The ischnoceran chewing lice (Phthiraptera: Ischnocera) of bulbuls (Aves: Passeriformes: Pycnonotidae), with descriptions of 18 new species Author Gustafsson, Daniel R. 8D918E7D-07D5-49F4-A8D2-85682F00200C Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou, China. Department of Veterinary Sciences, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences, Kamycka 129, 165 00 Prague 6, Czech Republic. School of Biological Sciences, University of Utah, 257 S. 1400 E., Salt Lake City, Utah, 84112, USA. kotatsu@fripost.org Author Najer, Tomas 08A25BDD-8CCD-4709-9A57-7CE235D473C7 najer@af.czu.cz,tomas.najer@gmail.com Author Zou, Fasheng 9D1BB50D-CD19-4332-8854-4D0EA411342C Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou, China. Department of Veterinary Sciences, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences, Kamycka 129, 165 00 Prague 6, Czech Republic. School of Biological Sciences, University of Utah, 257 S. 1400 E., Salt Lake City, Utah, 84112, USA. zoufs@giz.gd.cn Author Bush, Sarah E. 87DAE296-C04F-4DA5-82A9-AC2715A065F8 dovelouse@gmail.com text European Journal of Taxonomy 2022 2022-03-09 800 1 88 http://dx.doi.org/10.5852/ejt.2022.800.1683 journal article 55869 10.5852/ejt.2022.800.1683 b4506300-8a4a-45f0-bc34-ec2eb31dfc92 2118-9773 6358666 213B577F-867D-4ECD-AD2C-48ACA71801B5 Sturnidoecus acutifrons ( Uchida, 1949 ) Philopterus sturni var. acutifrons Uchida, 1949: 549 . Sturnidoecus acutifrons – Hopkins & Clay 1952: 344 . Type host Hypsipetes amaurotis ogawae Hartert, 1907 – brown-eared bulbul. Type locality Amami-Oshima, Kagoshima Prefecture , Japan . Remarks Philopterus acutifrons was based on a single female, which was never illustrated or described in detail. It was separated from Philopterus sturni [= Sturnidoecus sturni (Schrank, 1776)] based on differences in measurements, the shape of the frons, and the lack of setae on posterior corners of the prothorax. In Philopteroides , the pronotal setae are situated more medianly, which may be interpreted as an ‘absence’ of setae on the pronotum. Similarly, the frons of Philopteroides on bulbuls is generally narrower and more deeply emarginated than in Sturnidoecus sturni (cf. Fig. 108 with Gustafsson & Bush 2017 : fig. 379). However, as at least some of Uchida’s species appear to be described from stragglers or contaminations (see above), it is possible that his specimen of P. acutifrons is a straggler that could belong to any head louse ecomorph genus occurring in Japan . Without examining specimens it is impossible to know what genus this belongs to; the species is in need of redescription, and should presently be considered a species inquirenda. If the type specimen is lost, it may be best to consider this name a nomen dubium, as it cannot reliably be placed in any genus.