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1 (6) Antenne inserted 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 
tobtsvhindervang les yo: sewer eis svg ete atm ns ee Pediopsis 
6 (1) Antenne 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- 
PSI GIR sarc intts celal sya Naa Ce een ames orca on Metta is eee ee Idiocerus 
8 (7) Head with the eyes as wide as the elytra at the base, no appendix to the mem- 
PDP TNG AE ye sak AON ws ace ohana lee AgOue Re ote de to tak o eI nett aoe Agallia 
In some of the genera the marginal nerve of the wing is continued 
around the apex and joins the first radial near its middle, thus forming 
an exterior apical cell, called by Fieber the ‘‘supernumerary cell.” This 
cell is present in A/acropsis, /diocerus and Agadla, and absent in Bythos- 
copus and Pediopsis. Strangely enough, Fieber, in his Huropeische 
Lythoscopida, states the presence of this cell in genus Byshoscopus in 
which it does not exist, and its absence in Agadlia where it is present. 
The same error is repeated in his Crcadines d’ Europa. J 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 Zadellen, 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 Agadla two species have thus far been described from 
this country : 
Agallia sanguinolenta. 
bythoscopus sanguinolentus Prov. Naturaliste Canadien, vol. IV, p. 
376, 1872. 
Bythoscopus siccifolius 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 (Agad/ia). 
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. Uhbler’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 /uncus 
abound. 
* The striation of the pronotum in this genus is not strictly transverse, but toward 
the anterior margin especially it is quite oblique ; thus approaching some forms of 
ediopsis. Dr, Fitch has described six species under A/Aysanus. 
