ERRATA. 



Page 12, lines 16 and 17, for one hundred read three hundred and for 

 one thoiisand read .sice hundred. 



Page 17, line 2, dele first letter in the line. 



Page 168, line 12, page 177, lines 13 and 14, and page 271, line 10, for 

 Lemna trisulca read Spirodela polyrhiza. 



Page 209, line 2 of foot-note, after but insert represents. 



Page 256, line 7, and page 266, line 19: snowi n. s. has been shown to 

 be hierogbjphica, c^. 



Page 257, insert as line 8 as follows: -ken to the office produced young 

 in ten days. The 



Page 272, line 13, for P. biguttatus read Pompilus higuttatus. 



Page 278, Plate V., 16, after view insert as follows: a, mentum; b, 

 labial rudiment; c, maxillary palpi; d, maxilla; e, labrum; /, antenna; y, 

 eye; h, mandible. 



Page 286, line 11, drop initial the one line. 



Page 386, line 1, for Comstocki read Comstock. 



Page 399, line 17, for specimens read specimen. 



Page 411, line 10, for Michaelson read Michaelsen. 



Page 441, line 3 from bottom, for 6G read 6S. 



Page 445, line 10 from bottom, for 57 read 58. 



Page 466, line 1 from bottom, for Cypria read Cypris. 



