THE ENITHARES (Hemiptera-Heteroptera: Notonectidae) OF THE ...

364 Pacific Insects Vol. 10, no. 2
13(12). Head length less than anterior width of vertex 14
Head length greater than anterior width of vertex 22
14(13). Metaxyphus with apex rounded buhleri Brooks
Metaxyphus with apex acuminate 15
15(14). Less than 10 mm long 16
10 mm or more long 18
16(15). Head width more than 3X median length atra Brooks & thienemanni Lundblad
Head width less than 3X median length 17
17(16). Not more than 9 mm long amboinensis n. sp.
Over 9 mm long fusca Brooks & ripleyana n. sp.
18 (15). Metaxyphus centrally depressed, lateral margins raised and thickened, infuscated
dark brown to black (fig. 60 &61) simplex (Kirby)
Metaxyphus not as above 19
19(18). Synthlipsis 2/3 anterior width of vertex subparallel n. sp.
Synthlipsis about 1/2 anterior width of vertex 20
20(19). Clavus and corium metallic greenish bronze metallica Brooks
Clavus and corium not metallic 21
21(20). Not more than 10.25 mm long atra Brooks
At least 11.5 mm long stylata n. sp.
22(13). Over 12 mm long horvathi Kirkaldy
Less than 12 mm long 23
23 (22). Lateral margins of 1st 2 visible ventral abdominal segments with a series of transverse
ridges (fig. 147) nigra n. sp.
Lateral margins of 1st 2 visible ventral abdominal segments not as above 24
24 (23). Lateral margins of pronotal fovea almost contiguous with posterior margin of eyes
(fig. 306) foveatus n. sp.
Lateral margins of pronotal fovea not as above 25
25(24). Head shorter than pronotum 26
Head longer than pronotum 32
26(25). Viewed laterally, margins of pronotum carinate gibbera Brooks
Viewed laterally, margins of pronotum rounded 27
27(26). Head width more than 3X median length thienemanni Lundblad
Head width less than 3X median length 28
28(27). At least 10 mm long 29
Not more than 9.75 mm long 30
29(28). Clavus and corium metallic greenish bronze metallica Brooks
Clavus and corium not metallic freyi quadrispinosus Lansbury
30 (28). Viewed laterally, lower margin of pronotal fovea raised, appearing as a projection
when viewed from above (fig. 320) martini Kirkaldy
Viewed laterally, lower margin of pronotal fovea rounded, not appearing as a projection
when viewed from above 31
31(30). Not more than 8.5 mm long intricata Breddin
Between 9-9.75 mm long ripleyana n. sp.
32(25). More than 10 mm long simplex (Kirby)
Less than 9.75 mm long 33
33(32). Tomentose area of pronotal fovea hardly visible when viewed from above 34
Tomentose area of pronotal fovea clearly visible from above 35
34 (33). Not more than 7 mm long megalops n. sp.
About 8 mm long paramegalops n. sp.
35(33). Lateral margins of metaxyphus convergent from base 36