Dryocosmus

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