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

360 Pacific Insects Vol. 10, no. 2
6 (5). Base of labrum with nodule-like projections on posterior corners (fig. 55)
simplex (Kirby)
Base of labrum not as above 7
7(6). Head width less than or only 2x median head length 8
Head width over 2>< median head length 13
8 (7). Outer claw of mid-leg conspicuously thickened and bent inwards 9
Outer claw of mid-leg not as above ll
9(8). Hind femur with a large spur ventrad (fig. 66) Sinica (Stal)
Hind femur not as above 10
10(9). Lateral margins of metaxyphus convergent (fig. 75) mandalayensis Distant
Lateral margins of metaxyphus more or less parallel (fig. 82) uncata Lundblad
11 (8). Nodal furrow less than its own length removed from membranal suture
hebridiensis n. sp.
Nodal furrow more than its own length removed from membranal suture 12
12 (ll). Anterior lobe with 2 dorsal projections, posterior lobe higher than anterior lobe
(fig. 93) bakeri Brooks
Dorsal margin of anterior lobe slightly convex distally, posterior lobe about as high
as anterior lobe (fig. 99) genitalis Lundblad
13(7). Head equaling or clearly longer than median pronotal length 14
Head clearly shorter than median pronotal length 31
14(13). Hind femur with a large spur ventrad (fig. 66) Sinica (Stal)
Hind femur not as above 15
15(14). Mid-femoral hairs very long, mesotrochanter spur-like at inner ventral angle 16
Mid-femoral hairs not very long, mesotrochanter not spur-like at inner ventral
angle 17
16(15). Outer lobe of mid-tibia distally rounded (fig. 104) alexis alexis Lansbury
Outer lobe of mid-tibia distally acuminate (fig. 110) alexis lairdi n. subsp.
17(15). Outer claw of mid-leg conspicuously thickened and bent inwards (fig. 70); hind
femur slightly expanded distally (fig. 72) mandalayensis Distant
Outer claw of mid-leg and hind femur not as above 18
18(17). Nodal furrow more than its own length removed from membranal suture 19
Nodal furrow equal to or less than its own length removed from membranal suture ... 22
19(18). More than ll mm long; lateral margins of 1st 3 and part of 4th visible ventral Connexival
segments minutely transversely ridged chinensis Brooks
Not more than 9.6 mm long; ventral Connexival segments not as above 20
20(19). Over 9mm long; lateral margins of metaxyphus concave (fig. 132.) Dorsal margin
of pronotal fovea directed caudad behind eyes (fig. 134) timorensis Brooks
Not more than 8 mm long; lateral margins of metaxyphus straight or convex. Dorsal
margin of pronotal fovea directed laterad from behind eyes 21
21 (20). Pronotum with a transverse rugose band interrupted medianly (fig. 139). Posterior
lobe finger-like (fig. 137) loria Brooks
Pronotum smooth. Posterior lobe not finger-like (fig. 99) genitalis Lundblad
22(18). 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 23
23 (22). Dorsal margin of pronotal fovea curving laterad from behind eyes (fig. 149)
bergrothi Montandon
Dorsal margin of pronotal fovea directed caudad from behind eyes 24
24(23). Head width slightly greater than 3X anterior width of vertex. Chaetotaxy of midtibia
interrupted distally (fig. 322) rogersi Distant