8 



Mytilaspis, but examination of the enclosed pupa shows it to be 

 undoubtedly a Psyllid. 



Genus Trioza, Forster. 



Head produced in two conical processes ; stalk of the cubitus 

 in forewing entirely wanting. 



Trioza multitudinea, Tepper. Pi. hi., figs. 11-17. 



ASCeliS (?) multitudinea, Tepper, Trans. Roy. Soc. South Australia, 

 1893. Figs. 15-21. 



Insects forming large galls on leaves, in the pupal stage. These 

 galls, in the fresh state, have a greenish colour, but when quite 

 mature or old they become red, or reddish-yellow; the normal 

 form is subglobular ; rarely, specimens are slender and cylindri- 

 cal ; the outer surface is rough and wrinkled ; the texture is soft 

 and leathery. Each gall usually contains a single cavity — some- 

 times there are two or three cavities ; the interior walls are 

 always quite smooth. The gall is attached to the leaf by a narrow 

 base, and on the other side of the leaf there is usually a depres- 

 sion, but this is not entirely constant. The galls vary in size 

 from a diameter of 3 mm. = |^ inch, to 12 or more mm. And I 

 have seen a few almost 1 inch. 



Within the galls are found the pupae, which when alive have 

 dorsally a palish-browr colour, banded with faint yellow bars ; 

 dead specimens are dark-brown, and the bands almost obsolete ; 

 ventrally the colour is pale yellow, the feet and antennae the 

 same. Dorsally the wing-covers are plainly visible, also the eyes, 

 which in fresh specimens are bluish. The margin of the pupa all 

 round bears a fringe of short yellow hairs. The general form is 

 elliptical, with a length of about 2 mm. = yV inch. There is no 

 special character in the antennae and feet, which indeed do not 

 vary greatly in the genus Trioza. 



The larva has not been observed. 



The adult female is almost entirely yellow, with a darker tinge 

 on the thorax, dorsally, and at the extremities of the antennae 

 and feet ; the eyes are red, semi-globular, facetted, placed on a 

 short tubercular base. The head is broader than long, depressed 

 in front and produced beneath in two moderately long sub-conical 

 processes; the rostrum is cylindro-conical. The antennae have 

 10 joints, all elongated, sub-equal and ringed, except the two first, 

 which are short and smooth ; on the last joint are two short sub- 

 equal spines. Feet normal, with dimerous tarsi and double claws. 

 The genitalia of the female (fig. 19) consist of two longish, 

 sharply-pointed processes enclosing the ovipositor ; one of these 

 is rather shorter than the other ; both are numerously ringed, the 



