sept. 1898 ] Coquillett: On Dipterous Family Scatophagidve. 163 
base of palpi yellow, remainder white, halteres, femora, tibiae and tarsi yellowish, 
wings hyaline; face silvery white, body brownish gray pruinose. Length, 5 mm. 
White Mts., N. H. Two males collected by the late H. K. Mor¬ 
rison. Type No. 4097. 
Chaetosa, gen. nov. 
The type species is Cordylura punctipes Meig., of which the Na¬ 
tional Museum possesses two specimens from Minnesota, one from Colo¬ 
rado and two from Holland. This species could never be identified by 
the use of Becker’s monograph, since he places it in the genus Tricho - 
palpus , to which, both in the table of genera and in the definition of the 
v genus, he attributes a single sternopleural macrochaeta. The palpi are 
sub-lanceolate, slightly flattened, and at the apex of each is a black 
bristle which is much longer than any of the adjacent ones. 
Acicephala, gen. nov. 
Closely related to Cordylura but readily distinguishable by the 
elongated, flattened head and very oblique face. Type, the following 
species: 
Acicephala polita, sp. nov. 
Black, the face, cheeks, palpi, halteres, coxae, femora, tibiae and tarsi, yellowish; 
front, except the ocellar-triangle, inner side and apex of second antennal joint, face, 
cheeks and pleura white pruinose, the occiput, mesonotum, scutellum and abdomen, 
polished; second joint of antennae prolonged over the inner side of the first nearly to 
the arista, the third joint two and one-half times as long as broad, only slightly longer 
than the second, arista rather long plumose, thickened on the basal fifth, the penulti¬ 
mate joint broader than long; eyes bare, nearly perpendicular, only slightly higher 
than long; vibrissae more than twice as long as the adjoining bristles, lateral oral 
margin bearing three or four black bristles on its anterior half; palpi clavate, slightly 
flattened, bearing several long yellowish bristles near the middle, a few short black 
ones at the tip besides one which is nearly as long as the palpi; proboscis robust, only 
slightly over twice as long as thick. Mesonotum almost destitute of bristly hairs, five 
stout dorso-central macrochaetae, one prothoracic, one sternopleural, and two on the 
scutellum; abdomen less polished than the mesonotum, destitute of stout macrochaetae, 
its hairs black, those on the venter except at the apex, whitish. Wings hyaline, 
tinged with brown along the veins, third and fourth veins toward their apices parallel 
the fourth ending far beyond the apex of the second, small crossvein beyond the mid¬ 
dle of the discal cell, and far beyond the tip of the first vein, all veins bare. All 
femora and tibiae bearing macrochaetae, hind tibiae each bearing three pairs on the 
outer side beside those at the tip. Length, 7 to 8 mm. 
Colorado. One male and three females. Type No. 4098. 
Acicephala pilosella, sp. nov. 
Same as the above description of polita with these exceptions: Face, cheeks, 
palpi, coxae and femora black; pruinosity of front, face, cheeks, and pleura, brownish 
