Dryocosmus

Nicholls, James A., Melika, George & Stone, Graham N., 2018, New species of Dryocosmus Giraud gallwasps from California (Hymenoptera: Cynipidae: Cynipini) galling Chrysolepis Hjelmq. (Fagaceae), Zootaxa 4532 (3), pp. 407-433 : 410

Key to the Nearctic Dryocosmus species associated with Chrysolepis

1 Females............................................................................................. 2

- Males............................................................................................... 6

2 Head, mesosoma and metasoma reddish brown.............................................................. 3

- Head, mesosoma and metasoma dark brown to black......................................................... 5

3 Gena broadened behind eye, visible in anterior view ( Figs 69–70 , 86–87 )......................................... 4

- Gena not broadened behind eye, invisible in anterior view ( Figs 46–47 ).............................. rileypokei , sexual

4 Gena measured along ventral margin of eye broader than cross diameter of eye ( Fig. 89 ); forewing veins yellow ( Fig. 91 ); prominent part of ventral spine of hypopygium as long as broad from ventral view ( Fig. 96 )......... castanopsidis , asexual

- Gena measured along ventral margin of eye as broad as cross diameter of eye ( Fig. 72 ); forewing veins dark brown ( Fig. 74 ); prominent part of ventral spine of hypopygium greater than 3.0x as long as broad from ventral view ( Fig. 79 ).................................................................................................. rileypokei , asexual

5 F1 longer than F2 ( Fig. 5 ); gena very slightly broadened behind eye ( Figs 1–2 ); median mesoscutal line distinct, broad, reaching to 1/10 of mesoscutum length ( Fig. 9 ), mesopleuron with rugae along mesopleural triangle ( Fig. 8 )......................................................................................................... demartinii , asexual

- F1 equal F2 ( Fig. 25 ); gena not broadened behind eye ( Figs 18–19 ); median mesoscutal line in the form of a short indistinct triangle ( Fig. 29 ), mesopleuron smooth, without rugae along mesopleural triangle ( Fig. 28 )................... juliae , sexual

6 Placodeal sensilla absent on F1–F3, present on F4–F13 ( Fig. 55 ); occiput with numerous parallel striae ( Fig. 52 ), lower face with numerous delicate striae, inner margins of eyes parallel, clypeus not overhanging mandibles ( Fig. 50 )....................................................................................................... rileypokei , sexual

- Placodeal sensilla present on F1–F13 ( Fig. 26 ), occiput with few interrupted delicate parallel striae ( Fig. 24 ), lower face smooth, without striae, inner margins of eyes slightly converging, clypeus overhanging mandibles ( Fig. 22 )......................................................................................................... juliae , sexual

Figures

FIGURES 69–74. Dryocosmus rileypokei, asexual female. 69–72, head, female: 69, anterior view, 70, dorsal view, 71, posterior view, 72, lateral view. 73, antenna. 74, forewing, part.

FIGURES 86–91. Dryocosmus castanopsidis, asexual female: 86–89, head: 86, anterior view, 87, dorsal view, 88, posterior view, 89, lateral view. 90, antenna. 91, forewing, part.

FIGURES 46–56. Dryocosmus rileypokei, sexual generation. 46–49, head, female: 46, anterior view, 47, dorsal view, 48, posterior view, 49, lateral view. 50–53, head, male: 50, anterior view, 51, dorsal view, 52, posterior view, 53, lateral view. 54– 55, antenna: 54, female, 55, male. 56, forewing, part, female.

FIGURES 92–96. Dryocosmus castanopsidis, asexual female: 92–93, mesosoma: 92, lateral view, 93, dorsal view. 94, mesosoma and propleura, anterior view. 95, metascutellum and propodeum, posterodorsal view. 96, metasoma, lateral view.

FIGURES 75–79. Dryocosmus rileypokei, asexual female. 75, mesosoma, lateral view. 76, mesoscutum, dorsal view. 77, mesoscutellum, dorsal view. 78, metascutellum and propodeum, posterodorsal view. 79, metasoma, lateral view.

FIGURES 1–8. Dryocosmus demartinii, new species, asexual female. 1–4, head: 1, anterior view, 2, dorsal view, 3, posterior view, 4, lateral view. 5, antenna. 6, forewing, part. 7, mesosoma and propleura, anterior view. 8, mesosoma, lateral view.

FIGURES 9–13. Dryocosmus demartinii, new species, asexual female. 9, mesosoma, dorsal view. 10, mesoscutum and mesoscutellum, dorsal view. 11, metascutellum and propodeum, posterodorsal view. 12–13, metasoma: 12, lateral view, 13, dorsal view.

FIGURES 18–27. Dryocosmus juliae, new species. 18–21, head, sexual female: 18, anterior view, 19, dorsal view, 20, posterior view, 21, lateral view. 22–24, head, male: 22, anterior view, 23, dorsal view, 24, posterior view. 25–26, antenna: 25, sexual female, 26, male. 27, forewing, part, sexual female.

FIGURES 28–35. Dryocosmus juliae, new species. 28–34, sexual female: 28, mesosoma, lateral view, 29, mesoscutum, dorsal view, 30, mesoscutellum, dorsal view, 31, metascutellum and propodeum, posterodorsal view, 32–34, metasoma: 32, general lateral view, 33, part, lateral view, 34, part, ventral view. 35, male, metasoma, lateral view.