Page 115. Toxorrhlna muliebris 0. S. % . I found three males and 

 one female near Tarrytown, N. Y., in July, 1871. They all have the dis- 

 cal cell open, which, therefore, seems to he the rule in this species. The 

 stripes of the thorax are dark hrown ; the position of the great crossvein 

 is variable, sometimes at the very basis of the discal cell, sometimes 

 before it. 



Page 138, at the bottom. Sigmatomera. I described this new genus, 

 from Mexico, without adding the description of the typical species, which, 

 as I anticipated, would be soon published in a new fascicle of Mr. Bellardi's 

 Saggio, etc. This publication having been, in the mean time, indefinitely 

 postponed, it becomes necessary to supply the above mentioned omission. 



Sigmatomera jlavipcnnis n. sp. — Yellow, antennae long, black, except the 

 first joint, which is yollow ; front feet and middle femora yellow (the 

 remaining feet as well as the middle tibiae and tarsi, are wanting). 

 Wings tinged with yellowish ; central crossveins and fifth vein slightly 

 bordered with brown. Long. corp. 0.56 — 0.6; long. al. 0.64. 

 Hub. Mexico (Sumichrast). 



Page 173. Psiloconopa. I had occasion to examine specimens of P. 

 Meigenii Zett., since the publication of Vol. IV, and have become aware 

 that my opinion about its location was erroneous. This genus is related 

 to Trimicra, and its venation is exactly like the latter genus, the subcostal 

 crossvein being quite remote from the tip of the auxiliary vein. The two 

 other European species, mentioned on pages 173 and 174 as Psiloconopoz, 

 do not belong to this genus at all, and are much better placed in the genus 

 Goniomyia. The above correction will necessitate changes in all the pas- 

 sages, where the genus Psiloconopa is mentioned. Such passages are the 

 following: — 



Page 21, line 4 from bottom, instead of Psiloconopa ?, read Goniomyia ?. 



" 36, " 7 from bottom, strike out the whole passage beginning 



with is represented. 

 Page 36, line 3 from bottom, add Psiloconopa. 



" 47, modify the analytical table thus : — 

 „„ ( The distance, etc. 30 



I The distance, etc. Gen. XXII. Gnophomyia. 



{Seventh longitudinal vein straight; Tab. II, f. 1. 31 



Seventh longitudinal vein conspicuously bisinuated; Tab. I, fig. 

 20. Gen. XXI. Symplecta. 



(Three terminal joints of the antennae abruptly smaller. 

 j Gen. XVIII. Trimicra. 



I Three terminal joints, etc., not abruptly smaller. 

 L Gen. XX. Psiloconopa. 



(IX) 



