A key to species of genus Malcus Stål, with descriptions of four new species from China (Hemiptera: Heteroptera: Malcidae) Author Wang, Shujing Author Bu, Wenjun text Zootaxa 2020 2020-04-01 4759 1 31 48 journal article 10.11646/zootaxa.4759.1.2 9b5efe0b-1ca6-4468-b462-227be30ffd37 1175-5326 3735937 1C32D464-B30D-4F6E-9D1D-46C84C8316B6 Malcus gibbus Zheng, Zou & Hsiao, 1979 ( Figs. 2 , 24, 28 , 31 ) Malcus gibbus Zheng, Zou & Hsiao, 1979: 275 , 279. Malcus gibbus : Zheng (1999: 271) ; Kerzhner (2001: 227) . Male description: The externally visible characters of male were similar as female. Anterior part of 7 th ventrite of male sublaterally with protruding paired truncate processes ( Fig 31 ). Pygophore with 2 divergent parandria, stubby ( Figs. 24, 28 ). FIGURES 9–16. Malcus spp., pronotum dorsal and frontal views: 9 & 10, M. alatus sp. nov. ; 11 & 12, M. bacillus sp. nov. ; 13 & 14, M. planus sp. nov. ; 15 & 16, M. externus sp. nov. TABLE 1. Measurements (mm) of Malcus species (All measured data of each species integrated from two resources: one is measured in this study, represented by “ N ”, means number of specimens measured in this study; the other one comes from previous resources, represented by “ MPR ”)

Length of body	1st segment of antenna	2nd segment of antenna	3rd segment of antenna	4 th segment of antenna	Total length of antenna	Width of head including eyes	Maximum width of pronotum	Minimum width of combined hemelytra	N	MPR
M. alatus sp. nov.	4.60	0.57	1.03	1.66	0.61	3.87	0.90	2.29	1.22	1
M. bacillus sp. nov.	4.77	0.63–0.64	1.06–1.11	1.74	0.62	4.10	0.87–0.94	1.64–1.71	1.19–1.24	2
M. externus sp. nov.	3.72–4.04	0.53–0.58	0.94–0.99	1.51–1.67	0.51–0.60	3.54–3.71	0.72–0.78	1.15–1.23	0.84–0.92	3
M. planus sp. nov.	3.56–3.81	0.46–0.53	0.93–1.05	1.31–1.42	0.43–0.51	3.17–3.45	0.68–0.72	1.01–1.11	0.84–0.90	4
M. arcuatus	4.03–4.30	0.64–0.70	0.97–1.06	1.66–1.70	0.51–0.66	3.92–3.94	0.81–0.88	1.31–1.35	1.01–1.07	3	Zheng, Zou & Hsiao, 1979
M. ariculatus	4.38–4.52	0.62–0.67	1.01–1.07	1.71–1.79	0.59–0.67	4.12–4.14	0.80–0.84	1.38–1.44	1.05–1.10	3	Štys, 1967
M. dentatus	4.02–4.74	0.71–0.80	1.17–1.23	1.86–1.87	0.57–0.60	4.40–5.30	0.71–0.75	1.41–1.86	0.84–0.94	3	Štys, 1967
M. denticulatus	3.90–4.15	0.50–0.57	0.97–1.01	1.45–1.48	0.51–0.55	3.51–3.54	0.80–0.84	1.50–1.58	0.97–1.10	3	Zheng, Zou & Hsiao, 1979
M. elevatus	3.96–4.07	0.54–0.58	0.92–0.99	1.50–1.65	0.43–0.53	3.46–3.70	0.68–0.76	1.47–1.58	0.93–1.00	1	Zheng, Zou & Hsiao, 1979
M. elongatus	4.05–4.49	0.60–0.64	1.05–1.13	1.35–1.51	0.57–0.68	3.45–0.96	0.66–0.68	1.05–1.21	0.87–0.99	3	Štys, 1967
M. flavidipes	2.79–3.68	0.47–0.72	0.74–1.05	1.22–1.86	0.42–0.63	2.94–4.19	0.65–0.80	0.99–1.46	0.75–1.07	10	Štys, 1967
M. furcatus	4.29–4.65	0.59–0.63	0.96–1.14	1.44–1.68	0.56–0.63	3.62–4.02	0.78–0.81	1.26–1.44	0.99–1.14	8	Štys, 1967
M. gibbus	4.40–4.45	0.69–0.75	1.01–1.16	1.70–1.76	0.59–0.62	4.07–4.24	0.44–0.48	1.45–1.54	1.08–1.14	6	Zheng, Zou & Hsiao, 1979
M. idoneus	3.90–4.62	0.59–0.75	1.06–1.14	1.62–1.89	0.56–0.66	3.78–4.38	0.83–0.87	1.25–1.41	0.99–1.14	2	Štys, 1967
M. inconspicuus	3.12–3.46	0.63–0.84	0.81–0.93	1.32–1.53	0.47–0.50	3.23–3.56	0.74–0.78	1.17–1.28	0.92–0.96	2	Štys, 1967
M. indicus	3.60–3.84	0.54–0.65	0.84–1.02	1.28–1.53	0.45–0.51	3.11–3.71	0.72–0.75	1.23–1.34	0.90–0.96	2	Štys, 1967

......continued on the next page TABLE 1. (Continued)

Length of body	1st segment of antenna	2nd segment of antenna	3rd segment of antenna	4 th segment of antenna	Total length of antenna	Width of head including eyes	Maximum width of pronotum	Minimum width of combined hemelytra	N	MPR
M. insularis	3.27	0.56	0.77	1.35	0.50	3.15	0.72	1.11	0.86	0	Štys, 1967
M. japonicus	4.92–5.04	0.54–0.60	1.02–1.05	1.17–1.20	0.56–0.63	3.35–3.36	0.78–0.86	1.59–1.67	1.23–1.25	5	Štys, 1967
M. mishmi	4.26	0.60	0.93	1.46	–	–	0.81	1.35	1.01	0	Štys, 1967
M. nigrescens	4.41	0.72	1.05	1.47	0.59	3.86	0.84	1.34	1.02	0	Štys, 1967
M. nigrofasciate	4.17–4.70	0.66–0.69	1.01–1.16	1.56–1.69	0.60–0.67	3.49–3.83	0.75–0.83	1.37–1.53	1.04–1.26	0	Štys, 1967
M. noduliferus	4.50–4.75	0.70–0.75	0.90–0.96	1.63–1.72	0.53–0.59	3.88–4.12	0.81–0.83	1.45–1.56	1.06–1.14	3	Zheng, Zou & Hsiao, 1979
M. piceus	4.50–4.60	0.75–0.79	1.06–1.14	1.91 –1.94	0.62–0.68	4.56–4.58	0.84–0.94	1.51–1.60	1.12–1.19	2	Zheng, Zou & Hsiao, 1979
M. pallidus	3.51–3.81	0.54–0.59	1.21–1.23	1.38–1.53	0.54–0.59	3.41–3.63	0.69–0.77	1.11–1.23	0.84–0.92	0	Štys, 1967
M. setosus	3.42–4.10	0.68–0.75	0.99–1.19	1.29–1.65	0.41–0.49	3.41–4.06	0.69–0.81	1.05–1.23	0.80–0.97	3	Štys, 1967
M. similis	4.74	0.66	1.05	1.61	0.62	3.93	0.84	1.46	1.05	0	Štys, 1967
M. sinicus	3.36–3.50	0.53–0.57	0.62–0.69	1.23–1.41	0.44–0.50	2.97–3.15	0.72–0.77	1.16–1.28	0.90–0.98	10	Zheng, Zou & Hsiao, 1979
M. spinosus	4.36	0.83	1.31	–	–	–	0.76	1.86	1.03	0	Kondorosy, 2000
M. stysi	3.27–3.40	0.74–0.95	0.90–1.00	1.50–1.60	0.51–0.55	3.68–4.00	0.73–0.80	1.15–1.33	0.92–0.97	0	Kondorosy, 2000
M. subauriculatus	4.21–4.25	0.64–0.68	0.95–1.10	1.58–1.71	0.60–0.63	3.90–4.10	0.77–0.79	1.33–1.41	1.01–1.04	3	Zheng, Zou & Hsiao, 1979
M. thoracicus	4.50–5.19	0.59–0.62	1.10–1.32	1.55–1.89	0.54–0.57	3.77–4.37	0.80–0.87	1.86–2.10	1.10–1.27	1	Štys, 1967
M. tuberculatus	3.78–4.32	0.54–0.63	0.93–1.07	1.49–1.67	0.51–0.59	3.50–3.84	0.66–0.80	1.19–1.38	0.86–1.07	0	Štys, 1967
M. vasarhelyii	4. 68	0. 46	0. 97	1. 20	0. 60	3. 23	0. 80	1. 71	1. 26	0	Kondorosy, 2000

Remarks. This species closely resembles M. noduliferus , their head and pronotum without erect hairs and pronotum with significantly raised posterolateral tubercle. But M. noduliferus with distinct posteromedial tubercle, can easily be distinguished. Material examined. Holotype , ♀ , China : Yunnan : Near Simao City , alt: 950m , 17.v.1957 ; Paratype , ♀ , same data as the holotype . China : Yunnan : 2♂♂ 17♀♀ , Simao City , Laiyang River , Luoluoxinzhai Mountain , alt: 1500m , 21.v.2000 , Leyi Zheng & Wenjun Bu ; 3♂♂ 7♀♀ , Simao Ctiy , Laiyang River , Tianbi , alt: 1550m , 22.v.2000 , Leyi Zheng & Wenjun Bu ; 2♂♂ 5♀♀ , Simao City , Laiyang River , Tian Ba , alt: 1100m , 23.v.2000 , Wenjun Bu . Distribution. China ( Yunnan ).