156 Psyche [Sept.-Dee. 
One male from Matucana, Peru, May 2 7, 1929 (Cornell Uni- 
versity Expedition) . 
Among the Neotropical species this is related to M. obscurata 
Enderlein to which it will run in Borgmeier’s key (Rev. Entom., 
vol. 5, p. 441) but differs in the frontal chaetotaxy. In Borg- 
meier’s earlier paper (Arch. Mus. Nac. Buenos Aires, vol. 25, 
p. 139) it falls near M. stephanoidea Borgm. and M. concava 
Borgm., from either of which it may be distinguished by the 
lengths of the costal divisions and it lacks the bristles present 
on the sixth abdominal tergite in M. stephanoidea , although this 
may be a secondary sexual character. It resembles also M. 
opilionidis Borgmeier, but the ovipositor is not chitinized and 
there are only two scutellar bristles. 
Megaselia {sens, str.) rimacensis sp. nov. 
9 . Length 1.7 mm. Front and abdomen black; thorax above 
dark fuscous; pleurae lighter brown below; front legs and all 
coxae pale yellowish; four hind legs brownish yellow with the 
hind femora indistinctly blackened at tips. Antennae black; 
yellow-brown at the base of the third joint; palpi light brown. 
Wings hyaline, the heavy veins light fuscous; halteres honey 
yellow. Front subshining, not polished, with a deep median 
groove. Four postantennal bristles, the lower pair half as long 
as the upper ones and very much more slender; antial bristles 
inserted at the same level as the lowest lateral bristles and sep- 
arated from them by less than one-third the distance to the 
upper postantennals ; middle row of four bristles equidistant, 
curved downwards medially, the median bristles midway be- 
tween the ocelli and postantennal bristles; third joint of an- 
tennae much enlarged and flattened, at least as broad as two- 
thirds the height of the front. Palpi slightly flattened, with five 
or six rather small bristles. Mesonotum strongly convex, shin- 
ing; one pair of dorsocentral bristles very close to the semi- 
circular scutellum, which bears one pair of widely separated 
long bristles and a single pair of minute hairs. Propleura with 
several bristles above and below, near the posterior margin. 
Mesopleura entirely bare, slightly roughened and dull on its 
upper portion behind. Surface of abdomen opaque above; sec- 
ond to fifth segments slightly decreasing in length; sides of 
second tergite with half a dozen bristly hairs at each side; all 
the tergites with a series of minute, bristly hairs along the 
