PERGANDE NORTH AMERICAN PHYLLOXERINjE. I9I 



Stem-mother. — I^ength o.6-i"">-; diameter across the thorax 

 about 0.7"™-. Pyriform, the older ones shorter and more glob- 

 ular. Color pale yellow, the older specimens somewhat darker, 

 with the head slightly dusky. Antennae and legs blackish. Eyes 

 small and dark purplish. Between the eyes are two small though 

 rather deep dusky punctures or fovese; two or three subdorsal 

 dusky spots or punctures each side of the pro thorax, and a more 

 or less distinct, transverse, dusky spot each side in the sutures of 

 the thoracic segments. Surface of body quite distincly though 

 rather sparsely and irregularly tuberculate, the tubercles minute 

 and pointed, more numerous around the margin and denser and 

 somewhat coarser on the head. Front of head gently arched and 

 slightly notched at middle. Antennae rather stout, joint i stout- 

 est, about equal in diameter, longer than wide, rounded at apex; 

 joint 2 somewhat longer and more slender, thinnest at base, the 

 apex rounded and apparently divided by three to four quite dis- 

 tinct, scaly annulations; joint 3 much the longest, and divided 

 by six or more rather coarse scaly annulations, its base forming, in 

 some specimens, a distinctly thinner and well separated petiole. 



Egg. — L,ength about 0.2"'™-, regularly ovoid, white, polished 

 and ornamented with regular, large, hexagonal facettes. 



IvARVA. — White or pale yellow, rather broadly ovoid, with 

 stout antennae and legs. Eyes red. Surface of body very sparsely 

 and indistinctly granulate. Two transverse rows of minute dusky 

 warts on the prothorax and a row of six similar warts on all other 

 segments. Front of head quadrangulate, the angulations quite 

 prominent, each bearing a short hair at tip. Rostrum long and 

 stout, reaching beyond the end of the body. 



Pupa. Elongate, ovoid. Color orange, the head with a 



slight dusky tinge; meso- and meta-thorax paler, the wing pads 

 and end of body almost white and with the external margin of 

 the wing pads, especially in more mature individuals, blackish. 

 Eyes brown, ocellar spots red or brownish. Antennae and legs 

 dusky. The whole surface of the body is densely covered with 

 minute, conical, blackish points. 



Migratory or Winged Female- — I^ength of body 0.8-1.2™™-. 

 Expanse 2.4-3™'"'. Color quite dark orange. Head, meso- and 

 meta-thorax, scutellum and sternal plate black. Antennse and 



