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IOWA ACADEMY OF SCIENCE 
F. Joint 1 of antenna incrassate, apex produced in a spine beyond 
insertion of joint 2 6. PNIRONTIS 
FF. Joint 1 of antenna not produced beyond the insertion of 
joint 2. 
G. Apex of head at base of rostrum unarmed; joint 1 of ros- 
trum extending caudad of eyes, nearly twice as long as the 
two apical joints together; fore femora unarmed 
7. PYGOLAMPIS 
GG. Apex of head produced into a short, porrect obtuse spine 
on each side at base of rostrum; joint 1 of rostrum extend- 
ing to caudal margin of eyes, subequal in length to the two 
apical joints together; fore femora with a double series of 
short spines below 8. GNATHOBLEDA 
EE. Head unarmed below or armed with a simple spine; rarely 
with a subfurcate spine at sides of base. 
F. Ocelli not at all or only slightly elevated; postocular part of 
head not at all or very slightly and uniformly narrowed 
caudad 10. STENOPODA 
FF. Ocelli considerably elevated, postocular part of head short, 
strongly narrowed caudad (margins as seen from above, 
curved). 
G. Joint 1 of rostrum nearly as long as or longer than joints 
2 and 3 together. 
H. Joint 1 of rostrum slightly longer than joints 2 and 3 
together; hind femora not reaching apex of abdomen; fore 
femora armed beneath; head produced cephalad from 
bases of antennae 9. SCHUMANNIA 
HH. Joint 1 of rostrum slightly shorter than joints 2 and 3 
together; fore femora unarmed, slightly incrassate; hind 
femora scarcely reaching apex of abdomen; head not 
produced cephalad from bases of antennae. 12. DIADITUS 
GG. Joint 1 of rostrum not longer than joint 2. 
H. Joints 1 and 2 of rostrum of equal length; fore femora 
very little thickened, unarmed; hind femora reaching be- 
yond apex of abdomen ll.NARVESUS 
HH. Joint 1 of rostrum much shorter than joint 2; fore- 
'femora incrassate, with small spines below; hind femora 
just reaching apex of abdomen. . . .13. ONCOCEPHALUS 
DD. Anal areole of membrane extending farther proximad than costal 
areole. 
E. Ocelli farther apart than the eyes. Apiomerinae 33. APIOMERUS 
EE. Ocelli not so far apart as the eyes. Zelinae. 
F. Posterior lobe of pronotum inflated, produced backward over 
scutellum and also nearly covering anterior lobe 
37. NOTOCYRTUS 
FF. Pronotum not inflated nor produced over scutellum. 
G. Sides of mesosternum without a tubercle or fold in front. 
H. Fore femora as long as or longer than hind femora; joint 
1 of rostrum much shorter than joint 2. 
