Page 49, line 14 from bottom, transfer Gen. XXII. Psiloconopa, as 

 Gen. XX, after Chionea. 



Page 135, line 2 from bottom, strike out the passage beginning with 

 "I believe now" and ending with "typical Eriopterina. " 



Page 137, line 11 from top, instead of Psiloconopa, read Goniomyia. 



" 173, line 13 from bottom, strike out the whole paragraph 

 beginning with the words : "A genus closely allied, etc.," as well 

 as its continuation on the next page, down to the "Description 

 of the species." 



Page 176. Gen. XXII. Psiloconopa should be placed between Chionea 

 and Symplecta as Gen. XX. with the following notice : Established 

 by Zetterstedt in 1840 {Fauna Lapponica, p. 847), and later in 

 Dipt. Scand. X, p. 4007, upon a single species, found in Sweden. 

 This genus, as far as I have been able to study it upon a dry 

 specimen, is related to Trimicra, and its venation is exactly the 

 same, the subcostal crossvein being quite remote from the tip of 

 the auxiliary vein, etc. However, it does not have the last three 

 antennal joints abruptly smaller, and its general appearance is 

 altogether different. 



Page 177, line 10 from bottom, strike out the passage beginning with 

 the words : " The majority" down to the bottom of the page, and 

 read as follows instead : Some European species differ from the 

 American ones in the following characters : in their coloring the 

 black prevails over the yellow ; only a few traces of the latter 

 color are left; the auxiliary vein seems to extend much farther 

 beyond the origin of the prsefurea than is the case in the Ame- 

 rican species ; the structure of the male forceps seems also to show 

 some differences, which, however, I have not been able to ascer- 

 tain, not having had fresh specimens for comparison. Such 

 species are the Erioptera lateralis Macq., Hist. Nat. Dipt. II, p. 

 653 (Syn. Limnobia Jlavolimbata Hal., in Walker's Ins. Brit. Dipt. 

 Ill, p. 304) ; the Goniomyia scutellata Egger and G. cincta Egger, 

 in Schiner's Fauna Austriaca, Diptera. One of the latter may be 

 synonymous with the former, and Dr. Schiner was perfectly 

 right in referring them to the genus Goniomyia. All these species 

 are not unlike the American species of Gnophomyia in their 

 general appearance ; they differ, nevertheless, in the absence of 

 the marginal crossvein, in the shortness of the first submarginal 

 cell, in the diverging direction of the branches of the fork which 

 form it, and in the presence of yellow in the coloring. It is not 

 impossible, however, that forms of transition may be discovered 

 between these two genera, as well as between them and Empeda. 



(XI) 



