54 
Psyche 
[June 
tion of the vertex were separated as a further tribe (Peg- 
giogini). These tribal characters are not rigorous in 
their application, but intergrade with those found in the 
Tambiniini both in West Indian and Australasian genera. 
The development of a costal area, for example, may 
vary within a single genus. The South American Rotu- 
nosa indicanda (Wlk.) has a narrow costal area with 
distinct transverse veinlets in the distal part of the cor- 
ium; nearer the base the costal area narrows and these 
veinlets progressively merge into the membrane, where 
they are visible only as faint striae, and finally dis- 
appear. In Rotunosa grandis (Fenn.) the costal vein is 
slightly submarginal and devoid of transverse veinlets, 
though towards the node faint transverse striae can be de- 
tected. This condition can be matched elsewhere in tam- 
hiniine Tropiduchidae. As far as American genera are 
concerned the writer proposes to regard all in which the 
antennae are short, with the second joint subglobose, the 
mesonotum less than 1.5 times as broad as long with the 
lateral discal carinae parallel in their basal half, the 
tegmina thin and subhyaline, with a line of transverse 
veins between the node and apex of the clavus as belong- 
ing to a single subfamily. This group appears to be 
naturally related to the Old World Tropiduchus. 
A key to the new world genera, based on this view, is 
git^en below, being modified from the writer’s earlier key 
to Tambiniini ( sensu Melichar). 
Key to New World Genera of Tropiduchint 
(1) (2) Tegmina with a distinct costal area, subequal 
in width to costal cell, traversed by veinlets 
to margin for most of length (3) 
(2) (1) Tegmina with costal vein marginal, or very 
narrowly separated, no veinlets to margin along 
most of length (11) 
(3) (4) Vertex twice as long as broad or nearly so 
Pseudotangia Metcalf 
(4) (3) Vertex relatively shorter (5) 
(5) (6) Vertex as long as broad or slightly longer than 
broad (7) 
(6) (5) Vertex broader than long (9) 
