but the punctures 

 slightly deeper than in most of the other species; abdomen shining, 

 with the tergites, except the first, very obscurely reticulated ; scutel- 

 lum sculptured alike all over or with only a very slight indication of 

 a differently sculptured area at apex; propodeum punctate with a 

 weak median carina. 



Head viewed from above broader than the thorax ; occiput rather 

 deeply concave medially and very weakly margined; posterior 



