— 166— 



1 (6) Antennae inpcrted in a deep cavity beneath a ledge. 



2 (5) Striation of the pronotum transverse. 



3 (4) Side margins of the pronotum sharply keeled, of moderate length 



Macropsis 



4 (3) Side margins of the pronotum not sharply keeled, very short, ..Bythoscopus* 



5 (2) Striation of the pronotum running obliquely from the middle of its front margin 



to its hinder angles Pediopsis 



6 (i) Antennae inserted in a feeble cavity, their base free. 



7 (8) Head with the eyes wider than the elytra at the base, membrane with an ap- 



pendix Idiocerus 



8 (7) Head with the eyes as wide as the elytia at the base, no appendix to the mem- 



brane Agallia 



In some of the genera the maiginal nerve of the wing is contmued 

 around the apex and joins the first radial near its middle, thus forming 

 an exterior apical cell, called by Fiebef the "supernumerary cell." This 

 cell is present in Macropsis, Idiocerus and Agallia, and absent in Bythos- 

 copiis and Pediopsis. Strangely enough, Fieber, in his Europceische 

 Bythoscopida, states the presence of this cell in genus Bylhoscopus in 

 which it does not exist, and its absence in Agallia where it is present. 

 The same error is repeated in his Cicadines d'Europa. I have examined 

 a number of European species of each of these genera, received from M. 

 Lethierry, and they agree with the American forms in differing from 

 Fieber's positive statement. But Fieber is not the only one who has 

 erred on this point, for as late as 1884 Mayr, in his Tabellen, has re- 

 versed these two genera exactly as Fieber did before him. If these later 

 papers are not mere compilations from Fieber's synopsis of 1868 these 

 discrepancies are quite inexplicable to me. 



Of the genus Agallia two species have thus far been described from 

 this country : 



Agallia sanguinolenta. 



Bythoscopus sauguinoleiitiis Piov. Naturaliste Canadien, vol. IV, p. 

 376, 1872. 



Bythoscopus siccifoliits Uhler, Bull. U. S. Geol. and Geog. Surv., vol. 

 II, p. 359, 1876. Wheeler's Rept. of the Chief of Eng. for 1877, 

 p. 1334. Van Duzee, Can. Ent., vol. XXI, p. 9, 1889 {Agallia). 



Through the kindness of M. Provancher I have had the pleasure of 

 examining a typical example of his species and have thus been able to 

 compare it directly with Mr. Uhler's description, and find that it agrees 

 in every particular. It is not an uncommon species here on grass and 

 weeds in pastures and roadsides, especially where Carex and Juncus 

 abound. 



* The striation of tlie pronotum in this genus is not strictly transverse, but toward 

 the anterior margin especially it is quite oblique ; thus approaching some forms of 

 Pediopsis. Dr. Fitch has described six species under Athysamis. 



