386 The American Naturalist. [May, 
“Tt measures 0.08 in length, and is black, with the thorax 
smooth and slightly shining, the thighs pale and whitish, and 
the wings pellucid and glassy, with an iridescent violet and 
red reflection.” (Fitch.) 
This very brief and incomplete description, without access 
to the types, would hardly enable recognition of this form. To 
it may be added the following : 
“Male. Brownish-black ; bases of the halteres, coxee, femora 
and tibiæ, yellow. Antenne as long asthe body. Each apical 
joint of the hypopygium bears a cluster of short spines on the 
apical third of the inner side. Wings grayish hyaline, strongly 
iridescent, veins brown, fourth vein more slender than the 
others, forking at a point beyond the tip of the first vein, equal- 
ing the greatest width of the marginal cell, the anterior fork as 
long as the preceding section of that vein ; last section of the 
first vein about as long as the preceding section; costa gently 
convex on the basal half. 
“Female. Same as the male, except that the antenne are 
only half as long as the body. Last joint of the ovipositor 
nearly one-third longer than broad. Length 2 mm. to 4 mm.” 
(Coquillett.) 
A number of specimens, over twenty in all, were obtained at 
several points in Mammoth Cave. One locality is in the small 
dome in the Labyrinth, near the Bottomless Pit ; another, is 
the Mammoth Dome, in another part of the cavern ; a third is 
at Richardson’s Spring, in Black-snake Avenue; and another 
is at the bottom of Gorin’s Dome. At Richardson’s Spring was 
found an apple quite decayed in which hundreds of the larval 
forms of this species were found, and nearly a hundred secured. 
Careful search in suitable localities failed to disclose the pu- 
parium of this form. It appears to be quite abundant in the 
damper portions of the cavern. 
Phora rufipes Meigen * 
(Translation.) “Black, halteres white, legs reddish-yellow, 
wings hyaline. It differs from the foregoing [annulata’ Meig. 
* Klassifikazion und Beschreibung der europaischen zweifliigligen Insekten, 
p- 313, 1804. (Work not accessible. 
Systematische Beschreibung der bekannten europaischen zweifliigligen In- 
sekten, pp. 216-217, 1830. 
