TRIBE LEUCASPIDINI 263 



may be taken as the type. The following is a translation of the 

 tables of Lindinger: — 



SECTIONS OF LEUCASPIS 



a. Scale elongate, widened In front and not behind. Pygidium of first 

 and second nymplial females with comb-like todthed plates, distinct- 

 ly separated from lobes. Euleucaspis Lindgr. 



aa. Scale elliptical or oval. Pygidium of first and second nymphal fe- 

 males with lobes and plates formed like lobes Salicicola Lindgr. 



SUBDIVISIONS OF EULEUCASPIS 

 a. First nymph with deep constriction between prothorax and meso- 



thorax. Scale gradually widened Suturaspis Lindgr. 



aa. First nymph not with deep constriction. Scale suddenly widened. 



Pusillaspis Lindgr. 



The following tentative tables include most of the described 

 species. They are based for the most part upon the characters 

 used by previous authors in describing and differentiating species. 

 The tables will aid in the identification of the various genera and 

 species. Attention has already been called to the necessity for 

 careful extended studies of the pygidium of the second nymphal 

 female. Such studies are also needed to determine whether the 

 lobes of the adult female are not frequently true lobes, as their 

 size, form, and arrangement would suggest. This conclusion is 

 confirmed by the characteristic number of the projections, 2, 2, 3, 3, 

 between these so called primary lobes. 



GENERA OF LEUCASPIDINI 

 a. Pygidium of adult female with groups of genacerores. 



b. Pygidium of first and second nymphal female with lobes, 

 c. Pygidium of adult female with lobes, never with pseudolobes. 

 d. Pygidium of adult female with lobes and distinct pectinae 

 or pla;tes; pygidium of first and second nymphal females 

 with lobes and distapectinae; first nymph, so far as known, 



with mesocoria forming distinct constriction 



Leucaspis Targ. 



dd. Pygidium of adult female without lobes, at most only with 



lobe-like projections; pygidium of second nymphal female 



with distapectinae; first nymph with mesocoria not forming 



distinct constriction. Anamaspis Leon. 



cc. Pygidium of adult female without lobes, pectinae, or plates, 

 but always with pseudolobes; first nymph with mesocoria not 



forming distinct constriction Acfcnaspis Leon. 



bb. Pygidium of first and second nymphal females with lobes, with- 

 out pectinae, plates represented by lobe-like projections; first 



nymph with mesocoria not forming distinct constriction 



Salicicola Lindgr. 



