PERGANDE NORTH AMERICAN PHYLLOXERINiE. 247 



architects in their different stages, as far as examined, show no 

 differences by which to separate them from the typical carycecaulis. 

 The galls of this variety vary from 4-20™"- in size, the normal 

 being about lo"""-. They occur on the under side of the petiole 

 and the base and often the midrib of the leaves, and, when in the 

 latter position, they generally project somewhat on the upper side. 

 The shape varies from globular to sub-conical, or broadly ovoid. 

 The surface is quite densely covered with a minute pubescence 

 which gives it a slightly velvety appearance. The orifice beneath 

 is rather small and transverse and tightly drawn together before 

 maturity. Color' greenish-white to yellowish-green beneath and 

 beautifully crimson on the upper side. Usually single, though 

 occasionally two or more may become confluent, with their cells, 

 however, well separated. 



Phyi,i,oxEra spinuloida Pergande, n. sp. 



PI. XVII., figs. 128 130. 



The galls of this species, as already remarked, are very similar 

 and closely related to those of spinosa, for which, without com- 

 parison of the migratory females, they might easily be mistaken. 

 They are, as a rule, more regularly globular, or but slightly con- 

 ical, covered with numerous irregular, more or less radiating, low 

 ridges, which are rather plentifully provided with irregular, long, 

 fuzzy, fleshy spines or filaments. They grow generally upon the 

 petiole of the leaves, which they often almost completely encircle, 

 causing, at 'the point of junction with the petiole, a curve or bend. 

 They also occur on the midrib of the leaves. When mature each 

 gall bursts at the apex in a more or less irregular opening. The 

 diameter of those examined varied from 5-15™"'. The color 

 appears to be quite uniformly greenish-yellow, or brownish-yellow 

 on one side. 



Migratory female.— lycngth of body 0.6-1 .8™"- Expanse 

 of wings 3.6-3.8"'"-. Color orange. Head, antennae and legs 

 dusky. Meso- and metathorax and sternal plate purplish-black. 

 Eyes black. Ocelli clear and with a blackish border at the inner 

 side. Prothorax marked with three pale dusky spots, of which 

 the two smaller are placed in front. Antennse slender, scaly, the 

 two basal joints nefirly equal in length ; joint 3 almost globular, 



