70 BULLETIN 826, U. S. DEPART^IEXT OF AGRICULTURE. 
In some respects the genus is suggestive of Anoecia, although .ifc 
seems to be undoubtedly a Pemphiginid and will no doubt be so 
proven by the sexual forms. 
In 1917 Matsumura erected his genus Watabura with Watabura 
nishiyae Mats, as type. This species was stated to resemble a Pem- 
phigus, excepting that the antenna! segments are somewhat different 
and only one oblique vein is in the hind wing. (Two obliques are 
shown in his PL XII, 9) . The antennas are armed with narrow trans- 
verse sensoria and there seems little doubt that this genus is a syno- 
nym of Dryopeia. It is noteworthy that the life history of the type 
species is not known, but it is thought to live on the roots of trees. 
The type of the genus Dryopeia is a root feeder. 
Characters. — Cornicles present, situated on broad shallow cones, suggestive of those 
of Anoecia. Stem mother unknown, apterous forms with six-segmented antennae. 
Alate forms with six-segmented antennae, armed with narrow transverse sensoria. 
Fore wings with media simple, hind wings with one oblique vein. Summer forms 
subterranean, living on the roots of plants. Spring forms and sexes unknown. Apter- 
ous tarsi one-segmented. 
Type (fixed by Kirkaldy. 1906). Endels bella Koch. 
Genus MORDWXLKOJA Del Guercio, 
Plate XI, A-G. 
1909. Ifordicilkoja Del Guercio, Eivista Patol. Veget., v. 4, p. 11. 
This genus was erected in 1909 for the peculiar species Byrsocrypta 
vagabunda Walsh. This differs in the antennas quite remarkably 
from all of the other species belonging to this tribe. The difference 
is in the long unguis of the sixth segment. However, the other char- 
acters and the four-segmented nature of the antennas of the stem 
mother seem to place it with little doubt in the Pemphigini. 
There has been some doubt cast by Oestlund on the determination 
of "Walsh's species and this has led Cockerel! to propose the name 
oestlundi for the species now known so well, but, as Gillette has 
pointed out, Walsh evidently accepted the insect of Riley and Monell 
as the same species as his vagabunda-. The insects Riley had were 
undoubtedly the species we know and the writer therefore accepts 
vagabunda and the generic name Mordwilkoja. The genus was 
erected with the name vagabunda used as type and not oestlundi 
Characters. — Cornicles present as somewhat elevated lings. Stem mother with four- 
segmented antennae, the unguis of segment VI slender and Aphis-like, Permanent 
sensoria ciliate. Alate form with five -segmented antennae which are armed with 
narrow transverse sensoria. Fore wings with the media simple, hind wings with both 
media and cubitus rjresent. 
Forms living in galls; the stem mother and her offspring living in the sain* 1 gall, the 
alate forms leaving the galls in spring or early summer. Sexes unknown, but no 
doubt small, apterous, and beakless. 
Type (monotypical). Byrsocr<; ivnda Walsh. 
