FAM, EMPIDID/E 95 
(1909); Coquillett, Proc. U. S. Nat. Mus. Vol. 37, p. 553 (1910); Wahlgren, Ent. Tidskr. Vol. 31, 
P- 44, 65 (1910). 
Characters. — Blackish species measuring three or four millimeters in length, not closely 
related to any of the other genera. Head almost globular, the occiput rather flattened, eyes bare, of 
the male broadly contiguous along the front, the ocellar triangle elevated, the upper facets large, of the 
female widely separated, the front quadrate and bearing six minute fronto-orbitals, face broadly receding 
but wide, especially in the male ; antennz located below the middle of the head, apparently two-jointed 
since the basal joints are completely fused into a small globular nearly bare segment, the last joint 
compressed and broadly orbicular, ending in a short two-jointed style, whose basal joint is quadrate and 
whose outer joint consists of a short stubby bristle; proboscis short and thick, smaller and retracted in 
the male, protruding obliquely forward in the female, palpi short, horizontal and gradually thickened; 
occiput not bristly above but seriately hairy, one pair of ocellar bristles. "Thorax markedly bristly, 
about four humerals, three posthumerals, five notopleurals and several scutellars, the dorsocentrals 
numerous, acrostichals biseriate, quite a number of lateral setula beyond the dorsocentral rows; meta- 
pleurz bare, pectus with some bristles at the base of the coxze. Abdomen of the female subequal to the 
thorax in length, of the male one-half longer, eighth segment of the female broadly conical, almost wedge- 
shaped and strong; pygidium robust, globose, the dorsal valves large and erect, the lateral valves rather 
hemispherical and with two blunt posterior prongs, penis hidden. Legs strongly bristly, anterior femora 
of the female with two flexor rows of bristles, tibia of both sexes with several sets of bristles, tarsal joints 
more or less setose. pulvilli large. Wings not colored, rather pointed, anal angle strongly rectangular, 
costa stopping at the tip of the wing, auxiliary vein distinct and extending into the costa, a thickened 
stigma between the ends of the auxiliary and first veins, third vein with a long fork, discal cell located 
before the middle of the wing, the basal and discal cells not large, the sections of the fifth vein nearly r1: 
2, anal crossvein reflexed less abruptly than usual, angulate with the anal vein, the latter confluent with 
the under side of the anal cell, second basal and anal cells of equal width, a small alula present; calypteres 
with a strong fringe. 
Type species : H. obliterata, the only species occurring in Europe. On many occasions I have 
taken specimens of Hormofeza on the window-panes in houses. | The affinities of this genus are not clear. 
In 1908, when stressing the importance of the form of the anal cell, I located Hormofeza in the Ocydro- 
miinz, in which group it would be distinct in having the third vein furcate. It seems more likely that 
the genus is a specialized but ancient offshoot of the Oreogeton branch of the Empidinz. 
KEY TO THE SPECIES OF HORMOPEZA 
Eyes of male separated; joints of anterior tarsi rounded at ends; 
basal dorsal process of pygidium rather wide and erect. . . . H.sENATOR, nov. sp. (1). 
EX OLG D'GHODICODMSHOHS cool e Ve MDES Nur LUE RM S uos re ut Visa 
(1) Hormopeza senator, nov.sp. — Male. Length 3 mm. Black, head and thorax entirely covered with 
cinereous pollen ; abdomen shining ; first and most of second segment lightly cinereous pollinose, extreme base of segments 
three and four similarly pollinose. Eyes narrowly separated on the front, the facets uniform, antenne brown, the 
third joint short, ovate; proboscis short, black, together with the yellow palpi reaching forward; occipital hairs pale 
yellow. Thoracic hairs yellow; hairs of abdomen pale; pygidium lightly pollinose, its ventral setze yellow and apical 
hairs brown, dorsal process wider than usualand erect, side valves terminating in a very large, oblong process whose 
lower apical angle is rounded, above at the base of this process the side valve is continued inward as a short, robust 
tooth. Legs brown, the coxe testaceous, joints of anterior tarsi rounded, oblong; pulvilli whitish, one-third as long 
as last tarsal joint; bristles of hind tibiae blackish; hind femora with fringe of short sete above. Wings hyaline, 
veins thin and pale, apex of costal cell scarcely differentiated. 
Holotype, Washington D. C., 17 August, 1913. 
