26.8 Osten Sacken: Malformation of Liogma glabrata. 



glabrata Meig., it can be called glabrata Schiri, (nee Meig.), as gla- 

 brata Meig. in that case woulcl probably belong to some other.genus 

 than Liogma. 



I propösed tbe genus Liogma in Monogr. IV, p. 298 (1869) for 

 the European glabrata and the North-American nodieomis. The wing 

 of the latter is figured I.e. pl. I, f. 7: it differs from glabrata in 

 having the proximal end of the submarginal cell in direct eontact 

 with the discal cell, so that the anterior crossvein is suppressed, a 

 formation which has no generic importance whatever. 



Liogma has four posterior cells, the true Cylindrotomae 

 (distinetissima and americana) have tive. Schiner has a non- 

 committal way of expressing himself about this difference, which 

 requires verification: „der von dem obersten Zweige der vierten 

 Längsader in die erste Hinterrandzelle hinein ausstrahlende Zweig, 

 welcher bei distinetissima in der Regel vorhanden ist, fehlt bei dieser 

 Art, glabrata, in der Regel" (Schin. II, p. 563, linc 8 from bottom; 

 a similar statement on the same page, linc 6 from top). 



That aberrant speeimens of such a description really oeeur in 

 both genera remains to be proved. 



Erratuin. 

 In my article: „On the atavic index-characters etc.", Berl. Ent. 

 Zeitschr. 1894, p. 73, line 10 from top, strike out: „two-winged 

 insect" and put „Dipteron" instead. 



