40O Dactylopiinc^.. 



{Tetnostachywn attenuatiim) {fig. i). The colonies are almost invariably 

 attended by ants {Cremastogaster dohrni) which construct fibrous shelters over 

 them. The position and globular form of the insects gives them the appearance 

 of sessile berries growing upon the plant. 



Though differing widely, in form and colouring, from typical species of 

 Antonina, all the structural characters of the insect, and its early development, 

 point to its position in this genus. 



Genus LACHNODIUS, Maskell. 



Lachnodius, Mask., N.Z. Trans., Vol. XXVIII. p. 400 (1896). 



This genus was erected by Maskell to contain species differing ixoxa.Ps6udo- 

 coccus in having more than eight setae on the anal ring. That author gives, as 

 one of the characters of his genus, ' Antennas of seven or eight joints, of which 

 the last is not longer than the others.' This definition would limit it to the 

 Australian species, of which three have been recorded. I am now including a 

 species from Ceylon that differs from the typical species in having the terminal 

 antennal joint elongated and longer than the others. Monsieur Vayssiere has 

 recently described a species (Z. greeni)., with similar antennal characters from 

 Madagascar. It is doubtful, however, if these two insects from Ceylon and 

 Madagascar are strictly congeneric with Lachnodius eucalypti (the type 

 species). 



LACHNODIUS HUMBOLDTI^, nov. 

 (Plate CLXIX.) 



Adult female {figs, i, 2) at first pinkish yellow, afterwards purplish grey ; 

 slightly pruinose ; circular or broadly oval ; strongly convex above. Segments 

 demarked by deep transverse furrows. Antenna {figs. 3, 4, 5) six- or seven- 

 jointed, in almost equal proportions. The six-jointed form may have the third 

 joint comparatively short as in fig. 3, or very long, with a partial division, as 

 shown at fig. 4. In the seven-jointed form, which is probably the normal one, 

 the terminal joint is the longest, and the fifth shortest. The antenna is but 

 sparsely hairy. Legs rather stout, though comparative small ; tarsus slightly 

 shorter than tibia, the two together markedly shorter than the femur {fig. 6) ; 

 very sparsely spiny. Anal ring {fig. 8) with from twenty-four to forty stout 

 setEe. The posterior extremity {fig. 7) bears two rounded cushion-like promi- 

 nences, with a few small conical spines. The derm of the dorsum bears numerous 

 similar spines intermingled with small ceriferous pores, the latter obscurely 

 triloculate {fig. 9). Length of body varying from 1*50 to 2'5o mm. 



