Pomona College, Claremont, California 53 
Lingula partially obscured, spatulate, distal end spherical and 
densely setose. The submarginal area bears a continuous row of 
conspicuous circular pores which are about 0.014 mm. in diameter 
and which project somewhat from the case. The submarginal 
area is set off from the dorsum proper by a raised ridge which is 
continuous around the case save in the cephalic region. The cren- 
ulations of the margin are broad and well rounded, the incisions 
shallow. Marginal wax tubes project mesad about one-third the 
width of the margin. Thoracic tracheal folds not evident. A pair 
of fine, delicate caudal spines are present just within the caudal 
margin, set in tubercled bases. On the suture lines extending 
cephalad from the vasiform orifice is a pair of very fine delicate 
hairs set in circular bases. Cephalo-lateral and caudo-lateral mar- 
ginal spines are lacking. 
Adult :—Length about 0.65 mm.; color yellow with the head 
and thorax lighter. Eyes dark red, constricted but not divided. 
Wings immaculate, forewing with Radius J, cubitus and media 
present; media short, faint and poorly defined. Paronychium 
blade-like. The antennae of all specimens were broken. 
Described from material taken by F. W. Herbert, for whom 
the species is named, at Pleasanton, Alameda County, October 1918, 
Fig. 4. Tetraleurodes herbeti n. sp. a, pupa-case; b, vasiform orifice. 
