Research Article

Four New Species of Dryocosmus gallwasps from Taiwan (Hymenoptera: Cynipidae: Cynipini)

Table 1

Key to the Dryocosmus Species of Tiwan.

(1)– Female(2)
– Male(5)

(2)– Mesosoma distinctly longer than high in lateral view, compressed dorsoventrally; mesopleuron with distinct transversely orientated numerous delicate striae in mid height, forming distinct bent across entire length of mesopleuron (Figures 2(12), 5(34)); posterior tentorial pits large, deep, elongate; occipital foramen very slightly higher or equal to height of postgenal bridge, lower half of which narrow, stripe-like (Figures 1(3) and 4(25))(3)
– Mesosoma nearly as long as high in lateral view, not compressed dorsoventrally; mesopleuron and speculum uniformly smooth and shiny, without transversely orientated striae at mid height (Figures 8(53) and 11(74)); posterior tentorial pits small, rounded; occipital foramen nearly 1.5x higher than height of postgenal bridge which short, triangular-like, continuously narrowed down towards hypostomal carina (Figures 7(45), and 10(63))(4)

(3)– POL 1.4x longer than OOL (Figure 1(2)); scape + pedicel longer than F1 (Figure 1(7)); scutellar foveae transverse ovate, with shiny bottom and few wrinkles on it, divided by central elevated area which only slightly narrower than width of fovea (Figure 2(11))pentagonalis
– POL 1.8x longer than OOL (Figure 4(24)); scape + pedicel only 1.2x longer than F1 (Figure 4(29)) scutellar foveae transverse ovate, with shiny bottom and few wrinkles on it, divided by central narrow elevated area (Figure 5(33))triangularis

(4)– Height of eye 3.5x longer than length of malar space; POL longer than OOL; OOL 1.7x longer than diameter of lateral ocellus, 1.8x longer than LOL (Figures 7(43)-(44))carlesiae
– Height of eye 2.25x longer than length of malar space; POL shorter than OOL; OOL 3.0x longer than diameter of lateral ocellus, 2.7x longer than LOL (Figures 10(61)-(62))testisimilis

(5)– POL at least 3.0x longer than OOL; ocelli large, at least 3.0x larger than length of OOL (Figures 1(6) and 4(27))(6)
– POL slightly longer than OOL; ocelli smaller, length nearly equal to length of OOL (Figures 7(48) and 10(67))(7)

(6)– Height of compound eye 8.1x higher than length of malar space and 1.2x higher than length of transfacial distance (Figure 1(5)); pedicel definitely shorter than scape (Figure 1(8))pentagonalis
– Height of compound eye 8.7x higher than length of malar space and 1.4x higher than length of transfacial distance (Figure 4(26)); pedicel nearly as long as scape (Figure 4(30))triangularis

(7)– OOL 1.6x longer than length of lateral ocellus; interocellar area alutaceous, like frons (Figure 7(48)); scape + pedicel equal in length to F1, F3 shorter than F2 (Figure 7(50))carlesiae
OOL 1.8x longer than length of lateral ocellus, interocellar area coriaceous, with more dull sculpture than frons (Figure 10(70)); scape + pedicel shorter than length of F1, F2 = F3 (Figure 10(67))testisimilis