578 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 113 
There are cases, however, where I am at present unable to distinguish 
the females of certain species. The collection and study of more 
material may reveal intraspecific variations that make this key in- 
correct. 
Key to the Species of Amoebaleria 
1. Mesopleuron with setae on posterior half. . ... es ke 
Mesopleuron bare, except for occasional setae near the} pr Caiceem ee 
2. Surstylus of male not curved downward at distal end, but straight and 
fingerlike ..... ... . . defessa (Osten-Sacken) 
Surstylus of male cur od oa nw aed = Hest end. . . . . sackeni Garrett 
3. Two sternopleural bristles; entire body yellow to yellowish orange. 
flavotestacea (Zetterstedt) 
One sternopleural bristle; body color variable. . . . . ee: 
4. Wings clouded along one or both crossveins and (or) ae tae ends of longi- 
tudinal veins... » «J <4 2 eo 
Wings not clouded plate eineve crossvein, carl = ane :. << 2 eee 
5. Anterior and posterior crossveins clouded; ends of longitudinal veins not 
clouded; thorax bluish gray... . . . . . infuseata, new species 
Posterior crossvein clouded with light ae own; anterior crossvein not clouded; 
ends of longitudinal veins clouded; thorax mostly yellow. helvola (Loew) 
6: ‘Thorax yellow to reddish orange ...-.... . .\. 21> ..32) ee 
Thorax bluish gray, sometimes brownish. . ............. 9 
7. Cheek-eye ratio greater than 0.65... ... . . . . . perplexa Garrett 
Cheek-eye ratio less than 0.55 . . . 5 oe ee 
8. Distal portion of epiphallic process of aes Ww ethout Tease bend near the 
tip . . . . confusa (Wahlgren) 
Distal portion of puinhallie peace of male as a distinct bend near the tip. 
ee Garrett 
9. Buccal setae in & single row... : oaks Rt 
Buccal setae in 2 or more rows or ecpainete pieced so as aot to appear ina 
single row. . . « 2 ene 
10. Epiphallic process ae el curving oes oan a pounded obtuse angle; 
bluntly rounded apically; entire distal portion with small scattered spines. 
scutellata Garrett 
Epiphallic process of male turning posteriorly at a sharp angle, with apex 
slightly expanded or swollen; distal portion with small spines at apex only. 
gonea Garrett 
11. Humeri bluish gray, concolorous with the disk of mesonotum .... . 12 
Humeri yellow to yellowish brown, in contrast to bluish gray disk of meso- 
notum ... 2 “iS Bel 
12. Male with distal eae of paabalne eee a aoe the aug longer than 
the length of the surstylus; no authentic record from North America. 
eaesia (Meigen) 
Male with distal portion of epiphallic process (beyond the angle) no longer 
than the surstylus. . . . . . . glauea (Aldrich) 
13. Anterior crossvein at about the io = of the ee of discalcell . . . . 14 
Anterior crossvein at a level distinctly beyond the middle of discal cell. 
tularensis, new species 
14. Surstylus of male very narrow, reveals the distal portion of the much broader 
epiphallic process. . . .......... . . sabroskyi, new species 
