620 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



Oil the under side of the leaf it is much larger thau in any of the 

 other leaf-galls, conical, either slightly narrowing apically or, more fre- 

 quently, slightly enlarged. The sides are vertical or nearly so; the 

 top broadly rounded without median depression or central nipple. 

 Size very variable ; averaging in height C to 7""", and in diameter at 

 base 4 to 5""°. Color pale greenish yellow, with the tip more brownish ; 

 surface opaque, rugosely reticulate; at base often covered with a 

 whitish pruiuescence, rarely with a few scattered hairs near the top. 

 (Fig. 202, a.) 



.:^ 



Fig. 202.— GM of Pachypsylla c. -mamma: a, leaf with 

 galls from underside — natural size ; b, section of gall 

 showing cup-lilie depression, and insect in cavity ; c, 

 pupa— enlarged. (After Riley.) 



The walls of the gall are hard and woody, at the bottom averaging 

 l.TS-"™, at the roof 0.75'"'^ in thickness. The cell (Fig. 202, h) is large, and 

 in cross- section much more 

 crescent-shaped than in the 

 preceding species. The ma- 

 ture pupa issues through an 

 oval slit sawed through the 

 roof, always near the side 

 where the wall is less thick. 



42. P. ceUidis-puhescens n. 

 sp. — This gall on the upper 

 side of the leaf is represented 

 bj'^ a small circular cup-shaped 

 impression, surrounded by a rather wide, thickened, and elevated 

 margin, and furnished at the bottom with a small, usually star- 

 shaped, median nipple. The bottom and sides of the impression are 



Fig. 203. — Pachypsylla c. -mamma: adult — enlarged. 

 (Original.) 



