237 
but my present knowledge of the family is too limited to allow 
me to carry out such a scheme. 
In the few genera which I have examined the male genitalia 
are all built on the same type. The periandrium (figs. 13, 22) 
forms a large and comparatively simple tube; the penis forms a 
more or less short tube or ring from which arises a pair of 
processes more or less narrow and with ample apices; within the 
penis there 1s a small process which is sometimes trilobed, and 
on which the gonopore appears to be situated, and which may 
represent the true penis. 
Most species of this family are comparatively large and often 
gaily colored, and so they have been given more attention by 
collectors than the more obscure fulgorids. The family is a very 
homogeneous one. 
XV. FLATIDAE. 
Flatoides Spinola, Ann. Soc. Ent. Fr., VIII, pp. 204, 387 (1839); type 
Flata Fabricius, Ent. Syst. Suppl., 511, 517 (1798). 
Head generally narrower than thorax. Pronotum with the 
posterior margin generally roundly emarginate, in some case 
subangularly and in a few cases straight; mesonotum fairly 

PARE Ve 
1. Tettigometra sp. (Tettigometridae). Right side view of aedeagus and 
anal segment. 
2. Hilda breviceps (Tettigometridae). Right side view of male genitalia. 
3. Mnemosyne efferatus (Cixiidae). Right side view of male genitalia. 
4. Kinnara maculata (Cixiidae). Left side view of male genitalia. 
9. Achilixius singularis (Achilixiidae). Left side view of male genitalia. 
6. Phaconura froggatti (Cixiidae). Right side view of male genitalia. 
Borysthenes fasciolatus (Cixiidae). Right side view of aedeagus. 
8. Myndus caligineus (Cixiidae). Left side view of aedeagus. 
9. Stenocranus seminigrifrons (Delphacidae). Right side view of male 
genitalia. 
10. Ugyops kellersi (Delphacidae). Right side view of anal segment, 
aedeagus and genital styles. 
11. Ommatissus loufouensis (Tropiduchidae). Right side view of male 
genitalia. 
Lettering on figures: aed, aedeagus; ags, apodeme of genital styles; 
ap, apodeme of penis; as, anal style; a seg, anal segment; ejd, ejacula- 
tory duet; g1, anterior gonopophyses; p, penis; pa, periandrium; pg, 
pygofer. 
