15 
ART. 4, 
short bristles on the first two joints. The eyes are contiguous in the 
male and widely separated in the female; in the male the facets on 
upper two-thirds of the eye are much larger than those on the lower 
third, the line of demarcation being quite distinct. Frontal triangle in 
male very small. The eyes run to the bottom of the head, scarcely 
any cheeks being visible from the side; face small and bare. Pro- 
boscis and palpi long pilose. The body in general sparsely pilose, 
with no distinct spines on the thorax and abdomen, those on the 
legs being very small and hairlike. Genitalia of male quite promi- 
nent and differing from other known genera in general form; the 
female genitalia muchas in Thereva, with a terminal circlet of spines. 
Abdomen of male about twice as long as thorax. Venation quite 
different from other known genera; vein Cu-1 coalesces with M-3 
either at the base, there being no cell M-3 or m-—cu cross vein, or 
there may be a partial coalescence as in C. wnornatus. 
Genotype.—Caenotus vnornatus, new species. 
TABLE OF SPECIES 
1. Thorax with sparse erect white pile; vein Cu-1 coalescing with M-3 for most of its 
length (three veins from the discal cell)................minutus, new species. 
2. Thorax with more dense yellowish white pile eran eee species; vein Cu-l 
and M-3 united for a short distance near the base but ending separately and 
wide apart in wing margin (four veins from discal cell). 
inornatus, new species. 
CAENOTUS MINUTUS, new species. 
Plate 1, fig. 4. 
Male.—Length 4 to 5.5 mm. Head black, including the antennae, 
the pile white; small frontal triangle gray pollinose. Antennae short, 
the first joint about twice the length of the second, both with a few 
short hairs; third joint a little longer than the first two combined 
and much broader at the base, the apical portion ending in a micro- 
scopic bristle. Palpi blackish with long white pile. 
Thorax and scutellum opaque black, thinly gray pollinose with 
sparse erect white pile, not dense enough to obscure the ground color. 
Pleura thinly gray pollinose with some fine white pile. Knobs of the 
halteres yellow, the stems yellowish brown. 
Abdomen black, thinly gray pollinose with erect white pile, ionger 
on the first four segments, short on the prominent genitalia; the two 
lateral lobes of the epiproct yellowish on the apical half and prolonged 
a little beyond the hypandrium. Legs black or blackish brown, 
knees yellowish; femora gray pollinose; bristles of legs small, fine, 
pale, hardly noticeable under low magnification. Wings hyaline, the 
veins brown or yellowish; R-—4 nearly straight beyond the fork; Cu-1 
coalescent with M-3 for most of its length, there being no m-—cu cross 
vein or cell M—3 (fourth posterior cell); stigma yellowish. 
