Lagideus albitarsis Malaise

Smith, David R., 2012, The South American genus Lagideus Konow (Hymenoptera: Pergidae: Syzygoniinae), a Supplement, Zootaxa 3413, pp. 1-18 : 9-10

Lagideus albitarsis Malaise

( Figs. 9, 10 , 20 )

Lagideus albitarsis Malaise, 1942: 110 .

Female. Length, 6.0 mm. Antenna and head black, posterior half to third of clypeus and supraclypeal area white. Thorax and abdomen black. Fore and midlegs white, coxae black, femora brown to black on inner surfaces; hind leg black, with trochanters, basal third of femur, basal third of tibia, extreme apex of basitarsomere, and apical 4 tarsomeres white. Wings hyaline; veins and stigma black. Head: Vertex and frons shiny, with scattered, widely spaced punctures; covered with fine, white hairs. Antenna stocky, very slightly serrate with antennomeres 3–7 each slightly wider at apex than at base; antennomere 3 subequal in length to 4, antennomeres 5 to apex slightly decreasing in length; antennomeres 5–7 each about 2 × longer than broad. Malar space linear. Thorax: Hind basitarsomere slightly longer than length of remaining tarsomeres combined. Inner hind tibial spur about 0.75 length of hind basitarsomere. Abdomen: Sheath in lateral view straight above, rounded at apex, in dorsal view broad at base and tapering to acute apex (similar to Smith 1990: fig. 299). Lancet ( Fig. 20 ) with about 16 serrulae; serrulae low, pointed at apices, with fine anterior and posterior subbasal teeth, and slightly decreasing in depth toward apex; annuli 1–6 with fine short hairs of uniform width; annuli 7 to apex lacking hairs.

Male. See Malaise (1942), Smith (1990).

Specimens examined. Argentina: Misiones, Loreto, VI-2002, P. Fidalgo & L. Stange, Malaise trap (5 3, FSCA); Argentina: Misiones, Loreto, X-XI-2002, P. Fidalgo, Malaise trap (1 Ƥ, 10 3, FSCA); Brasilien, Nova Teutonia, 27°11’B, 52°23’L, 300-500 m, 10-12 1960, Fritz Plaumann (1 Ƥ, USNM), same except. 6.X.1956 (1 3, USNM).

Remarks. Only the male was known,which was described by Malaise (1942) and included in my 1990 key. The female is associated by a series of specimens from the same locality. The female will go to couplet 13 of my 1990 key but will not fit either half of that couplet. It is separated from species in couplets 13 and 14 by the white hind tarsomeres 2–5 and only the extreme apex of tarsomere 1 white and the lancet with the short, uniform length of the hairs on annuli 1–6 and lack of hairs on annuli 7 to apex. Lagideus luticus has long dense spines on the dorsal halves of annuli 4–12 of the lancet ( Smith 1990: fig. 318), and L. mulsus Smith, 1990 , and L. oranus Smith, 1990 , have the hind tarsi completely black. This species was known only from southeastern Brazil (Santa Catarina) and Uruguay. This is the first record from Argentina.

The male antenna is similar to Fig. 26 . The series of males examined have the pronotum, tegula, part of the mesonotum, and dorsal spot on the mesepisternum orange. There is some variation in the amount of orange on the mesonotum which may be almost entirely black with only the prescutum and part of the scutellum orange to mostly orange with only the lateral lobes black.

Lagideus crinitus Konow was described from “ Argentina ” but without an exact locality. I have yet to see additional specimens of this species. The holotype female (at SDEI) has the thorax orange with black on the pronotal lateral lobes, extreme edge of scutellum, metanotum, and mesosternum, the abdomen orange, and the fore and midtarsi white and hind tarsi completely black. With the association of the female described here, L. crinitus cannot be the female of L. albitarsis .

Figures

FIGURES 9 – 10. Lagideus albitarsis. 9, Lateral view. 10, Dorsal view of head and thorax.

FIGURES 19 – 23. Female lancets. 19, Lagideus flavus. 20, L. albitarsis. 21, L. longicus. 22, L. tapanti. 23, L. isidro.

FIGURES 24 – 26. Male antennae. 24, L. schmidti. 25, L. longicus. 26, Lagideus, unidentified species.