1947] 
Cerceridce 
3 
clypeus and the outer part of lateral lobes only 
yellowish, lateral face-marks mostly above clypens. 
insolita 
4. Hind femora wholly pale ; abdomen with all segments 
broadly yellow; venter mostly yellowish, spots on 
vertex arno 
Hind femora black, venter also, and other femora 
mostly black , 5 
5. Small ; with pale band on third ventrite, scape wholly 
black; first segment small, not equal one-lialf of 
second behind; abdomen coarsely punctate, enclo- 
sure mostly smooth, with median groove ... melanthe 
Rather large; scape with pale spot below; first seg- 
ment of abdomen broad, equal to one-half of second 
behind, enclosure roughened, irregularly striate; 
abdomen finely punctate denticularis 
6. Clypeal projection in form of a large cone, the base 
occupying almost all of clypeal surface, tapering 
above to a point ; wings brown, enclosure large, 
with a smooth pale spot in middle macrosHcta 
Clypeal projection not in form of such a large cone 7 
7. The projection, short, edge concave, with two mem- 
braneous plates hanging beneath ; propodeum with 
or without lateral stripes femur-rub rum 
The projection has no such plates pendent beneath 8 
8. Clypeus with one or two small pointed teeth a little 
above lower margin of clypeus 9 
The process on clypeus is of other shape 10 
9. Two teeth on clypeus ; very large species, with very 
broad face grandis 
One tooth only on clypeus ; rather small species ; face 
of normal width atliene 
10. All femora largely black, venter black, clypeal process 
twice as broad as long, not divided, black beneath. 
nigrescens 
Femora not black, if partly black then venter has 
much yellow 1 1 
11. Very large, almost wholly yellowish or rufous, last 
joint of antennae wholly black; second submarginal 
cell very large, sides strongly convex, pedicel not 
