4IO CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



were hatched and had passed into winter quarters. The 

 descriptions of the various stages in the development of the 

 male and female, and notes on the habits of this species, 

 will occupy the major part of this paper. 



I have to acknowledge my indebtedness to Mr. T. H. 

 Pergande of the Division of Entomology, U. S. Department 

 of Agriculture, who, after an examination of my specimens 

 determines the scale to be new (with D. citri and D. -poce 

 showing most resemblance to it). 



This paper was prepared in the Entomological Laboratory 

 of Stanford University, under the direction of Professor 

 V. L. Kellogg. 



I. Description of the Species. 



Dactylopius sequoiae, sp. nov. 



Plate XXVII. 



1. The Egg. — The egg is ovate in form, averaging about 

 .37 mm. in length, and .2 mm. in breadth at the widest part. 

 In newly laid specimens the color is a transparent, light lemon 

 yellow, but after a few days it gradually changes to a darker 

 yellow, probably on account of the developing embryo show- 

 ing through the transparent shell. The average number of 

 eggs laid by each female is about seventy-five. 



2. The Larva. {First Stage, fig. i). — On emerging 

 from the egg the young are very small, averaging about .4 

 mm. in length, and .2 mm. in breadth. The general shape 

 of the body is elongate oval, widest at the middle, beginning 

 to taper rather abruptly at a point about 5 ytt distant from the 

 middle on either side. The extremities of the body are 

 slightly truncate. The color is at first a rather dark yellow, 

 but soon changes to the characteristic grayish color. The 

 integument of the young larva is quite transparent, revealing 

 such of the internal organs as are not of themselves trans- 

 parent. 



The segments composing the body are not easily made 

 out but seem to be at least thirteen, viz. : one to the head, 

 three in the thorax, and nine abdominal, although the ninth 



