PSYCHE VOL. XXV AUGUST, 1918 No. 4 SYNOPTIC KEYS TO THE LYG^EIDiE (HEMIPTERA) OF THE UNITED STATES. By H. G. Barber, Roselle Park, New Jersey. PART II. RHYPAROCHROMIN^E. 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 setse, 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-aearia, 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 Lethsearia 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 "T have here failed to interpret his [Stal's] meaning sufficiently to prevent confusion." Bergroth (Ann. Soc. Entomol.