Page 219. Limnophila inornata 0. S. $ . This species was quite com- 

 mon near Tarrytown, N. Y., in June, 1871. Two females which I have 

 before me have the stigma somewhat tinged with brown ; the brown at 

 the tip of the femora is more abruptly marked. In the above-quoted 

 description, p. 219, line 4 from bottom, the word femora must be added 

 before the word yellowish. On the following page, line 5 from top, instead 

 of about, read somewhat less than. The fore tarsi of the females are shorter 

 than those of the male. The length of the second posterior cell is vari- 

 able. 



Page 260. Polymera. This South American genus, never seen by me 

 before the publication of my volume, was doubtfully mentioned among 

 the Amalopina. Mr. Loew had opportunities of examining good specimens 

 recently, and published the result in a paper entitled Uber die systema- 

 tische Stellung d. Gatt. Polymera Wied. (Zeitschr. f. d. gesammten Natur- 

 wiss. NeueFolge, 1871, Bd. Ill, Tab. V, f. 1,2). It appears now that the 

 antennae of Polymera are not 28-jointed, as was stated by former authors, 

 but 16-jointed, and that there cannot exist the slightest doubt about its 

 location among the Limnophilina. It has peculiarities, however, which 

 distinguish it from the ordinary Limnophilina of Europe and North Ame- 

 rica: a remarkably elongated third antennal joint, a structure of the fol- 

 lowing joints, in the male, which makes them appear double (hence the 

 error of former authors), an open discal cell, and both branches of the 

 fourth longitudinal vein forked (contrary to the rule stated on page 201, 

 No. 2) ; the wingveins have a rather conspicuous pubescence. Mr. Loew 

 ends his article with a statement of the principal characters of Polymera, 

 as recognized by him, which I reproduce here, with a slight modifica- 

 tion : 



Polymera. The number of antennal joints is normal, 16 ; the first joint of the 

 flagellum is remarkably elongated, cylindrical, beset with long, erect hairs ; each 

 of the following joints, in the male, shows two consecutive knots, or swellings, 

 every one of which is provided with a distinct verticil of hairs ; in the female, 

 these joints are simply cylindrical, and beset with hairs like the first joint of the 

 flagellum. Wingveins beset with a long pubescence ; subcostal crossvein only a 

 short distance from the tip of the auxiliary vein ; marginal crossvein distinct, 

 inserted on, or a little beyond the middle of the very long submarginal cell ; basal 

 cells comparatively rather short ; discal cell open, coalescent with the third poste- 

 rior cell ; five posterior cells; the second with a petiole of a very great length ; 

 feet long and slender ; tibiae with very small but distinct spurs ; ungues and em- 

 podia very small. 



