DISCUSSION OF GENERA AND SPECIES 39 



Morphological characteristics. Marginal spines (Fig. 16) arranged 

 in a very definite single row, quite large and sharply conical, their dis- 

 tance apart depending upon the size of the insect. In specimens taken 

 before the beginning of the period of rapid growth the spines are sep- 

 arated by intervals scarcely greater than the width of the base of a single 

 spine. Stigmatic spines scarcely or not at all differentiated, the stigmatic 

 clefts practically obsolete. Anal plates (Fig. \6G} very large, rather long 

 and narrow, with a varying number of setse near the apex, with as 

 many as five subapical setae on the ventral side and with as many as ten 

 fringe setae. Antennae (Fig. 165) rather short, normally 7-segmented, 

 the third segment conspicuously longer than any of the others. Legs 

 small, not stout, the claw with two slender digitules. Pores of the dorstim 

 abundant, small, not arranged in any definite manner. 



Second stage not available for description. 



First stage with three small stigmatic spines (Fig. 16F) in each 

 stigmatic depression and with marginal spines represented by a few slen- 

 der setse. Anal plates (Fig. 16>) of the form usual in the genus, but 

 with their dorsum presenting a tessellated appearance. Antennas (Fig. 

 16C) 6-segmented. 



Notes: The holotype is a mount of a specimen in the last instar but not 

 fully grown and with the derm still membranous. 



This species is one of a group to which belong L. caryae (Fitch) of the 

 eastern states and another species (certainly introduced) which occurs in Cali- 

 fornia and passes as L. cerasorum Ckll. From the former it differs in its much 

 more convex form and in having more hairs on the anal lobes. From the latter 

 it does not differ at all structurally, but this species remains destitute of secretion 

 at maturity and in life is so conspicuously marked with large white spots that it 

 has been called the "calico scale." Judging from the description of that species, L. 

 glandi Kuwana is very similar in appearance but differs in having the marginal 

 spines slender. 



Genus PHYSOKERMES Targ. 



The existing descriptions of this genus make no mention of its most 

 important character and in certain respects require modification. I pre- 

 sent the following diagnosis. 



Coccidae referable to the subfamily Coccinae, characterized, as are the 

 other members of this subfamily, by the presence of a pair of triangular, 

 supra-anal plates in the first and second instars, but differing from all 

 other members of this group by the absence of these plates in the last 

 instar, the plates being replaced at the second molt by a single median 

 lobe. Marginal spines lacking in the adult, the stigmatic depressions not 

 indicated. Antennae and legs either present or absent in the adult female. 



