66 OHIO STATE ACADEMY OF SCIENCE. 



vitality not too greatly impaired, there are several spraying mix- 

 tures which can be used to advantage, viz., "Lime, sulphur and 

 salt wash," "Oregon Wash," "Resin Wash," "Whale-oil soap 

 wash, " " Potash Wash, ' ' Kerosene emulsion, Crude petroleum, etc. 

 The U. S. Dept. of Agriculture and various State Experiment 

 Stations have from time to time issued bulletins containing infor- 

 mation concerning the San Jose Scale, and recipes for the 

 preparation of the above washes. 



ASPIDIOTUS PICEUS Sanders. 

 Fig. 60. 

 A. piceus Sanders, Ohio Naturalist, iv, 4, p. 96 (1904). 



Scale of female: 1.8 — 2 mm. in diameter, flat often subelliptical 

 to oval, with sub-central exuviae; black shading to dark gray toward 

 margin, having the appearance of pitch covered with dust. The raised 

 shiny black, deciduous first exuvia is surrounded by an indistinct 

 ring like depression. When rubbed the second orange exuvia appears. 

 The young scales appear not unlike the young male scales of A. per- 

 niciosus. When removed a white patch is left. 



Scale of male: Elliptical, 1mm. in length, black, with distinct 

 ring-like depression surrounding the lustrous-black exuvia, the poster- 

 ior flap shading to gray. 



Female: With one pair of lobes, well-developed, prominent, broad,, 

 notched midway on lateral margin, with outer corners well rounded 

 off toward inner angle. Inner margins parallel, not close, bounded by- 

 large chitinous processes, which extend, somewhat reduced In density, 

 around the outer margin to a denser process at outer base of lobe. 

 Second and third lobes rudimentary, sometimes with inner angle of 

 second lobe slightly developed. Interlobular incisions broad and deep, 

 bounded by elongated chitinous processes, the inner usually the larger. 

 There are two perforations anterior to median lobes on a level with, 

 the base of chitinous processes of flrst incision. Between the median, 

 and second and the second and third lobes are pairs of di-pointed. 

 spine-like plates, two thirds of length of median lobes. On the dorsal 

 surface there is a spine on each of the second and third lobes, and on 

 the ventral surface, each lobe bears a spine on the lateral margin, 

 laterad of dorsal spine, also spines one-third and two-thirds of distance 

 to penultimate segment. First row of dorsal-pores (between first and 

 second lobes) of 2; 2nd row of about 6; 3rd row of 5 — 6; 4th row 

 (near margin) of 3 — 4 orifices. Four or five groups of circumgenital 

 gland-orifices, median sometimes wanting. Median, — 3; anterior 

 lateral, 15 — 23, averaging 18; posterior lateral, — 14, averaging 9. 



