1930 ] 
Notes on American N emestrinidae 
291 
mondville, one female and one male (F. M. Hull Coll.). 
Mississippi : Agricultural College near Starkville, several 
females and males (E. K. Dickey, W. E. Anderson, and F. 
M. Hull Coll.) . Kansas : Bourbon Co., 800 ft., one female (R. 
H. Beamer Coll.) ; Sumner Co., 1189 ft., one female (R. H. 
Beamer Coll.) ; Lawrence, one female (C. H. Curran Coll.) ; 
Douglas Co., one male (W. J. Brown Coll.). Mexico: Presi- 
dio River, Villa Union, Sinaloa, one female (A. Kusche Coll. 
U. S. Nat. Mus.3 ; Venodio [? Fenochio, Sinaloa], one female 
(A. Kusche Coll. — U. S. Nat. Mus.) ; State of Colima, one 
female (L. Conradt Coll. — U. S. Nat. Mus.) ; Mexico City, 
one female (Juan Muller Coll. — U. S. Nat. Mus.) ; Mata- 
moros, Morelos, one female (W. L. Tower Coll.) ; Altamira 
Farms, four males (M. E. Hoag Coll. — Ac. N. Sci. Phila.). 
Yucatan: Chichen Itza, three females, and six males, taken 
in the dry forest, from June 6 to 10, 1929; the species is 
evidently common in this locality, although difficult to find 
and to collect; it is on the wing during the warmest and 
sunniest hours of the day, when it hovers in the bushes, 
some 2 to 10 ft. above the ground, poising on a spot for 
many minutes, while producing a characteristic, high- 
pitched noise ; after a while it may rest on the tip of a dry 
branch. 
There are also reliable, published records of N. volaticus 
from Kingsville, Texas; West Point, Mississippi; Chilpan- 
cingo, Guerrero; Mazatlan, Sinaloa; Vera Cruz, Mexico; 
and San Geronimo, Guatemala. 
Neorhynchocephalus sackeni (Williston) 
Rhynchocephalus sackeni Williston, 1880, Trans. Conn. Ac. 
Sci., IV, 4, p. 243, fig. ( $ ; Olympia, Washington 
State) ; 1883, Canad. Entom., XV, pp. 70 and 71 ( $ ) ; 
1894, Ent. News, V, p. 47. Snow, 1903, Kansas Univ. 
Sci. Bull., II, 5, p. 214. Hine, 1904, Canad. Entom., 
XXXVI, pp. 86 and 90. Aldrich, 1905, “Cat. North 
Amer. Dipt.,” p. 219. Cockerell, 1908, Trans. Amer. Ent. 
Soc., XXXIV, p. 249, PL XVI, figs. 1 and 3. Kertesz, 
1909, “Cat. Dipt.,” IV, p. 30. Cockerell, 1910, Bull. Amer. 
Mus. Nat. Hist., XXVIII, p. 286. Schaeffer, 1912, Jl. 
