Vilga, Stal, 1860

Costa, Wanessa Da Silva & Barcellos, Aline, 2017, Contributions to the taxonomy of Vilga Stål (Hemiptera, Coreidae, Pseudophloeinae) with the description of a new species from southern Brazil, Zootaxa 4353 (1) : -

Key to species of Vilga (adapted from Dolling, 1977)

1 Pronotum deeply emarginate posteriorly ( Trinidad, Brazil, Paraguay, Bolivia, northern Argentina).... westwoodi (Kolenati)

- Pronotum shallowly emarginate posteriorly................................................................ 2

2 Abdominal sternites bearing spines at postero-lateral angles which are about as long as width of connexivum; pronotum very spinose. ( Guatemala, French Guiana, Brazil, Paraguay)............................................. dallasi Distant

- Abdominal sternites bearing spines at most half as long as width of connexivum; pronotum less spinose................ 3

3 Posterior femur with a single, small, subapical spine beneath. ( Peru, Chile, Argentina).............................. 4

- Posterior femur beneath with two major subapical spines and a group of three or four spine-like tubercules between distal spine and apex of femur. (Southern U.S.A. to southern Brazil)....................................................... 6

4 Length of antennal segment I at most 0.56 times width of head inclusive of eyes. ( Peru)................ peruviana Dolling

- Length of antennal segment I at least 0.65 times width of head inclusive of eyes.................................... 5

5 Apex of corium at rest reaching level of middle of laterotergite V, apex of membrane not reaching beyond posterior margin of tergite VII. ( Chile, Argentina, Brazil).......................................................... chilensis (Stein)

- Apex of corium reaching posteriorly to base of laterotergite VI, membrane projecting beyond posterior tip of body. ( Argentina)................................................................................... penningtoni Bergroth

6 Lateral margins of abdominal sternites almost smooth......................................................... 7

- Lateral margins of abdominal sternites distinctly granulate or tuberculate....................................... 10

7 Posterolateral spines of pronotum short, width of pronotum across tips of spines about 1.97 times width of head inclusive of eyes. ( Brazil)........................................................................................ 8

- Posterolateral spines of pronotum long, widely diverging, width of pronotum across tips of spines at least 2.09 times width of head including eyes.................................................................................... 9

8 Pubescence including some longer and more erect setae; antennal segment II more than half the width of segment I ( Brazil)........................................................................................ antennata sp. nov.

- Pubescence uniform in height; antennal segment II less than half the width of segment I ( Brazil)........ brasiliensis Dolling

9 Antennal segment I without tubercles, though with some large granules present. ( Panama, Guyana)....... divaricata Distant

- Antennal segment I externally with a row of projecting tubercles. ( Brazil).......................... sanctipauli Dolling

10 Antennal segments I–III clothed with suberect hairs longer than width of segment II, disc of hemelytral membrane with numer- ous crossveins; sometimes brachypterous. (Southern U.S.A. to El Salvador).......................... mexicana Distant

- Antennal segments I–III clothed with hairs shorter than width of segment II; disc of membrane without cross-veins; insect never brachypterous................................................................................. 11

11 Pronotum with posterolateral spines directed obliquely forwards. ( Brazil).............................. obliqua Dolling

- Pronotum with posterolateral spines directed laterally....................................................... 12

12 Lateral margins of abdominal sternites V–VII bearing granules no longer than broad. ( Costa Rica, Panama, Aruba, Guyana, Colombia, Brazil)....................................................................... dissimilis Distant

- Lateral margins of abdominal sternites V–VII bearing at least some tubercles longer than broad...................... 13

13 Antennal segment I about equal in length to width of head across antennifers. (Scutellum as long as its own basal width). (Bra- zil)................................................................................ serrulata Montandon

- Antennal segment I longer than head width across antennifers................................................ 14

14 Antennal segment I about equal in length to width of head inclusive of eyes; scutellum as long as its own basal width. ( Brazil)......................................................................................... grisea Dolling

- Antennal segment I shorter than width of head including eyes; scutellum distinctly longer than its own basal width. ( Brazil)...................................................................................... grisescens Dolling