ERRATA ET CORRIGENDA. 
Page i, line 5, after Heidemann insert Hopkins. 
5, line 12, for only read second. 
17, line 13 from bottom, for yathigerum read cyathigerum 
19, line 14 from bottom, for madidum (Hagen) read assimilaium. 
(Uhler). 
50, line 2 from bottom, for + read 
105, line 12, for Oregon read Washington. 
105, line 13, omit feeding. 
105, line 13, for flowers read leaves. 
128, line 4, for disposal read dispersal. 
150, line 9 from bottom, for Cypophaga read Cyphopyga. 
157, line 3, for parvula D. T. read nigritula Friese. 
157, after line 10 insert 1902: Friese, Zeits. f. Hym. Dipt., p. 109 
(O. ni gritula n. n. for parvula). 
