14 
10. 
1 
12, 
13. 
PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 62. 
Third antennal joint long and appearing annulated, the labrum narrow. 
Ozodiceromyia Bigot. 
Third antennal joint not thus, first and second antennal joints with many 
bristles -. cae a ga . Euphycus Krober. 
Small species ae cna oll peeiede vein i Cut coaleseine with M-3; anten- 
nae very short..........- E ...-... Caenotus, new genus. 
Larger species with anne Pome real pcnpeller bowlers venation normal, at 
leastall, the cells pyrenenit ao 05 ec eee erecta hay tec aa ee ee ena 5. 
Upper face hairy; more or less heavily built species, usually gray or brown 
pollin.ose; ‘the males thickly PMOse an. fee see ese cies sar sealer ee 6. 
Upper face bare; usually more slender, less pollinose and pilose species.... 7. 
Wing with a cross vein connecting R-5 and M-1 outside the r-m cross vein; 
first antennal joint large and long bristled; eyes of males separated. 
Metaphragma Coquillett. 
Wing venation normal, the first antennal joint not large and swollen; eyes of 
males contiguotis. tq s9rtce} Pers! Eble Tey We. Thereva Zetterstedt. 
Third antennal joint two and one-half to four times as long as first; slender 
speelies, the malestdichoptici Een MAUI RIIG sh Henicomyia Coquillett. 
Third antennal joint at most two timesas long as first; abdomen not very slender 
and. More yPilgse junk Cesk CI le etic otal SEN ae ti one 8. 
Face projecting; first antennal joint large and shining, the style small and in 
a lateral pit some distance from the apex of the third ‘citi 
Nebritus Coquillett. 
Face not nearly horizontal; first antennal joint pollinose................-- 9. 
Eyes of male widely separated; first antennal joint about two times as long as 
the third, swollen, hairy; lower frons with considerable pile. 
Tabuda Walker. 
Eyes of male contiguous or nearly so (except in Psilocephala latifrons, new 
species); lower frons hearly-pareot pile. Ue eee ne ee ene oe eee 10. 
First antennal joint as large as in Tabuda, the third joint more slender; male 
abdomen with silvery white pile, the genitalia pollinose. Dialineura Rondoni. 
First antennal joint proportionately smaller; male genitalia usually shining; 
mostly slender SpeCles. 2 no. 42a eee celebs O86 eee ek ote ee eee Li. 
Antennae on a prominent convexity, the style as long as third joint and com- 
posed of two almost equal joints and an apical bristle; female genitalia flat- 
tened, more or less pointed, with an upper and lower plate and no circlet of 
bristles; vein Cu-1 and M-8 coalesce and do not reach the wing margin. 
Pherocera, new genus. 
Antennae with a much shorter style, usually only one joint visible; veins Cu-1 
and M-3 if coalescing reach the margin of the wing; female genitalia rounded 
and! with a termingl’circlet'ot blunt spines i271). 2- 2 este oe eer 12: 
Antennal style near the tip of the third joint, but in a hollow at the side and not 
apical; wings banded; front tibiae enlarged; frons of female with a single 
black spot/in: the mid dle. 2 jo eee Se arn oe hes cone Epomyia, new genus. 
Not with the above assemblage of characters... tcc on aeed te ice eor eee 13. 
Antennae with a terminal style; front tibiae not enlarged; wings not banded. 
Psilocephala Zetterstedt. 
The style projects from under the tip of the third antennal joint. 
Furcifera Kréber. 
CAENOTUS, new genus. 
Rather small, dark-colored species with hyaline wings. The genus 
is not closely related to any other described from North America. 
The antennae are short, with a very small subapical style and a few 
