8-pecies of Tetracha. 353 



reduced in size until near the apex, where they become 

 obsolete; the usual subapical line of pits well defined. 

 Thorax wholly golden-green, with blue and purple re- 

 flections on the disc and sides. Head the same in colour. 

 The abdomen has the basal segments green, the apical 

 segment yellow at the tip, pitchy at the base, the second, 

 third, and fourth from the apex, pitchy, the last mentioned 

 green at the sides. Legs: thighs chesnut brown; tibiae 

 and tarsi obscure yellow, with the tips of all the joints 

 stained with brown. Antennge yellow. Jaws long and 

 powerful, yellow; teeth black. 



I may remark that all the Australian species of Tetra- 

 cJia have a peculiar fades, which at once distinguishes 

 them from the species from America. They are broader, 

 and more robust insects ; and they all possess a well de- 

 fined longitudinal subsutural line of pits, situate at about 

 one-fourth of the width of the elytron from the suture, 

 curving outwardly as it approaches the apex. This line 

 of pits does not exist at all in those American species 

 which I possess, or if there be any trace of it, it is only 

 in very close proximity to the suture. The Old World 

 species T. quadrisignata and eiiphratica, both possess the 

 line of pits above mentioned, and they further agree in 

 shape with their Australian relations. Sooner or later the 

 Old World species must be arranged in a genus by them- 

 selves, throwing T. Boccandei into the genus Megacephala, 

 to which it more properly belongs. The generic limits 

 will then accord with geographical habitats, as ought 

 always to be the case where nature will permit. 



2 D 



