Guithera, Distant, 1906

Chen, Zhuo, Li, Hu & Cai, Wanzhi, 2021, Proguithera caspersi, a new cavernicolous thread-legged bug species (Hemiptera Heteroptera: Reduviidae: Emesinae) from Hainan, China, Zootaxa 4963 (2), pp. 354-364 : 362-363

Key to species of the Guithera –Lutevula group

Modified from Rédei (2004) and Ishikawa & Naka (2016).

1 Fore tarsus not segmented.............................................................................. 2

- Fore tarsus two-segmented, tarsomere II very short.......................................................... 3

2 Body length (to apex of fore wings) about 8 mm; rather uniformly yellowish-brown, without conspicuous pattern elements; fore tarsus shorter than fore tibia; fore wing with Rs and cross vein connecting M+Cu to submarginal vein basad of discal cell present........................................................................ Lutevula hortensia (Distant)

- Body length (to apex of fore wings) about 5 mm or less; conspicuously bicolored; fore tarsus longer than fore tibia; fore wing with Rs and cross vein mentioned absent................................................ Guithera feana (Distant)

3 Median longitudinal sulcus on anterior pronotal lobe present; cross vein connecting M + Cu to submarginal vein basad of discal cell complete......................................................................................... 4

- Median longitudinal sulcus on anterior pronotal lobe absent; cross vein incomplete......... P. kiinugama Ishikawa & Naka

4 Body length (to apex of fore wings) about 11.5 mm; median longitudinal sulcus on anterior pronotal lobe shallow; anteroventral and posteroventral series of fore femur composed of about 40 and 65–70 spine-like setae, respectively... P. inexpectata Rédei

- Body length (to apex of fore wings) about 9 mm; median longitudinal sulcus on anterior pronotal lobe deep; fore femur with fewer spine-like setae.................................................................................. 5

5 Pronotum along midline 1.1 times as long as its width across humeral angles; anteroventral series of fore femur composed of about 25 spine-like setae; cross vein connecting M + Cu to submarginal vein basad of discal cell weakly developed; discal cell longer than vein extending from its apex..................................................... P. caspersi sp. nov.

- Pronotum along midline 0.9 times as long as its width across humeral angles; anteroventral series of fore femur composed of no more than 20 spine-like setae; cross vein connecting M + Cu to submarginal vein basad of discal cell well developed; discal cell shorter than vein extending from its apex.......................................... P. drescheri (Wygodzinsky)