Bactrocera (Zeugodacus) incisa ( Walker, 1861 ) New Record

Chen, Xiaolin, Zhou, Libing, Wang, Shaojun, Li, Zhiwen & Li, Jie, 2011, A new species and record of Bactrocera Macquart (Diptera, Tephritidae) from China, Zootaxa 3014, pp. 59-64 : 60

Bactrocera (Zeugodacus) incisa ( Walker, 1861) New Record in China

Dacus incisus Walker, 1861 , Tran. Ent. Soc. Lon., (2)5: 323. Lectotype 3 in BMNH. Dacus (Strumeta) incisus Walke, 1861 . Hardy 1959: 175; Hardy 1973: 43.

Bactrocera (Zeugodacus) incisa ( Walker, 1861) . White & Hancock 1997.

Description. Male, length of body 5.3 mm; of wing 5.5 mm.

Head ( Figs 5–6 .). Frons yellow to fulvous, length about 1.3 times of width, 1.0 times as wide as eye. Lunule black. Ocellar triangle black and vertex yellow to fulvous. Face yellow to fulvous with black band. Parafacials and genae yellow to fulvous. Occiput dark-brown to black, yellowish along eye margin; occipital row absent. Antenna segments 1 yellow to fulvous and 2 yellow to fulvous with a narrow black longitude band, segment 3 fuscous with apex and anterior part slightly dark-brown and about 3.4 times as long as segment 2; arista bare, black, yellow basally. Head setae black: two pairs of frontals and one pair of orbitals; one pair of medial vertical, lateral vertical and genal setae.

Thorax. Scutum ( Fig 3 .) black with 2 narrow, long lateral postsutural yellow vittae extending to at level of intra-alar setae. Postpronotal lobes entirely yellow. Pleura predominantly black with following yellow areas: notopleural callus, anepisternal stripe, anatergite and katatergite. Scutellum yellow with a black basal band. Mediotergite entirely black. Thoracic chaetotaxy: 2 scutellar, 2 notopleural, 1 postsutural supra-alar, 1 postalar, 1 intra-alar, 1 anepisternal and 4 scapular setae, prescutellar acrostichal absent. Wing ( Fig 2 .) hyaline in ground color; costal brown band confluent with vein R2+3, not widened apically; anal streak extending to posterior margin; cells bc and c colorless. Legs fuscous to black; fore femora almost completely black, mid femora with basal 1/3 fulvous and remainder black, hind femora with basal 2/3 fulvous and remainder black; fore and mid tibiae fuscous, hind tibiae black; tarsi fuscous (apical 4 segments darker); mid tibiae each with an apical black spur.

Abdomen ( Fig 4 ). Oval in shape, general dark brown to black. Tergiters 1 black, with a narrow, yellow to fulvous band on posterior margin; tergiters 2 black, with a broad, yellow to fulvous band on posterior margin and concave at middle; tergite 3 and 4 almost entirely dark brown to black; tergite 5 yellow to fulvous, and slightly longer than tergite 4; pecten present on tergite 3. Hind margin of Sternite 5 shallow curved.

Male terminalia: Epandrium large and broad, rounded in posterior view ( Fig 7 ); posterior surstylus lobe much longer, lateral surstylus with apex angulated in lateral view ( Fig 8 ); medial surstylus with 2 black and similar size prensiseta. Glans slightly elongate, with slender and membranous subapical lobe.

Material examined. Lectotype, 13 ( BMNH), Burma: W.W. Saunders, April 1968 (examined through photograph); 1 3 ( IZCAS), China: Yunnan: Xishuangbanna Ganlanba 541.3m, 100º56’30’’, 21º51’7’’, 26–31 January 2008, Chen Xiaolin, attracted to Cue lure.

Distribution. India, Burma, Thailand, China (Yunnan).

Attractant. Cue lure.

Host. Unknown.

Remarks. This species seems a typical member of subgenus Bactrocera from most morphlogical characters, but it is really a species of subgenus Zeugodacus because of posterior surstylus lobe much longer and hind margin of ternite 5 shallow curved. It is similar to B (B.) lata (Perkins) in head, scutum and wing pattern, but differs from it in the mid femoral with basal 1/3 fulvous, abdomen with yellow to fulvous narrow band on posterior margin of tergiters 1 and broad yellow to fulvous band on posterior margin of tergiters 2. The examined specimen from Yunnan, China has some color variations on head comparing with the type specimen of B (Z.) incisa (Walker) , but generally fit it well in other regards.

Figures

FIGURES 1 – 8. Bactrocera (Zeugodacus) incisa (Walker, 1861). 1. Adult in lateral view; 2. Wing; 3. Scutum in dorsal view; 4. Abdomen in dorsal view; 5. Head in lateral view; 6. Head in frontal and lateral view; 7. Epandrium, circus and surstylus in posterior view; 8. Epandrium, circus and surstylus in lateral view