DactylopiiiK^. 395 



biarticulate lip, but in the advanced stage we have never been able to see it in 

 its entirety. The abdominal extremity, rugose and strongly punctate, 

 approaches that of the Lecaniidcc and more especially of the genus Aclerda, 

 with a horny thickening, but without the caudal squamae of the Lecaniidce. 

 The anogenital ring is large, in a wide circle, finely punctate and transversely 

 striate, with six hairs which do not project beyond the abdomen.' 



Though this description really relates to a single species only {purpurea), it 

 may be accepted so far as it goes, with the exception that the antennas can 

 scarcely be described as ' multiarticulate,' there being — at most — but four distinct 

 joints, while in some species the number is reduced to two. The definition of 

 the form of the body and of the hairs of the anal ring must be regarded as of 

 specific importance only. 



The genus is of widespread distribution, in both hemisperes, though only 

 about fourteen species have been recognised. They are confined to plants of 

 the order Graminece. 



Synopsis of Species occurring in Ceylon. 



Species completely covered with a felted or cottony ovisac. 



{a) Abdominal segments evenly rounded indica. 



{b) Terminal abdominal segments demarked by slight lateral 



indentations viaritima. 



Species naked or without complete ovisac. 



{a) With a distinct flattened pygidiform anal segment. bambuscE. 



{b) Posterior extremity globose, with no demarked anal 



segment sonata. 



ANTONINA INDICA, Green. 



(Plate CLXV.) 



Antonina indica, Green, Mem. Dep. Ag. Ind., Ent. Ser., Vol. II. p. 2 (1908). 



Female enclosed in a felted white sac {Jig. 2) which fits closely upon the 

 body of the insect, but is easily removable in a single piece. This covering 

 often becomes yellowish, especially after the death of the insect. The sac is 

 open at the part covering the rostrum and at the posterior extremity, from which 

 point a brittle glistening tubular filament projects. The liquid excreta are 

 carried to the extremity of this tube where they gather in the form of a globular 

 bubble which eventually bursts, scattering the liquid in a fine spray. 



Adult female {figs. 3, 4) dark purplish brown, usually paler on the ventral 

 surface, the stigmatic and genital orifices dusted with white mealy powder. 

 Surface smooth. Form subovoid to subcircular ; sometimes narrowed behind, 

 sometimes broadly rounded. The actual extremity is very slightly indented at 

 the anal region but is otherwise evenly rounded, without any indication of anal 

 lobes. Terminal segment not demarked. The derm is at first soft and pliant, 

 but the posterior extremity soon becomes densely chitinous and finely rugose. 

 In very old examples the whole of the derm becomes more or less rigidly 



