1925 ] Myrmecophilous Phoridce from the Neotropical Region 307 
placed behind close to the lateral angles. Fifth segment with 
a gland opening which lies within a quadrangular chitinous rim 
that arises from the front margin of the fifth plate. Abdomen 
bearing twenty-four greatly enlarged marcochaetje, each about as 
long as the hind tibia. These are arranged in four transverse 
rows, three bristles at each side of each abdominal plate. Where 
each is inserted to the pale abdominal membrane there is a small 
rounded dark brown spot. These stout, intensely black bristles 
are very conspicuous and together with the blackish wing pads 
give the insect a most extraordinary appearance. Legs rather 
long and not very stout; the hind femora rather noticeably com- 
pressed. 
Type and three paratypes from Huascato, Jalisco, Mexico 
(W. M. Mann). These were taken in a nest of Pheidole sp. 
Another specimen from San Diego de Cocula, Jalisco, Mexico 
(W. M. Mann) was taken with Eciton. 
The small wings are unusually dark and heavily chitinized, 
but are evidently very weakly attached to the body as one spe- 
cimen has lost both wings and two others had only one wing re- 
maining attached when I received them. 
Ecitophora costaricensis sp. nov. 
cT. Length with abdomen well extruded 1 .6 mm.; without 
tubular apex of abdomen, 1.3 mm. Length of wing 0.30' mm.; 
of dorsum of thorax 0.24. Front with 14 bristles comprising 
four strong post-antennal ones of which the upper ones are twice 
as far apart as the lower, four in the lower frontal row disposed as 
a pair close to each eye with the outer bristle well above the 
inner one, six in an upper row close to the vertex with the lateral 
bristle near the eye margin. Head covered with coarse, well sep- 
arated hairs, very conspicuous on the sides below the eyes; 
cheek with a strong downwardly directed bristle. Palpi rather 
slender, each with six strong bristles. Eye elongate oval, longer 
than the third antennal joint, but only about two-thirds as 
wide; ocelli present, well developed. Third joint of antenna 
subovate, as long as broad; arista distinctly longer than the 
head-height. Thorax above with eight bristles, one at each 
