72 BT7U1ZTIX B26, IT. S. DEPARTMEliPE OF AGRICULTURE. 
certain that this species is a true Pemphigus. This will thus make 
I - genus Amycla a synonym.. 
In 1547 Rondani described the genus Aphioides of which bursaria 
Fab. was indicated as the type and Aphioides. therefore, is a synonym. 
In IS 54 Koch erected the genus Pachypappa of which marsupialis 
K h has been made the type. Jdarsu ' lis } however, is a typical 
Pemphigus. Pachypappa Koch ; therefore, must become a synonym. 
Tullgren [1909] used Pachypappa in a different sense, but this is 
discussed under the genus Pachypappeila. 
In 1886 Lichtenstein erected the genus Xessleria for $piroil\ica 
and this name was replaced by Hamaclryaphis Kirk, in 1904. A 
study : this species, however, shows that it is a typical Pemphigus. 
Therefore, these two names will become synonyms. 
Characters. — Cornicles present; wax plates, if present, weakly developed; stem- 
niother -with four-segmented antennae: alate form with six-segmented antennae which 
are armed with narr :~\ : . "_ :: simewhat irregular sensoria. Fore wings with the 
media simple: hind wings with rtih media and cul ::.>: | : sent. Sexes small, apter- 
QSj and beakTes3. O ::. rous female developing only one egg. 
I . ma living in galls, the stem-mother and her offspring in the same gall, the alate 
forms ty] i : lly I ving the _ Us in th :- ~ ring. 
T;rpe fixed by Passerini. > . Aphis bursaria L. 
Genus PHLOEOMYZU5 Horvath. 
Plate XI, W-BB. 
1SS6. Lowia Lichtenstein, iloru Puceron PenpL, r. 17. 
1S96. Phloeomuzus Horratli, Wier . Rut. Zeit., v. 15, p. o. 
In 1886 Lichtenstein erected the genus Lowia with Schi& leura 
i ' .' Sig. as type but as this name had been used previously it 
was repla ■-.- Lia 18 ■■:• by Phloeomyzus Horvath. 
It is with some hesitation that the writer places this genus in the 
Pemphigini. In some respects it suggests the Melaphini. while 
in many respects it strongly suggests the Thelaxini or even the 
Phyuaplndina. Indeed, tc ALlaphini it shows striking 
resemblances. Without a study of the sexual forms it will be very 
difficult to place fcl . -nus definitely. Ail that can be done at the 
sent time is to place it tentatively with 1 ich it 
appe nd if further s idy shows t hieorrect 
he genus ed definitely with its alii 3 
micles - ----- ly I - with six- 
- _ . :- which 
slender and wi:-. u :. ".. ry £ nsoria. Fore vr: the media once branched, 
hind ^ i lx)th media \ sent. Large wax p] 
abdomen. Wings held fiat in rej 
Forms living free upon the bark 
pe monotypical , Schu 
vilko fr saw, 
Poland, and notes by Pergar. - pecimens loaned by Horvath. 
