130 Journal New York Entomological Society, [^oi. xxi. 



The following figures will give an idea of the degree of constancy 

 of the characters : 



Five males of salina gave the following numbers for column i — 

 2.39, 2.45, 2.44, 2,42, 2.50. Average, 2.44; range, .11. 



Eight males of tentaculata gave 3.00, 2.95, 2.76, 2.77, 2.72, 2.70, 

 2.74, 2.89. Average 2.82 ; range, .30. 



Four males of uliginosa gave 2.77, 2.72, 2.89, 2.83. Average, 2.80; 

 range, .17. 



Four females of nasoni gave the following for column 2 — 2.40, 

 2.58, 2.50, 2.54. Average, 2.51; range, .18. 



Three females of tentaculata gave 2.33, 2.34, 2.33. Average, 2.33; 

 range, .01. 



Four females of salina gave 2.00, 2. 11, 2.06, 2.41. The last showed 

 the character of the male in the front, and I re-examined it carefully. 

 It was the only case of the kind that occurred, and as it appeared 

 abnormal I excluded it from the average, which would then be 2.06, 

 with a range of .11. 



The following species mentioned in my Catalogue are not included 

 herein ; for the reasons given : 



consangiiinea. The dark tibiae are not decisive, as made out by 

 Stein, and there is no evidence that the species as now accepted occurs 

 in North America. 



flavicincta. Not seen by Stein, and probably not North American. 



hispida. Unrecognizable, and type not found by Stein in the 

 British Museum. 



nigromaculata. A synonym of palposa, but the fact was accident- 

 ally omitted in the Catalogue (Stein, Zeitsch. f. Hym. u. Dipt., 1901, 

 203, 209). 



rufitihialis. Probably recognizable, but not known from the main- 

 land of North America, and not seen by me. 



serotina. I cannot make out any tangible characters. 



The following species is added (mentioned in the appendix to the 

 Catalogue, in the 1904 literature) : 



polita Coquillett, Invertebrata Pacifica, I, 34. — Ormsby Co., Ne- 

 vada. 



The bibliography since 1904 is mostly unimportant, consisting of 

 notices of the occurrence of some of the widespread species in new 



