Nico NIESER & Pingping CHEN Tiel, The Netherlands SIXTEEN NEW SPECIES OF NEPOMORPHA (HETEROPTERA) MAINLY FROM SULAWESI (INDONESIA) Notes on Malesian aquatic and semiaquatic bugs (Heteroptera), VIII Nieser, N. & P. P. Chen, 1999. Sixteen new species of Nepomorpha (Heteroptera) mainly trom Sulawesi (Indonesia). -Tijdschrift voor Entomologie 142: 77-123, figs. 1-135, tabels 1, 2. [ISSN 0040-7496]. Published 22 September 1999. Representatives from the Nepomorphan families Belostomatidae, Corixidae, Helotrephidae, Micronectidae, Notonectidae, Ochteridae and Pleidae, mainly trom Sulawesi, are discussed and, where appropriate, keys are provided. In addition, a table of species from Sulawesi and ad-jacent areas is provided and some comments on the biogeogtaphy of the infraorder in the area are given. The following new species are described: Micronectidae: Micronecta kymatista and Micronecta pachynychi from Sulawesi, Micronecta aleksanderi from Jawa, Micronecta skittalis from Sabah; Helotrephidae: Helotrephes otoeis from Sabah; Hydrotrephes makros and Hy-drotrephes mexon from Sulawesi, Hydrotrephes zetteli from Sangir Is., Hydrotrephes polhemi from Flores, Hydrotrephes pardalos and Hydrotrephes stereos from Mindanao; Notonectidae: Anisops rhomboïdes from Sulawesi, Mindanao and Brunei, Anisops salibabu from Sulawesi and Talaud Is.; Ochteridae: Ochterus homorfos and Ochterns trichota from Sulawesi, Ochterus pardalos from Mindanao. Correspondence: Dr. N. Nieser, Htg. Eduardstr. 16, 4001 RG, Tiel, NL. E-mail:
[email protected] Key words. -Nepomorpha, Anisops, Helotrephes, Hydrotrephes, Micronecta, Ochterus new species, keys; Indonesia, Sulawesi, Sangir I., Flores, Philippines, Mindanao, Malaysia, Sabah. For the time being, this paper completes our treat-ment of Sulawesi Nepomorpha. The set of papers Nieser & Chen (1991, 1996 and the present one) provides an identification guide to all Sulawesi Nepo-morpha species. There is little doubt, however, that a number of undescribed species are still to be discov-ered in Sulawesi for several families of Nepomorpha. Material and methods Measurements are in mm and are based on five specimens of each sex taken from the sample contain-ing the holotype (if available). They are represented as the range of the sample with the sample mean in ital-ics. Length and width tefer to the maximum value of the specified body part oriented horizontally; if not specified they refer to body length and maximal body width. Body length is measured from anterior margin of vertex to apex of hemielytra. Extremities are mea-sured with the ventral side upward, this is especially important in fore tibia of male Micronecta. The ocu-lar index is computed as two times the synthlipsis (S) divided by the difference between width of head (D) and synthlipsis, in formula: 2S/(D-S). This measure-ment buffers against peaks in the ratio synthlipsis/ width of eye, due to imperfect orientation of the head. Where necessary, other measurements will be discussed under the separate families. The areas in Sulawesi used in indication of the lo-calities are the administrative provinces. Some addi-tional data on the localities sampled by Nieser in 1989 (with numbers N89xx) can be found in Nieser & Chen (1991). Pulau Sangir is a spice island be-longing to Sulawesi Utara province. As it lies some 200 Km N. of the notthem point of 'mainland' Su-lawesi it is not on the map used in this paper (fig. 126). Remarks between braces {} after the locality data contain additional information not found on the labels. Abbteviations: brach. = brachyptetous, macr. = macropterous; lvIV, lvV = 4th and 5th instar larva re-spectively; L = length, W is width. Specimens have been deposited in the following 77
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