96 BULLETIN 903, U. S. DEPARTMENT OF AGRICULTURE. 
nal structure, including relatively larger sensoria. To these small 
larvae has been given the name neogallicolce-radicicolce (young gall 
lice with root louse characteristics), while to the type which merely 
moves from one leaf to another younger one has been given the 
name neogatticolce-gallicolce (young gall lice with gall louse char- 
acteristics). 
On the European vine (Vitis vinifera), according to Grassi, winter 
eggs were rarely laid and galls rarely found, the majority of those 
found being imperfect. It was apparent also that growth was much 
slower than on American vine foliage. In Italy, from eggs pro- 
duced by nine gallicoles that had produced galls on a European 
vine, a few of the progeny had radicicole characteristics. This, 
however, was a rare occurrence, the great majority of young larvae 
hatching in galls on European vines showing the gallicole charac- 
teristics and thus not being destined for subterranean life. The 
Italian investigators were able to cause radicicoles to settle and 
produce generations of gallicoles on the leaves of a Clinton (Ameri- 
can) vine. This succeeded after several fruitless efforts. In this 
connection it may be said that, at Walnut Creek, on a small Golden 
Champion (American) vine, radicicoles ascending the stalk and 
ovipositing in crotches of the stem as high as 5 inches above the 
surface of the soil were observed in the fall of 1914. A few of the 
resulting larvae settled still higher up on petioles. Finally cold 
weather in November ended this aerial infestation either by killing 
the larvae or compelling them to descend below ground. 
On July 16, 1913, a shipment of eight leaves of an American vine 
well infested with gallicoles was received from Vienna, Va. The 
gallicoles were egg-laying females, probably of the second genera- 
tion (progeny of stem mothers), newly hatched larvae, and large 
numbers of eggs. Only one adult occurred in each gall. Four of 
these leaves were placed contiguous to foliage of three resistant 
vines. The varieties were Riparia X Rupestris 3309, Columbaud X 
Riparia, and Solonis X Riparia. The first two named, small vines 
in pots, each were inoculated with one infested leaf; the third vine, 
larger and growing in the vineyard, was inoculated with two leaves. 
In no case were galls developed on the foliage of the three vines 
inoculated. It is to be recorded that these three vines were of a 
different type from the infested vine, but the Eiparia type is sus- 
ceptible to gallicole infestation. 
On September 6, 1913, a selection of foliage of a Riparia hybrid 
infested with gallicoles was received from Washington, D. C. The 
following vines growing in the vineyard were inoculated with the 
infested foliage in close contiguity : Riparia X Rupestris 3309, Ru- 
pestris St. George, Rupestris X Berlandieri 301 A, Berlandieri X 
Riparia 34 E. M., Riparia X Cordifolia X Rupestris 111-8, Riparia 
