Hydrometra

Jehamalar, E. Eyarin & Chandra, Kailash, 2014, On the genus Hydrometra Latreille (Hemiptera: Heteroptera: Hydrometridae) from India with description of two new species, Zootaxa 3779 (5), pp. 501-517 : 502

Key to the species of Hydrometra from India

1. Abdominal tergum 8 rectangluar; sternites 7 or both 7 and 8 with setal tuft, setal patch, protuberance, thorn-like structure, dispersed long hairs (males)................................................................................ 2

- Abdominal tergum 8 sub-triangluar; sternites 7 or both 7 and 8 without any specialized characters like setal tuft, setal patch, protuberance, thorn-like structure or dispersed long hairs (females).............................................. 6

2. Males. Anteclypeus broad with anterior margin slightly concave medially, maxillary plate extending in front of anteclypeus ( Fig. 2D ), body dark brown to black colour. 7th sternite with a pair of setal patches near posterior region and 8th abdominal sternite with a pair of setal tuft near anterior region ( Figs. 4C , 5C )............................. H. cherukolensis sp. nov.

- Anteclypeus conical, body yellow to dark brown colour....................................................... 3

3. Seventh abdominal sternite with a pair of thorn-like processes, caudal process short ( Fig. 6 C-E)....... H. okinawana Drake

- Seventh abdominal sternite without thorn-like processes, but with dispersed setae or patch of setae; caudal process long.... 4

4. Seventh abdominal sternite not swollen but with transverse depression medially; sternites 6 and 7 with dispersed long setae, pronounced in segment 7 ( Fig. 4E , 5E )...................................................... H. greeni Kirkaldy

- Seventh abdominal sternite swollen, with a pair of setal patches ( Figs. 4A,G ; 5A,G)................................. 5

5. Lateral margin of setal patch on seventh abdominal sternite lined with long curved hairs; posterior part of sixth sternite and the whole seventh abdominal sternite with dispersed setae ( Figs. 4G , 5G )......................... H. nicobarensis sp. nov.

- Sixth and seventh abdominal sternites without dispersed setae, seventh abdominal sternite with a pair of small round patch of short setae and a row of little longer setae adjacent to setal patch continued postero-laterally ( Figs. 4A , 5A )......................................................................................... H. butleri Hungerford and Evans

6. Females. Anteclypeus broad with anterior margin concave medially; posterior region of sternite 7 triangularly produced, partly covering gonocoxae medially, without any characteristic hairs; caudal process is straight caudad, ( Figs. 3D , 4D , 5D )........................................................................................ H. cherukolensis sp. nov.

- Anteclypeus conical, posterior region of sternite 7 clothed with dense short procumbent hairs; caudal process straight caudad, ventrocaudad, slightly dorsocaudad....................................................................... 7

7. Subapex of sternite 7 with a shallow, half-circle depression; caudal process is slightly dorsocaudad, anterior margin in lateral view convexed ( Figs. 4H , 5H )........................................................ H. nicobarensis sp. nov.

- Subapex of sternite 7 without any depression; caudal process is straight caudad, ventrocaudad......................... 8

8. Caudal process is ventrocaudad, posterior region of tergite 7 raised, margin bordered with short hairs ( Figs. 3F , 4F , 5F )........................................................................................... H. greeni Kirkaldy

- Caudal process is straight caudad......................................................................... 9

9. Caudal process stout, with fringe of hairs ( Figs. 3B , 4B , 5B )......................... H. butleri Hungerford and Evans

- Caudal process slender, without characteristic fringe of hairs................................... H. okinawana Drake

Figures

FIGURES 2 A – H. Hydrometra spp. head tip: A, H. butleri female, lateral view; B, same, male, dorsal view; C, H. cherukolensis sp. nov. female, lateral view; D, same, male, dorsal view; E, H. greeni female, lateral view; F, same, female, dorsal view; G, H. nicobarensis female, lateral view; H, same, male, dorsal view.

FIGURES 4 A – H. Hydrometra spp. genital segments, ventral view: A, H. butleri male; B, same, female; C, H. cherukolensis sp. nov. male; D, same, female; E, H. greeni male; F, same, female; G, H. nicobarensis male; H, same, female.

FIGURES 5 A – H. Hydrometra spp. genital segments, lateral view: A, H. butleri male; B, same, female; C, H. cherukolensis sp. nov. male; D, same, female; E, H. greeni male; F, same, female; G, H. nicobarensis male; H, same, female.

FIGURES 6 A – E. Hydrometra okinawana, male: A, micropterous male, habitus, dorsal view; B, tip of head, dorsal view; C, genital segments, dorsal view; D, same, lateral view; E, same, ventral view.

FIGURES 3 A – H. Hydrometra spp. genital segments, dorsal view: A, H. butleri male; B, same, female; C, H. cherukolensis sp. nov. male; D, same, female; E, H. greeni male; F, same, female; G, H. nicobarensis male; H, same, female.