218 SPnEGID/E. 



truncate at apex or steeply sloped ; legs simple, intermediate tibiae 

 with one apical spur. Neuration of the wings vari- 

 able* — fore wing with one radial cell not appen- 

 dieulate, three or, by the obliteration of the 2nd 

 transverse cubital ner\ ure, two cubital cells (Smith's 

 genus Farapisoii) : when three cubital cells are 

 present, the 1st receives the 1st recurrent nervure 

 near or at the extreme apex, the 2nd cell receives 

 Fig. 54.— Piso^i the 2nd recurrent nervure in the middle, or near 

 argentatum, or at the extreme apex, sometimes the 2nd recur- 

 ? • T- rent nervure is received near the base of the 3rd 



cubital cell ; when only two cubital cells are present each receives 

 a recurrent nervure, the 1st cell at the apex, the 2nd at or near 

 the base. Abdomen pseudosessile, with the margins of the basal 

 t\\ o or three segments constricted above. 



Key to the Species. 



A. Fore wing with three cubital cells. 



a. Head, thorax, aud abdomen with silvery 



pile. 

 a'. Median segment posteriorly truncate 

 or concavo-truncate. 

 a^. Basal abdominal segment closely, 



remainder sparsely punctured .... P. rugosum, p. 218. 

 h^. Abdomen with only a few scattered 



punctures P. suspiciosum, p. 219. 



c^. Abdomen impunctate, smooth and 



shining P. punctifrons, p. 219. 



b'. Median segment rounded posteriorly, 

 not truncate. 

 a^. Median segment with a wide medial 

 longitudinal furrow bearing a carina 



down the middle P. argentatum, p. 220. 



J^. Median segment with no furrow, 



coarsely obliquely striate P. striolatum, p. 220. 



b. Head, thorax, and abdomen with golden 



pile P. kohlii, p. 220. 



B. Fore wing with two cubital cells. 



a. Legs conspicuously red P. erythropus, p. 221. 



b. Legs piceous brown. 



a' . Scutellum and postscutellum longitu- 

 dinally furrowed. L. 9-10 mm P. agile, p. 222. 



b' . Scutellum not furrowed. L. 7 mm. ... P. rothneyi, p. 221. 



c. Legs black, no tint of red or brown P. obliteratum, p. 222. 



Division A. — Fore winy with three cubital cells. 



409. Pison rugosum. Smith, Cat. iv, p. 313, $; Kohl, Verh. zool.-bot. 

 Ges. Wien, 1884, p. 188 ; Cam. Mem. Manch. L. Ph. Soc. (4) ii, 

 1889, p. 118. 



* I have taken specimens of Pison with three cubital cells in one fore wing, 

 only two in the other. Such seems also to be the case with the allied genus 

 Taranga, Kirby. Kohl unites Taranga to I'ison ; but from a careful examination 

 of the type, I have come to the conclusion that they are distinct. 



