296 
Psyche 
[September 
Merida). Osten Sacken, 1877, Bull. U. S. Geol. Geogr. 
Surv. Terr., Ill, p. 224; 1878, Smithson. Miscell. Coll., 
No. 270, p. 85. Williston, 1883, Canad. Entom., XV, p. 
70. Aldrich, 1905, “Cat. North Amer. Dipt./’ p. 218. 
Cockerell, 1908, Trans. Amer. Ent. Soc., XXXIV, pp. 
251 and 252, PI. XVI, fig. 2; 1910, Bull. Amer. Mus. 
Nat. Hist., XXVIII, p. 286. 
Hermoneura brevirostris Kertesz, 1909, “Cat. Dipt.,” IV, 
p. 25. 
Hyrmophlaeba brevirostris Rondani, 1863, Arch, per la 
Zoologia, Modena, III, 1, p. 51. Lichtwardt, 1910, 
Deutsch. Ent. Zeitschr., pp. 580 and 591. J. Bequaert, 
1920, Jl. New York Ent. Soc., XXVII, (1919), p. 306. 
This species, originally described from the State of Yu- 
catan, has been reported from Mexico by Lichtwardt. I 
have seen two specimens from Guatemala : El Rancho, one 
female (J. S. Hine Coll.), and Gualan (in the eastern part), 
one male (C. C. Dean Coll. — U. S. Nat. Mus.). 
Since no adequate description of this insect has ever been 
given, the following notes may help to recognize it. 
Female . — Integument of the body uniformly black, en- 
tirely covered with ashy gray pruinosity. Antennae dark 
brown, the basal segments paler, the arista black. Probos- 
cis and legs pale reddish-yellow, the tibiae dirty white. 
Body moderately hairy all over. Ocellar triangle and upper 
part of face with black pilosity ; lower part of face and outer 
orbits with white hairs; two basal segments of antennae 
with very long and dense, spreading, black hairs, forming 
fringes above and below. Thorax densely covered with 
rather long, pure white hairs. Abdomen : first tergite with 
similar long white pilosity ; the succeeding tergites evidently 
rubbed off in the specimen seen, since they bear only sparse, 
black and gray hairs, forming small tufts on the sides; 
sternites covered with silvery white pile. Legs with white 
hairs, mixed with a few black hairs on tibise and tarsi. 
Head large, hemispherical in profile, about as broad as high, 
slightly wider than the thorax. Frons extremely narrow, 
less than one-quarter the width of an eye at its broadest 
point (just above the antennae) ; inner orbits diverging 
