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VOL. XXV AUGUST, 1918 No. 4 
SYNOPTIC KEYS TO THE LYGHIDZ (HEMIPTERA) 
OF THE UNITED STATES. 
By H. G. Barser, 
Roselle Park, New Jersey. 
PART Il. RHYPAROCHROMIN~. 
As indicated by Stal the most important character for differ- 
entiating this subfamily is the peculiarity of the incisure between 
the third and fourth ventral abdominal segments which laterally 
curves forward and does not reach the lateral margin of the ab- 
domen. Plinthisus is about the only exception to this among 
United States genera. The presence of two sete, set close to each 
eye, is also characteristic of the group. Stal (Ofv. Vet.-Akad. 
Forh 1872) first divided this subfamily into six divisions: My- 
odocharia, Rhyparochromaria, Beosaria, Gonianotaria, Leth- 
aria, and Drymaria. Two years later (Stal, Enum. Hemipt. 
Pt. 4, 1874), in constructing a synopsis to include extra-Euro- 
pean genera, Stal added Cleradaria, combined Drymaria with 
Lethzaria and omitted all mention of the Gonianotaria. Accept- 
ing Stal’s arrangement this subfamily is therefore composed of six 
main divisions which Mr. Van Duzee has recently termed tribes 
to bring them more into accord with modern system of nomen- 
clature. In separating certain of his divisions Stal relied prin- 
cipally upon two characters—the position of the two opaque spots 
of the fourth ventral abdominal segment in reference to each other 
and the character of the lateral margin of the pronotum. Owing 
to the difficulty of interpreting these characters exactly in every 
case or owing to their variability the accuracy of StAl’s divisional 
arrangement has been called in question by several Hemipterists. 
Distant (Biol. Cent. Amer., p. 212, 1882) recognizes Myodocharia 
and combines all of the other divisions under Rhyparochromaria, 
stating that “I have here failed to interpret his [St4l’s] meaning 
sufficiently to prevent confusion.” Bergroth (Ann. Soc. Entomol. 
