Pieza Evenhuis

Evenhuis, Neal L., 2002, Pieza, a new genus of microbombyliids from the New World (Diptera: Mythicomyiidae), Zootaxa 36, pp. 1-28 : 26

Key to the species of Pieza Evenhuis

1. Scutellumyellowtobrownishyellow;yellowtobrownishyellowprescutellarmarkpresent 2

— Scutellum black to brown; prescutellar mark absent, indistinct, or brown, not yellow 9

2. Front black; abdominal tergites IV­VI yellow to yellow fasciate on posterior margins 3

— Front yellow to white; abdominal tergites predominantly brown to black in color, yellow color, if present, restricted to narrow fascia on posterior margins 5

3. Mesonotum with vittae ... ( Brazil).............................. kake , sp. nov.

— Mesonotum without vittae.............................................. 4

4. Abdomen with yellow fasciae on posterior margins of tergites (Florida)................................................................... rhea , sp. nov.

— Abdomen dark brown, without contrasting fasciae (Dominican amber)................................................................ dominicana , sp. nov.

5. Occiput swollen posteriorly ( Fig. 6 ), with paired admedian pollinose diadema; body color generally brownish ... (Galápagos, Curaçao, Dominican Republic)................................................................. sinclairi , sp. nov.

— Occiput not swollen posteriorly ( Fig. 5 ), without paired pollinose diadema; body color generally blackish 6

6. Occiput predominantly yellow, black only surrounding occipital foramen (some specimens with small narrow extensions of black angling upward to posteromedial corners of eyes) ( Fig. 10 ).... ( Venezuela).......................... deresistans , sp. nov.

— Occiput predominantly black, or with yellow restricted to lower half............ 7

7. Lower half of occiput yellow; mesonotum with admedian yellow vittae.......... 8

— Lower half of occiput brown to black; mesonotum without vittae; face yellow to brown ........................................... minuta (Melander) , comb. nov.

8. Occiput with yellow triangular spot directly behind ocellar tubercle; face black; proboscis extending well beyond oral margin ... (southwestern United States).................................................... ostenta (Melander) , comb. nov.

— Occiput without yellow triangular mark behind ocellar tubercle; face with some yellow color; proboscis shorter than head height ... ( Bahamas Is, Mexico).. pi, sp. nov.

9. Front black; interhumeral and post humeral marks absent.................................................................... agnastis (Hall) , comb. nov.

— Front yellow; interhumeral and post humeral marks present................... 10

10. Hind tibia brown ... (North America)............. angusta (Melander) , comb. nov.

— Hind tibia yellow ... ( Venezuela)........................... flavitibia , sp. nov.

Figures

FIGURE 10. P i e z a deresistans, sp. nov., occiput, poste­ rior view.

FIGURES 5 ­ 6. Pieza heads, scanning electron micrographs. 5. Pieza angusta (Melander). 6. Pieza sinclairi, sp. nov.