BYTHOSCOPIN.^:. 183 



Subfam. II. BYTHOSCOPIN^. 



Bythoscopidse, Du/irii, Catal. Hem. p. 84 (1859) ; Van Duzee, Ent. 



Amer. v, p. 165 (1889) ; id. Trans. Am. Ent. Soc. xix, p. 296 



(1892). 

 Bythoscopides, Sahlh. Not. Fenn. xii, n. s. p. 08 (1871). 

 Bythoscopina, Bery, Hem. Aryent. p. 276 ( 1879). 

 Bythoscopini, ruto)i, Cat. He?n. Pal. p. 77 (1886) ; Melich. Horn. 



Faun. Ceylon, p. 14(i (1903). 

 Ao-alliinae, JS^irk. Hep. Exj). Stat. Haw. Plant. Assoc, pt. ix, p. 345 



'(1906). 



Ocelli on the face below the anterior edge of the head ; vertex 

 narrow and confounded with the front, or apparently wanting, 

 the head being entirely deflexed ; tegraina membranaceous or 

 slightly thickened. 



The Bythoscopinse are readily recognized by the above characters 

 and scarcely any other diagnosis is necessary. 



As regards the habits of the Bythoscopinje, and indeed of other 

 Jassids, Prof. Ball of the Utah Agricultural College, U.S.A., 

 makes some signiiicant remarks : — " In giving food-plant records it 

 seems desirable to distinguish those records that are the result of 

 repeated observation, or made under circumstances that admit of 

 slight chance for error, from those that are based on accidental 

 occurrence of one or more specimens upon some given plant. The 

 adults of most all of our leaf-hoppers fly very readily and are often 

 found on plants adjacent to tlie one they feed upon, especially 

 after a sweep net has been vigorously used in the neighbourhood. 

 And too often there is no means of knowing whether the record 

 is the result of one accidental specimen or the summation of a 

 life-history study." 



Synopsis of Genera. 



A. Upper apical or post-costal cell of tegmina of 



ordinary size. 



a. Ocelli on the face between the eyes. 



a. Ocelli placed nearer to eyes than to each 



other. 

 a' Front (including face) about as long as 

 broad. 



a^. Tegmina with four apical cells .... Idiocerus, p. 184. 



b'. Tegmina with three apical cells . . Balocha, p. 189. 

 b'. Front (including face) short and broad. Bythoscopus, p. 190. 



b. Ocelli placed as near to each other as 



to eyes. 

 a . Scutellum very long and broad, longer 



than pronotum and vertex together . Chunra, p. 193. 

 b' . Scutellum about as long or a little 



shorter than pronotum Agallia, p. 194. 



b. Ocelli on front just beneath the anterior 



margin of the vertex ; scutellum not more 



than half as lon^- as pronotum Mooxia, p. 197. 



B. Upper apical or po.st-co.stal cell of tegmina 



very large and broad ... Busoxia, p. 198. 



