1945] Ten New Species of Empididce 81 
Chersodromia insignita, n.sp. 
Length 2 mm. Body black, overlaid with brownish gray 
pruinosity, the sternopleura mostly polished; hairs and bristles 
black; base of legs dark; wings maculate. Front about twice as 
long as width at middle, sides of face diverging below, the face 
about three times as long as width at antennae; two vertical 
bristles, one pair each of converging and diverging ocellar bris- 
tles; antennae black, third joint orbicular, style subdorsal, about 
three times length of third joint; proboscis black, but little pro- 
jecting beyond the palpi, which are large, flat, orbicular and 
glistening white in the male and duskier but glistening in the 
female. Two dorsocentrals, one humeral, three intra-alar, one 
post-alar, scutellum with two bristles and two small lateral hairs. 
Abdomen of male stoutly cylindrical; seventh tergite oblique, 
lengthened on right side and with hind margin setose, eighth 
segment filling in the shortened left side of the seventh segment 
as a shining black triangular plate which is long-setose behind; 
abdomen nearly bare; pygidium massive, shining above, the 
globular ventral part pruinose like the preceding abdominal 
segments, claspers wide and stout. Coxae mostly blackish, legs 
robust, all femora stout, piceous, knees, tibiae and base of tarsi 
brownish; front tibiae swollen and bearing a preapical flexar 
bristle, middle tibiae with two widely separated extensor bristles, 
of male narrowed on apical third where there is a flexar strigil 
of about ten short spines, hind tibiae with about ten irregular 
bristles toward tip; metatarsi cylindrical, the front ones two- 
fifths the tibial length. Wings fully developed, basal half whit- 
ish hyaline, with a strong sudden infumation in marginal cell 
beginning opposite crossveins and diminishing but pervading 
apical half of wing, veins white to, and including, crossveins but 
apically brownish, costal ratio 12:4:6:3, basal costal bristle 
black, costal hairs black, hairs of hind margin pale, second vein 
noticeably diverging from third, sections of fifth vein 5:4; hal- 
teres black, the short stalk brown; alulae and hairs blackish. 
Monterey, California; 25 September 1934, twelve specimens. 
This is the only species of Chersodromia having an extended 
stigmatic spot on the wings. 
Coloboneura nubifera Coquillett, from Alaska, likewise pos- 
sesses a dark wing-cloud. It measures three to four millimeters 
and differs in having the darkening of the wings restricted to 
