338 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 115 



Elytron oblong; discoidal area long, with all boundary veins dis- 

 tinctly raised, longitudinally depressed so as to appear sulcate, mostly 

 three areolae deep; costal area wide, varying from one to two complete 

 rows of areolae. Hypocostal lamina uniseriate. Metathoracic wings 

 obsolete. A brachypterous male from Pinehurst, Oreg., is here 

 designated as the allotype. 



Macropterous form.- — Known only from the type specimen. 

 Differs from the short-winged form in having pronotum more convex, 

 all carinae slightly less raised; paranotum narrow, biseriate. Elytra 

 with subcostal areas large and overlapping each other in resting 

 posture; costal area biseriate at base and apex, uniseriate at middle. 

 Metathoracic wings large, longer than the abdomen. Length 2.90 

 mm., width 1.20 mm. 



HoLOTYPE.— Macropterous 9, Bozeman, Montana, June 13, 1913, 

 in Drake collection (USNM). 



Distribution (pi. 2). — Montana (Bozeman), Oregon (Pinehurst), 

 and California (Sequoia National Forest). The brachypterous form 

 (both sexes) was taken in numbers breeding on mosses at Pinehurst, 

 Oreg., by Joe Schuh, 



Acalypta thomsonii Stal 



Plate 8 



Acalypta thomsonii Stai 1873, p. 122. — Banks 1910, p. 55. — Osborn and Drake 

 1916a, p. 220.— Heidemann 1917, p. 220, pi. 17, fig. 3 (fig. only).— Van Duzee 

 1916, p. 25; 1917, p. 211.— Parshley 1923, p. 699.— Blatchley 1926, p. 480, 

 fig. 110.— Drake 1926, p. 377, pi. 34, fig. d; 1928b, p. 4, fig. 2.— Kurd 1946, 

 p. 463.— Bailey 1951, p. 35.— Drake and Ruhoff 1959, p. 138. 



Orthostira thomsoni: Lethierry and Severin 1896, p. 7. 



Acalypta madelinae Torre-Bueno 1926, p. 117. 



Brachypterous form. — Obovate or ovate, testaceous to brownish 

 testaceous with appendages brown to fuscous; fourth antenna! seg- 

 ment black; body beneath flavous to dark brown or fuscous. 



Head brown, with frontal spines and antennal process testaceous; 

 bucculae closed in front. Antennal measurements: segment I, 0.18 

 mm. ; II, 0.10 mm. ; III, 0.53 mm. ; IV, 0.22 mm. Pronotum depressed, 

 tricarinate; lateral carinae low, much less raised than median carina, 

 divergent posteriorly, usually with one row of tiny areolae; median 

 carina distinctly raised anteriorly, with a short row of three or four 

 fairly large areolae in front, then posteriorly with areolae becoming 

 obsolete; paranotum wide, almost rectangular in outline, biseriate 

 or triseriate in front and biseriate at base, with anterolateral corner 

 angulate; hood obtusely produced in front. Hypocostal lamina 

 uniseriate. 



