Two new species of Dasyhelea Kieffer and the immature of D. azteca Huerta & Grogan from northwestern Argentina (Diptera: Ceratopogonidae)

Two new species of Dasyhelea Kieffer, D. yunga and D. allegrae, placed in the grisea and mutabilis species groups respectively, are described, illustrated and photographed based on pupae and male and female adults. In addition, the immatures of D. azteca are described for the first time. The specimens were collected in the southernmost area of the Argentinean Yungas. The pupae of D. yunga and D. allegrae were examined using a Compound Microscope (CM), while the larva and pupa of D. azteca by a Scanning Electron Microscope (SEM) and CM.