1926 ] 
Some N otonecta from South America 
13 
Color : General view shows head, prothorax and legs yellow- 
ish. Scutellum and two circles on hemelytra black. Closer 
inspection reveals posterior half of pronotum darkened by black 
thorax beneath, an elongate yellow spot on lateral margins of 
scutellum. Hemelytra yellowish- white covered with silvery hairs 
and with the following typical maculations: Submarginal band 
of black on base of corium; distal end of clavus black; 
base of corium; distal end of clavus black; broad transverse 
black band traversing distal third of corium and base of membrane 
and embracing a small orange-yellow spot at end of embolium 
and entirely surrounding a much larger nearly circular spot 
above. The general effect produced is that of two black circles 
surrounding orange-yellow spots upon the insects, the lateral 
orange yellow spots upon the margins of the wings and opening 
upon the embolial sutures being unnoticed. 
Structural characteristics : The eyes farther apart at syn- 
thlipsis than in others of this group of species. Vertex: synthlip- 
sis : : 10 : 4. Anterior width of pronotum : posterior width of 
pronotum : : 23 : 33. The genital capsule of the male is shown 
on Plate II, Figure 1. 
Described from 50 specimens from Chile. Taken by Doctor 
Alfredo Faz. 15 of them from Santiago and the others from 
Termas Cauquenes. Holotype, allotype and some paratypes in 
author’s collection. Others in United States National Museum. 
Notonecta disturbata sp. nov. 
Size : Length, 8 mm.; width, 2.9 mm. 
Color : Of two color phases. One yellowish- white throughout. 
The other with yellowish-white head, anterior half of pronotum 
and legs; basal half of hemelytra and tip of membrane white; 
scutellum and remainder of hemelytra black. 
Structure : The eyes fairly close at synthlipsis. Vertex: 
synthlipsis : : 10 : 2.3. The width of the eye at base less than 
width of vertex. Sides of pronotum convergent. Anterior 
width of pronotum: posterior width of pronotum : : 19 : 29. 
The genital capsule of the male is shown Plate II, Figure 2. 
