On the taxonomy of chigger mites (Acariformes: Trombiculidae) parasitizing birds in Thailand and Malaysia, with the description of a new species Author K, Sirikamon Koosakulnirand Author RajasegaranK, Praveena Tropical Infectious Diseases Research and Education Centre, Universiti Malaya, Kuala Lumpur, & Institute for Advanced Studies, Universiti Malaya, Kuala Lumpur, Malaysia. Author Alkathiry K, Hadil A. Author ChaisiriK, Kittipong Department of Helminthology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand. Author RoundK, Philip D. Department of Biology, Faculty of Science, Mahidol University, Bangkok, Thailand. Author Eiamampai, Krairat Department of National Park Wildlife and Plant Conservation, Ministry of Natural Resources and Author Ahmad KhusainiK, Mohd K. S. Wildlife Conservation Division, Department of Wildlife and National Parks Peninsular Malaysia, Author RamjiK, Mohamad Fizl Sidq Faculty of Resources Science and Technology, University Malaysia Sarawak, Kota Samarahan, Sarawak, Author AbubakarK, Sazaly Tropical Infectious Diseases Research and Education Centre, Universiti Malaya, Kuala Lumpur, Author Ya’cobK, Zubaidah Tropical Infectious Diseases Research and Education Centre, Universiti Malaya, Kuala Lumpur, Author Stekolnikov K, Alexandr A. Laboratory of Parasitic Arthropods, Zoological Institute of the Russian Academy of Sciences, Saint Author Makepeace K, Benjamin L. Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, UK. text Acarologia 2023 2023-11-06 63 4 1109 1138 http://dx.doi.org/10.24349/yt89-g1ei journal article 10.24349/yt89-g1ei 2107-7207 10785781 Toritrombicula kirhocephales Goff, 1982 ( Fig. 5A ) Diagnosis — SIF = 7B-N-3-2111.0000; fPp = B/B/NNN; fCx = 1.1.1; fSt = 2.2; PL> AL> AM; fD = 2H-10(11)-8(10)-(6 – 8)-4-2; DS = 32 – 37; V = 26 – 34; NDV = 58 – 68; Ip = 1026 – 1246; eyes 2 + 2, of moderate size; flagelliform sensilla (trichobothria) with short branches in distal part; sensillary bases anterior to level of PL. Standard measurements are given in Table 5 . Distribution and hosts — This species was described ex Pitohui kirhocephalus (R.P. Lesson & Garnot) ( Passeriformes : Oriolidae ) from Papua New Guinea ( East Sepik province ). Here it is for the first time recorded in Asia ( Thailand ) and on all hosts mentioned below. Material examined — Six larvae ( ZIN 18004 – 18009) ex one Larvivora cyane (1), two Pachycephala cinerea (2), one Pycnonotus conradi (1), and one Phylloscopus tenellipes (2), THAILAND , Rayong province , Koh Mun Nai, 12.612384°N , 101.687574°E , 9 – 11 March 2021 , coll. S. Koosakulnirand; one larva ( ZIN 18010) ex L. cyane , THAILAND , Kanchanaburi province , W Mahidol University Campus, 14.13111°N , 99.14863°E , 10 December 2021 , coll. S. Koosakulnirand; two larvae ( ZIN 18011, 18012) ex Ficedula albicilla and Pycnonotus conradi , THAILAND , Kanchanaburi province , 5 km NW Mahidol University Campus, 14.15452°N , 99.12069°E , 13 December 2021 , coll. S. Koosakulnirand. 19 larvae (UoL) from same localities, same and additional host individuals of the same species plus one larva (UoL) ex Cyornis tickelliae , THAILAND , Kanchanaburi province , W Mahidol University Campus, 14.13111°N , 99.14863°E , 10 December 2021 , coll. S. Koosakulnirand; one larva (UoL) ex Pycnonotus aurigaster , THAILAND , Kanchanaburi province , 5 km NW Mahidol University Campus, 14.15452°N , 99.12069°E , 13 December 2021, coll. S. Koosakulnirand. Remarks — Our specimens deviate from the original description (Goff 1982) in more numerous idiosomal setae (fD = 2H-10(11)-8(10)-8(7)-4-2 vs. 2H-10-8-6-4-2, DS = 34 – 37 vs. 32, V = 31 – 34 vs. 26, NDV = 65 – 68 vs. 58) and slightly longer legs (Ip = 1145 – 1246 vs. 1026 – 1045, TaIIIL = 112 – 121 vs. 98). We estimate this difference as a case of intraspecific variation. Toritrombicula kirhocephales differs from T. densipiliata in exhibiting fewer idiosomal setae (two humeral setae vs. four; 1 st posthumeral row simple vs. double; DS = 34 – 37 vs. 50 – 65; NDV = 58 – 65 vs. about 104) (Goff 1982; Nadchatram 1967b ; Vercammen-Grandjean & Langston 1976 ).