Zalea sp. 1

McAlpine, D. K., 2007, The Surge Flies (Diptera: Canacidae: Zaleinae) of Australasia and Notes on Tethinid-Canacid Morphology and Relationships, Records of the Australian Museum 59 (1), pp. 27-64 : 55

Zalea sp. 1

Figs 21, 68–70

Material examined. 1!, New Zealand: Otanerito Bay [north side of beach, on shoreline rocks], near Akaroa, South Island , 1.ii.2001, B.J. D., D.K.M. ( AM). Otanerito Bay is also known as Long Bay, but there is another Long Bay, also on Banks Peninsula .

Description (!, male unknown). The only known specimen resembles Z. wisei in many characters but is larger and more elongate.

Coloration. Head grey-black to brown-black. Antenna dark grey to brown black. Prelabrum blackish, with grey pruinescence; palpus brownish, with grey pruinescence. Halter tawny, with creamy capitellum. Abdomen brown- black; paired sclerites of tergite 7 shining black, grey-brownpruinescent on short posterior section.

Head much higher than long; eye, in profile, subcircular, but for slight ventral extension, 1.1 times as high as long; triangle formed by joining centres of ocelli broader than equilateral triangle; cheek most prominent posteroventrally, height of cheek 0.25 of height of eye; postvertical bristles rather long, c. as long as anterior fronto-orbital, perhaps nearly parallel (one slightly displaced); ocellar bristles more closely placed than in other species. Palpus moderately short and thick, not extending anteriorly beyond prelabrum when proboscis withdrawn.

Thorax. Prosternum without precoxal bridge; anterior dorsocentral and proepisternal bristles longer than in other species. Wing: cell-4 index = 0.35.

Abdomen. Sternites 1 to 5 all broad and well sclerotized, undivided; tergite 7 rather like that of Z. dayi , medially divided to c. as far forward as fork of anterior apodeme (which is not exposed to view), each of paired sclerites somewhat elongate, rounded posteriorly, with several long setulae.

Dimensions. Total length (abdomen extended) 3.0 mm; length of thorax 1.2 mm; length of wing 2.9 mm.

Distribution. New Zealand: only known from Banks Peninsula, South Island.

Notes

Because of the similarity between this species and Z. wisei and the paucity of material, which prevents comparison between the same sex of each species, I refrain from naming this species at present. The extent of the differences between the samples seems to indicate specific distinction, but I have had to use subjective judgement in providing key characters. The single specimen of species 1 differs in having the eye in profile 1.12 times as high as long (1.25–1.27 in Z. wisei ), triangle formed by joining centres of ocelli broader than equilateral triangle (not broader than such in Z. wisei ), postfrons not much narrowed anteriorly, so that minimum separation of eyes = 0.40 of width of head (postfrons more narrowed anteriorly, so that minimum separation of eyes =

base of arista, scale (for Figs 70, 71 only) = 0.05 mm. 0.36 of width of head in Z. wisei ), cheek region, in outline, descending and most prominent posteriorly (cheek region not more ventrally prominent posteriorly than anteriorly in Z. wisei ), postvertical bristles at most slightly divergent (strongly divergent in Z. wisei ), ocellar bristles markedly closer together than are posterior ocelli (very slightly closer together than are posterior ocelli in Z. wisei ), antennal segment 3 blackish, brown on small part of ventral margin only (antennal segment 3 brown to tawny-brown above, tawny-yellow below in Z. wisei ), antennal segment 5 2.2 times as long as wide (3.6 times as long as wide in Z. wisei ), palpus brownish, not projecting anteriorly beyond prelabrum when proboscis withdrawn (palpus deep yellow, projecting distinctly beyond prelabrum in Z. wisei ), cell-4 index = 0.35 (0.39–0.43 in Z. wisei ).