276 THE COCCIDAE 



only slightly longer than portion caudad of it, al- 

 ways less than twice as long. Coccomytilus Leon. 



gg. Body with metacoria located distinctly caudad of 

 middle of its length; portion of body cephalad of 

 metacoria more than twice as long as portion caudad 



of it. — Type, Dinaspis ichesii Leon Dinaspis Leon. 



ff. Pygidium of adult female with caudal end broadly 

 truncate and bearing three pairs of pointed, triangu- 

 lar, equidistant, similar, subequal lobes; scale of male 

 and female with six or more prominent transverse con- 

 strictions. Allantomytilus Leon. 



ee. Adult female with mesothorax and metathorax separated 

 by deep transverse constriction; pygidium with three pairs 



of lobes. Opttintiaspis Ckll. 



dd. Pygidium of adult female always with distinct lattice-shaped 

 thickenings; brevaceratubae few in number or wanting. — 



Type, Ischnaspis spathulata Lindgr Parischnaspis MacG. 



cc. Pygidium of adult female without plates. 



d. Pygidium with median pair of lobes at most never more than 

 twice width of median lobe apart. 



e. Pygidium with two pairs of distinct lobes, median pair 

 as large as second pair; preabdomen with caudo-lateral 

 angles of segments with strong finger-like processes. — 



Type, Mytilaspis argentata Ckll Nivcaspis MacG. 



ee. Pygidium with two pairs of lobes, median pair minute^ 

 indistinct, not more than one-sixth width of second lobe; 

 preabdomen with caudo-lateral angles not with finger-like 

 processes. — Fernaldella Leon. — Type, Mytilaspis indentata 



Green. Fcrnaldanna MacG. 



dd. Pygidium with median pair of lobes four or more times width 

 of median lobe apart; median and second pairs of lobes 



minute. — Type, Mytilaspis beyeriae Green 



Maskellanna MacG. 

 bb. Pygidium of adult female without lobes or plates, with four stout, 

 equidistanit, conical projections extending from surface of pygi- 

 dium beyond its margin. Plxaulomytilus Leon. 



SPECIES OF TRICIIOMYTILUS 

 Pygidium with median pair of lobes prominent, bluntly rounded, longer 

 than broad, entire, distant: second pair of lobes large, incised, mesal 

 lobelet much smaller than lateral, bluntly pointed, entire; third pair 

 of lobes broad, deeply and broadly incised, lobelets bluntly pointed, 

 subequal, entire; fourth pair of lobes deeply incised, similar in size 

 and form to third pair; plates arranged 0, 3, 3, 3, 2, long and slender, 

 much longer than lobes; genacerores 5-6(13-18)19-24. — Australia on 

 Eucalyi^tus. formosus Mask. 



SPECIES OF TRIASPIDIS 

 a. Pygidium with second pair of lobes not incised, at most only notched, 

 b. Pygidium with furcapectinae between lobes. 



