189 
Table of the Genera of American Fossil Limnobine. 
og) a single submarginal cell. 
. The normal first posterior cell, lying (in forms peyiae but one submar- 
ginal cell) between the second and third longitudinal 
veins, closed, forming at base a supernumerary discal 
CEllS Foe creas sews ldeacts Aawas ota ee = Cyttaromyia. 
' b?, First posterior cell open throughout. 
Ge VENICE EIS E MC GNIS oot giao tenchs cus ciale) hom sat nid cieid aie o's) te Oryctogma. 
c?. Four posterior cells. 
d'. The first longitudinal vein ends in the second longitudinal vein. 
el. Discal cell closed; submarginal much longer than first 
postentoneellls Wats. c ee teat ago pints Dicranomyta. 
e?, Discal cell open; submarginal scarcely longer than first 
OSL RICE CSM iors area nyse cast Soto laratas Spiladomyia. 
2. The first longitudinal vein ends in the costa. 
el, A marginal cross vein. 
fl. Marginal cell excessively long, much exceeding in 
length the breadth of the wing........ Limnocema. 
f2. Marginal cell normal, not so long as breadth of cell 
(applicable to fossil species only).......... Antocha. 
G2, NOMmarpinall (CrOSSiVielNtyysa/apeeisre aiciore siciave er Rhamphidia. 
A?. Two submarginal cells. 
bt, Third longitudinal vein arising at normal distance from the second. 
cl, First submarginal cell not, or hardly more than, half as long as the 
SECOUGE Mtetre se tepe cintn cys eta aisahetevensyern stares Gonomyia. 
c?, First submarginal cell much more than half as long as the second. 
d!, Tibize without spurs at the tip. 
e!, Auxiliary vein ending at a distance beyond the origin of 
the second longitudinal vein considerably more than 
equal to the breadth of the wing; third posterior cell 
DEtOlAte srrar te, cctenaresa acckeqa ofererstae eke eta7 os Cladoneura. 
e?, Auxiliary vein (in the fossil species) ending at a distance 
beyond the origin of the second longitudinal vein less 
than, sometimes only about half, the breadth of the 
wing; second posterior cell petiolate...... Cladura. 
d2), Tibice withispursiat thei tip’. as). cierto cise ert -taers Limnophila. 
b?, Third longitudinal vein arising from the second at a very short distance 
beyond the base of the latter......... Pronophlebia. 
Tribe CYLINDROTOMINI. 
This tribe is placed first in the series instead of near the end 
really because the arrangement of the table just given requires the 
early appearance of the two genera recognized in the American 
