Subtribe Valgina Mulsant, 1842 (Bouchard et al. 2011)

Checklist of Chinese Hybovalgus

Hybovalgus bioculatus Kolbe, 1904

calvus sp. nov.

fraternus Moser, 1915

= Excisivalgus csikii Endrödi, 1952

fulvosquamosus Moser, 1904

sexdentatus Arrow, 1944

jordansi (Endrödi, 1952)

thibetanus (Nonfried, 1891)

= versicolor Moser, 1908

= laticollis Arrow, 1944

= Valgus pubicollis Pic, 1928

= Valgus savioi (Pic, 1928)

= yunnanus Moser, 1906

tonkinensis Moser, 1904

= Excisivalgus klapperichi Endrödi, 1952

Key to males

1. Pronotal carinae present as rounded elevations or barely noticeable ................................................ 2

– Pronotal carinae sharp (sometimes only slightly sharp).....................................................................4

2. Pronotal posterior margin slightly protruding backwards, apex rounded ......................................... 3

– Pronotal posterior margin simply rounded ............................................... H. bioculatus Kolbe, 1904

3. Pronotal carinae parallel, barely noticeable or nearly obsolete, short or long (at most ⅓ pronotal length). Meso- and metatibiae each without central tooth on posterior sides ........ H. calvus sp. nov.

– Pronotal carinae arched outwardly, ending well after middle of disc. Meso- and metatibiae each with a prominent central tooth on posterior side ............................................ H. tonkinensis Moser, 1904

4. Protibia with 6 external teeth: teeth 1–3 long and sharp, teeth 4–6 short and slightly sharp ................ ................................................................................................................ H. sexdentatus Arrow, 1944

– Protibia with 5 external teeth: teeth 1–3 long and sharp, teeth 4–5 short and slightly sharp ............ 5

5. Posterior margin of pronotum simply rounded; pronotal lateral margin not arched toward inside on posterior half ..................................................................................................................................... 6

– Posterior margin of pronotum at center more or less prominent; pronotal lateral margins noticeably arched on posterior toward inside in the second half ........................................................................ 7

6. Pronotum suboval (Fig. 7A), lateral small carina obsolete. Anal sternites covered with recumbent, testaceous scales, sparse on disc and dense laterally ................................. H. fraternus Moser, 1915

– Pronotum subtrapezoidal (Fig. 9A), lateral small carina present, posteriorly arching outwards. Anal sternites completely covered with thick, recumbent, testaceous scales ............................................... ........................................................................................................... H. thibetanus (Nonfried, 1891)

7. Pronotal posterior margin at center slightly prominent, with apex rounded (Fig. 8K); pronotal lateral small carina obsolete ....................................................................... H. fulvosquamosus Moser, 1904

– Pronotal posterior margin at center prominent, V-shaped, apex rounded on top only (Fig. 8G); pronotal lateral small carina present, posteriorly arching outwards ....... H. jordansi (Endrödi, 1952)

Key to females (females of H. fulvosquamosus and H. jordansi are unknown)

1. Pronotal carinae present as rounded elevations or noticeable and short ........................................... 2

– Pronotal carinae sharp (sometimes only slightly sharp) .................................................................... 3

2. Pronotal posterior margin at center excavated in shape of an enlarged “E”. Metatibia without central tooth at center of posterior margin ........................................................... H. bioculatus Kolbe, 1904

– Pronotal posterior margin at center prominent, V-shaped. Metatibia with a barely noticeable tooth at center of posterior margin ....................................................................................... H. calvus sp. nov.

3. Protibia with 5 external teeth ............................................................................................................ 4

– Protibia with 6 external teeth ................................................................. H. sexdentatus Arrow, 1944

4. Pronotal posterior margin at center deeply excavated as an enlarged “E” (Fig. 11E) .................. .......................................................................................................... H. tonkinensis Moser, 1904

– Pronotal posterior margin at center slightly excavated as an enlarged “C” (Fig. 9G) ......... 5

5. Elytra near scutellum deeply depressed and with prominent ridges. Pygidium without cretaceous maculae ............................................................................................. H. thibetanus (Nonfried, 1891)

– Elytra near scutellum depressed but without ridges. Pygidium on sides covered with cretaceous maculae ...................................................................................................... H. fraternus Moser, 1915