254 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



ventral plate of the male is acutely produced, being at least twice as 

 long as its greatest depth. The valves of the ovipositor are strongly 

 exerted, with the upper pair finely crenulate above. 



Mecostethus, Fieber, 1853. Syn., 10. 



Mecostethus, Bruner, 1S82. Pro. Eur. Orth., 94, fig. 24. 



Mecostethus, Bruner, 1893. Rev. Sys. Orth., 123. 



Mecostcthiis, Morse, 1896. Psyche, VII, 327, figs. i3-i5b. 



Stetheophyina, Fisch., 1853. Orth. Eur., 357, XVIII, fig. 3. 



Stefheophyma, Stal, 1873. Recen. Orth., I, 93. 



Stethcophyma, Thos., 1873. Syn. Acrid. N. Am., 98. 



Stetheophyina, Boliv., 1876. Syn. Acrid. Esp., 139. 



Stefheophyma, Thos., 1880. Nox. and Ben. Ins. 111., IX, 84. 



This European genus is represented in North America by three 

 .species. 



Key to Mecostethus, Fieb. 



A.I Prozone shorter than the metazone. Lateral carinae plainly sin- 

 uate and strongly divergent from the first sulcus to the posterior 

 margin. Posterior femora slender. 



B.' Scapular area of the tegmina with a pale streak. Intercalary vein 

 of the male with very obscure low dull teeth. . i. — Lineatiis, Scud. 



B.2 Scapular area without a pale streak. Intercalary vein of the male 

 with sharp, elevated, minute, closely-set teeth. . 2 — Gracilis, Scud. 



A. 2 Prozone as long as the metazone. Lateral carinas very nearly 

 straight and very gently divergent. Posterior femora not unus- 

 ually slender 3. — Plaptyptera, Scud. 



I. Mecostethus lineatus, Scud. Figs. 22a, 22b. 



Arcyptera lineata, Scud., 1862. Jour. Bost. Soc. Nat. Hist., VII, 462. 

 Arcyptera lineata, Scud. , 1874. Fin. Rept. Geol. Surv. N. H., I, 373. 

 Arcyptera lineata, Provancher, 1877. Faune Ent. du Can., 44. 

 Arcyptera lineata, McNeill, 1891. Psyche, VI, 66. 

 Stetheophyma lineata, Thos., 1873. Syn. Acrid. N. Am., 98. 

 Stetheophyina lineata, Thos., 1880. Nox. and Ben. Ins. 111., 105. 

 Stetheophyma lineata, Fernald, 1887. Orth. N. E., T^'i. 

 Stetheophyma lineata, Bruner. 3rd Rept. U. S. Ent. Com., 56. 

 Stetheophyma lineata, Morse, 1894. Psyche, VII, 105. 

 Mecostethus lineatus, Morse, 1896. Psyche, VII, 327, figs. 13, 13b. 

 ? Mecostethus variegatus, Walk., 1870. Cat. Derm. Salt., IV, 781. 

 ? Mecostethus variegatus, Thos., 1873.- Syn. Acrid. N. Am., 210. 

 Hab. New England to Northern Illinois and Iowa. 



