Key to the species of Euvelia [modified from Polhemus & Polhemus (1984)]

1 Body long (> 2.7 mm); male fore femur with a tuft of brown setae on anteroventral third (Fig. 6); female pronotum with longitudinal shining area, subequal in width to antennomere I (Fig. 4)........................ Euvelia mazzucconiae sp. nov.

- Body short (<1.50 mm); male fore femur without tuft of brown setae on anteroventral third; female pronotum without longitudinal shining area..................................................................................... 2

2 Body very broad (maximum width 1.05 mm); connexival segments I and IV with silvery hair patches; connexives without pruinose areas....................................................... Euvelia discala J. Polhemus & D. Polhemus

- Body less broad (maximum width 0.95 mm); connexival segments without silvery hair patches; connexival segments II and

IV–VII (at least) with pruinose areas...................................................................... 3 3 Male fore trochanter produced distally into a distinct spur (Fig. 7); female width across humeri about 1.5 times width of head across eyes; females without glabrous area on pleura........................................ Euvelia advena Drake

- Male fore trochanter not or only slightly produced; females with a glabrous area on pleura or humeri almost twice as wide as head across eyes...................................................................................... 4

4 Female broad, with short to moderately stout setae and no glabrous area on pleura; male with a short anteriorly directed spur or tuft of soft setae distally on fore trochanter (Fig. 8)........................... Euvelia lata J. Polhemus & D. Polhemus

- Female narrower, without stout setae, but with a depressed glabrous area on pleura; males without spur or tuft on fore trochanter..............................................................................................