Key to the Peruvian species of Dasiops Rondani
After Korytkowski and Ojeda(1971)), updated by I. MacGowan 2012
1. Lunule with setulae extending ventrally to below the base of the antennae …………… 2
— Lunule with setulae extending ventrally to at most the level of the antennal bases ……… 3
2. Basal tarsomeres yellow; post-ocular setulae extremely long, as long as ocellar
seta. . D. superciliosus McAlpine
— tarsomeres entirely black; post-ocellar setulae normal. . . D. hirtifacies Hennig
3. Tarsomeres entirely black or at least dark brown ……………………. 10
—At least the basal tarsomere yellow or yellowish brown ……………. 4
4. Frons clearly roughened …….. 5
— Frons completely smooth or at most with very faint ridges ….. . . 8
5. Body glossy metallic green, frons very roughened ………….. 6
— Body bright blue, frons less roughened …………………….. 7
6. Calypteres and fringe entirely pale yellowish-white ………. D. aspredifrons McAlpine
—Calypteres brown-grey, with dark brown margins; fringe dark brown and with longer
setulae ….. D. rugifrons Hennig
7. Frons only very weakly roughened, one post-stgimatal
seta; body light blue-green; aculeus normal,,,,,, D. fervidus McAlpine
— Frons more heavily roughened two post-stigmatal setae; body dark blue-violet, stiletto- like female aculeus very short and
strongly tapered …….. D. ahusatus Korytkowski
8. Large species, about 6mm. post-ocellar setulae extremely long, as long as the ocellar setae, calypteres with fringe dark. . . . . D. chotanus Korytkowski
—Smaller species, less than 4 mm; post-ocellar setulae normal, calypteres with marginal fringe whitish ……………….. 9
9. Wing bi-coloured, basally yellowish-brown, apical third infuscated. .. D. jumigatus McAlpine
—Wing hyaline, with only a slight yellowish tinge which is slightly more intense basally . . .
D. fidus McAlpine
10. Large species, at less than 5.5 mm. length; marginal fringe of calypteres containing long, dark setulae. ……………………….. . 11
—Small species, less than 4 mm. length; marginal fringe of calypteres uniform in length ………………………13
11.Very large, 10 mm. length; calypteres with 12 long dark-yellow setulae,
frons very wide, 1.6x as wide as high ……………………… D. amplissimus McAlpine
— Smaller than 6 mm; calypteres with 5 to 10 black setulae in fringe; frons approx. as long as wide …………………. 12
12. Wing vein M1+2 completely straight, not curved forward at its apex … D. rectivenus Hennig
— Wing vein M 1+2 clearly curving towards R4 +5 at apex. …………………..
D. plumatus Hendel
13. Calypteres with brown margins and fringe ……………… 14
— Calypteres with yellow or whitish margins and fringe …….. 15
14. Wings distinctly bicoloured rather intensely yellow basally
and dark brown apically ……. D. inca McAlpine
— Wings almost hyaline, with a yellowish-brown tinge more intense basally, but not bicoloured ..... D. quadrisetosus (Malloch)
15. Wing completely hyaline, at most with a slight, uniform pale yellow tinge ……… 16
— Wing clearly bicoloured (as in D. inca) ………… D. peruanas Hennig
16. Prosternum completely bare, anepisternum with 5, wings with a slight
yellowish tinge ……………. D. aurulentus McAlpine
— Prosternum with a thin setula on each side; anepisternum with only 4 posterior setae; wing completely clear …. D. clarionus McAlpine