Dryocosmus

Cerasa, Giuliano, Verde, Gabriella Lo, Caleca, Virgilio, Massa, Bruno, Nicholls, James A. & Melika, George, 2018, Description of Dryocosmus destefanii new species (Hymenoptera: Cynipidae: Cynipini) from Quercus suber L. in Italy, Zootaxa 4370 (5), pp. 535-548 : 537-538

Key to the Western Palaearctic Dryocosmus species

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

- Males.............................................................................................. 10

2 Mesoscutellum entirely smooth, glossy; at most a very narrow strip laterally and posteriorly along emarginated edges sculp- tured; disk of mesoscutellum always smooth, glossy.......................................................... 3

- Mesoscutellum entirely and uniformly coriaceous or rugose.................................................... 5

3 Scutellar foveae more or less distinct, separated by distinct median carina ( Fig. 16 )................................. 4

- Scutellar foveae absent, anteriorly only a transverse impression present ( Fig. 32 ).......................... D. tavakolii

4 Pedicel and scape 1.5–1.7 times broader than flagellomeres ( Fig. 15 ); all flagellomeres nearly of the same width; scutellar foveae subtriangular, separated by median carina wider and shorter, with diverging sides, this short median carina occupies 1/8 of mesoscutellum length ( Fig. 16 ).......................................................... D. destefanii n. sp.

- Pedicel and scape at least 2.2–2.5 times broader than flagellomeres; flagellomeres towards the apex broadened, F8–F12 at least 2.0 times as broad as preceding flagellomeres ( Fig. 30 ); scutellar foveae subquadrangular, separated by distinct narrow median carina with non diverging sides, this long median carina occupies 1/4 of mesoscutellum length ( Fig. 31 )...... D. caspiensis

5 Gena not or inconspicuously broadened behind eye, not visible in anterior view................................... 6

- Gena strongly broadened behind eye, easily visible in anterior view ( Fig. 33 ).................... D. cerriphilus , asexual

6 Entire body reddish brown to light yellowish brown......................................................... 7

- Entire body black or brownish black...................................................................... 8

7 Eye large, silvery, transfacial distance nearly equal to height of eye, body uniformly light brown to yellowish..... D. mikoi

- Eye small, black, transfacial distance longer than height of eye; head and mesosoma reddish brown, metasoma darker ( Fig. 34 )............................................................................................ D. jungalii

8 All metasomal tergites, except 2nd, with distinct uniform dense micropunctures; mesoscutellar disk reaching mesoscutum in the center, very narrow anterior scutellar depression present only on both sides of this attachment point ( Fig. 35 )................................................................................................... D. kuriphilus

- All metasomal tergites, including 2nd, without micropunctures; mesoscutellar disk never reaching mesoscutum; broad com- plete transverse anterior scutellar depression present across mesoscutellum....................................... 9

9 Mesoscutellum distinctly longer than broad, rugose to coriaceous, elongate, with nearly parallel sides, with narrow median carina reaching mesoscutum and dividing medially smooth glossy broad anterior scutellar depression; body usually black or dark brown.................................................................................... D. mayri

- Mesoscutellum as long as broad or only slightly longer than broad, dull rugose, without median carina, with rugose anterior

scutellar depression; body usually brown to reddish brown.................................... D. cerriphilus , sexual 10 Body entirely yellow, except dark brown or black head..................................................... 11

- Body black or dark brown............................................................................. 12

11 Mesoscutellum smooth, glossy, without sculpture; head black......................................... D. jungalii

- Mesoscutellum uniformly coriaceous, head brown...................................................... D. mikoi

12 Diameter of lateral ocellus more than distance between ocellus and margin of eye; mesopleuron uniformly smooth glossy or delicately alutaceous; mesoscutellar disk alutaceous or very delicately coriaceous............................ D. mayri

- Diameter of lateral ocellus less than distance between ocellus and margin of eye; mesopleuron smooth glossy, with delicate longitudinal striae in medioanterior part; mesoscutellar disk uniformly coriaceous to rugose............... D. cerriphilus

Figures

FIGURES 10–17. Dryocosmus destefanii new species, asexual female: 10, head (front view); 11, head (posterior view); 12, head (dorsal view); 13, head (lateral view); 14, Magnification of the lower face and malar space; 15, antenna; 16, mesoscutum and mesoscutellum (dorsal view); 17,mesosoma (lateral view).

FIGURES 28–33. 28–29, Chilaspis nitida, asexual female: 28, antenna, 29, head, front view; 30–31, Dryocosmus caspiensis, asexual female: 30, antenna, 31, mesosoma, dorsal view; 32, D. tavakolii, mesoscutellum, dorsal view; 33, D. cerriphilus, asexual female, head, anterior view.

FIGURES 34–37. 34, D. jungalii, female, head, anterior view; 35, D. kuriphilus, mesoscutellum, dorsal view; 36–37, Mesoscutellum, dorsal view: 36, D. mayri, 37, D.cerriphilus, sexual female.