BY H. L. SCHRADER. 5 



being stronger than the other. The anal setas are nearly twice 

 as long as the body ; the wings contain two longitudinal nerves. 

 The antenna3 have ten pi'inclpal joints, which are neither very 

 distinct nor regular. The eyes are prominent. The mouth, 

 (PI. I. q.) contains organs, the use of which I have not been able 

 to ascertain. 



The young larviB make their appearance in November, and 

 the perfect males in the following March. Tliis shows that the 

 females live about eight months, after being impregnated by the 

 winged males, which live only a very short time. 



PI. I. r. Shows female galls of B. pharetrata three months old, 

 and one month after what I suppose to be the period of impreg- 

 nation. 



The female larva digs into the young shoots, not so often into 

 the leaf, and changes into the pupa state ; it then becomes inactive, 

 and assumes the shape of a heart. The legs are in rather longer 

 proportion, than those of the insect in the other stages. With the 

 growth of the gall the pupa changes into the perfect female ; it is 

 at that time still very small, but lively, and grows larger and 

 larger with the gall, till it attains the full size. (PI. II. g. female 

 B. pharetrata magnified.) 



The different names of species, as pileata, pharetrata, ovicola, 

 munita, citricola, duplex, &c., I gave chiefly in relation to the 

 external appearance of the galls, as the insect itself does not 

 always show sufficiently marked distinctions, except in point of size 

 and coloui"ing, two points upon which but little dependence can be 

 placed. 



PL II. fig. a. Shows a branch of Eucalyptus hcejiiastoma with 

 several male galls and one young female gall of B. ovicola. 



PI. II. e. A longitudinal section of a full-grown gall,, showing 

 the position of the female. Fig. f. Is the female taken from it 

 (greatly magnified.) 



The male of the species ovicola is larger than that of the 

 pharetrata, stronger in the abdomen, the first 4 or 5 segments 

 being as broad as the thorax ; the others are tapered, terminating 

 with an elongated style, and two long anal setae. It is of a yellow 

 colour. 



PI. II. fig. h. Shows the female gall of B. Duplex. Fig. 1. the 



