PERGANDE NORTH AMERICAN PHYLLOXERINiE. 2I3 



young larvae, or both. As with the mother bark-lice of the galls 

 vitifolioe Fitch, caryce-venos Fitch and caryce-fallax Walsh MS., the 

 antennae of this mother bark-louse are three-jointed, joints i and 

 2 short and subequal, and joint 3 longer than i and 2 put together. 

 The young larvae are about o.oi inch long and of the usual shape. 

 Almost as soon as hatched — as is also the case with the larvae of 

 all the allied galls — these larvae stray away to found new galls. 

 The galls themselves are very abundant about July 24th,' but by 

 the 12th of August they were almost all empty and gaping open 

 below." 



Dr. Shimer, referring to the same species (Proc. of the Acad, 

 of Nat. Sci. of Phil., Vol. 19, 1867, p. 3), confounds it with his 

 Dak. globosum, which forms a similar though much larger gall on 

 the same leaves and produces a winged generation. Speaking of 

 the young of the smaller galls he says ' ' the young larva usually 

 leaves the gall as soon as hatched and proceeds, as does the 

 ' grape-leaf loUse' (Z?. ? vitifolioe), to construct a new gall." 



The following notes, made in the West some years ago, will 

 amplify the somewhat brief description of the gall by Walsh : 



Description of Gall. — Transeverse diameter 0.3-2™™- or slightly 

 larger. Vertical diameter 0.2-0.5™™-. Hemispherical and more 

 prominent above than beneath and frequently depressed at the 

 centre; the depression often running out to one side. More or 

 less projecting beneath, with a tendency to become sopewhat 

 conical, terminating in a short nipple, with a round or slightly 

 oval orifice, surrounded by 4-10 or more rather stout and pro- 

 fusely pubescent recurved bracts, completely closed when young. 

 Upper surface smooth, yellowish- green to brownish-yellow. 

 Rather tough and leathery and slightly semi-transparent at the 

 centre if held toward the light. 



This gall is usually extremely abundant on infected trees, 

 often to such an extent that every leaf is completely covered. 

 I have counted on some of the smaller leaflets over 300 of these 

 galls, many of which, to the number of 2-5 or more, were confluent. 



This appears to be an exclusive western species and has been 

 found at Kirkwood and elsewhere in the Mississippi Valley, upon 

 Hicoria glabra, maturing during the latter half of July and early 

 August. 



[Pkoc. D. A. S., Vol. IX.J a6 i", [Oct. 5, 1903.I 



