332 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 115 



representative of the genus not known to occur in the Nearctic region. 

 None of the species is common to both the Old and New Worlds. 

 Fossil forms are unknown. 



Acalypta comprises a well-defined, homogenous group of species 

 with similar facies, especially the brachypterous forms (pis. 3-11, 13, 

 14). The macropterous form (pi. 12) is apparently rather uncommon 

 and only known for three of the American species. The differences in 

 habitus between the dimorphic forms of a species are depicted in the 

 illustrations of A. barberi (pis. 11, 12). The macropterous forms like- 

 wise are similar in general aspect to one another. 



The present paper is based largely upon the collections of the 

 authors, which include all the American species and most of the 

 European forms. The material in the U.S. National Museum, where 

 all the American species are represented, and in the private collection 

 of Mr. Joe Schuh, Kalamath Falls, Oreg., have also been studied. 

 We are indebted to Patricia J. Hogue, Arlington, Va., and Liza 

 Biganzoli, Washington, D.C., for the fine illustrations. The latter 

 also prepared the map (pi. 2) showing the distribution of Acalypta spp. 

 in the northwestern United States and bordering provinces of Canada. 

 This work is a byproduct of a tingid project being conducted with the 

 aid of a National Science Foundation grant. 



Genus Acalypta Westwood 



Acalypta Westwood 1840 (synopsis) p. 121.— StM 1873, pp. 118, 122; 1874, 

 p. 51.— Horvdth 1906, pp. 13, 24.— Oshanin 1908, p. 406; 1912, p. 42.— Banks 

 1910, p. 55.— Van Duzee 1916, p. 25; 1917, p. 211.— Osborn and Drake 1916a, 

 p. 220.— Parshley 1923, pp. 696, 698.— Blatcbley 1926, p. 480.— Drake 

 1928b, pp. 1-9.— China 1943, p. 245.— Hurd 1946, p. 462.— Bailey 1951, 

 p. 32.— Kiritshenko 1951, pp. 240, 244.— Drake and Ruhoflf 1959, p. 138; 

 1960, p. 31. 



Orthosteira Fieber 1844, p. 46. 



Monanthia (Orthosteira): Flor 1860, pp. 330, 331. 



Orthostira [sic]: Fieber 1861, p. 130. — Lethierry and Severin 1896, p. 6. 



Fenestrella Osborn and Drake 1916a, p. 222.— Parshley 1917a, p. 14. 



Drakella Bergroth 1922, p. 152.— Parshley 1923, pp. 696, 698.— Blatchley 1926, 

 p. 481. 



Type species: Tingis carinata Panzer. 



Brachypterous form. — Small, ovate, obovate, or oblong (pis. 3, 

 7, 8), pronotum subdepressed, elytra more or less convex, general 

 color brownish testaceous to blackish fuscous. Size small, ranging 

 from 1.65-2.70 mm. long. 



Head.— Short, only shghtly produced in front of eyes, usually 

 armed with one pair of stout, porrect, frontal spines, other spines 

 wanting; eyes large, granulate; bucculae foUaceous, areolate, open or 

 closed in front, extending backwards beneath anterior part of 

 prosternum; sternal laminae of rostral sulcus uniseriate, present on all 



