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Stems of media and subcosta in hind wings more or less divergent basally 
and remote; base of radial sector persistent as a distinct free recurved 
spur (hamus). 
Tarsi 3-segmented; frena wanting; stem of media widely separated through- 
out from that of subcosta; apical part of media rarely with veinlike 
extension from the angle toward base of wing............ SCUTELLERIN AE. 
Tarsi 2-segmented; frena very short; stem of media nearing that of sub- 
costa beyond middle (Calif., Trop. Am.)................... CYRTOCORINAE. 
Stems of media and subcosta subparallel, approximate; hamus wanting; no 
indication of frena; opaque part of corium narrow, triangular, the apical 
MATL VST I: OWL beci3) accel etoays be le aw ghee aise he laled ia detalii GRAPHOSOMATINAE, 
Scutellum subtriangular, rarely approaching tip of abdomen or somewhat 
U-shaped; frena at least 1/4 as long as scutellum; opaque part of corium 
broad and subtriangular. 
Juga laterally toothed near apex *; basal part of stems of media and subcosta 
slightly divergent and separated, hamus distinct but short...... HALYDINAE. 
Juga not laterally toothed. 
Spiracle of first. visible ventral (really the second) exposed, a short but 
evident distance away from the metasternal margin; bucculae subparallel 
or slightly converging behind, first rostral contained in the groove or 
partly free and projecting at an angle; stem of media either contiguous 
to subecosta without trace of hamus, or divergent and somewhat distant 
from it with well-developed hamus (Mex. to S. Am., Cuba, Asia, Africa, 
PY h (Otc DEE) Mev Ol eet elarcinty Om ARP ENR ale onc rel is ohuneyoaaig eats Beans TESSARATOMINAE, 
Spiracle of first visible ventral covered, rarely exposed just at the meta- 
sternal margin; stems of media and subcosta contiguous and parallel, 
with very little or no trace of hamus. 
Bucculae subparallel, not united posteriorly, the first rostral not free, 
occupying the groove between them, at least in its posterior part. 
[Thorax with a longitudinal central ridge on ventral surface between 
the coxae on entire length; abdomen almost keeled ventrally on its 
entire length, with a long sharp curved process projecting forward 
between hind coxae; prothorax produced on venter anteriorly in form 
of a plate as in Scutellerinae, the inner margins of plates reflexed, 
forming a ridge on each side of median line; tarsi 2-jointed......... 
BRT OR te ei OR Ee ig. A eee ERO Cao an Dae ACANTHOSOMINAE. ] 
[Thorax and abdomen normal, without ventral keel or ridge; or if 
keeled the tarsi are 3-jointed; prothorax produced: anteriorly as 
above in Neottiglossa and Aelia only; caecal pockets present; tarsi 
S=JOMBS A Moc ese at erate eusescw. seston ae eeaiiera Shae ete sic Gear e rate etaneae t PENTATOMINAE. J 
Bucculae convergent and united behind, the first rostral thick, free, 
directed away from the head, only its base being between the bucculae; 
CACCALGPNCKELS AADSOU Gere az.c tee teue kr aieieee be eoitenay one cat ra enero tete ada re Uettentay eee ASOPINAE. 
* This should not be confused with the tooth of the side of the head at the base 
of the antennae. 
