Notes on Insects Damaging Sugar Lane in Queensland. 29 



Section D. — ^Sap-Sucking Insects. 



(31) ■' Leaf Hopper " [Tetigonia parthaon, n. sp.. Kirk.). 



(32) " Leaf Hopper " {Perkinsiella saccharicida. Kirk). 



(33) " Plant Louse " (Aphis sacchari, Zeliii.). 



(34) " Plant Louse " (Aphis adusta, Zehn.). 



(35) " Plant Louse " (Aphis sp., ? ). 



(36) " Plant Louse " Bud Aphidid. 



(37) " Snow Fly " (Aleurodes berghi. Sign.). 



(38) " Mealy Bug " (Pseudococcus (calceolariae. Mask. ? ). 



(39) Scale Insect (Ripersia ? sp. ? ). 



(31) TETIGONIA PARTHAON, n. sp.. Kirk (Family TETIGONIIDAE). 

 Plate III.. Fig. 31, p. 20. 



(32) PERKINSIELLA SACCHARICIDA, Kirk. (Family ASIRACIDAE). 



Both the al)ove species appear to be well controlled by various 

 parasitic and other enemies, and although common enough in our eane- 

 fields do not call for repressive measures. The former leaf-hopper 

 habitually freciuents the cro^\^l of the plant, hiding between the unfold- 

 ing heart leaves and not readily jumping or taking flight when disturbed. 



(33) APHIS SACCHARI, Zehn. ? (Family APHIDIDAE). 



This species may generally he found during hot weather congre- 

 gating on the under surface of cane leaves. It is plentiful at Gordonvale, 

 but apparently kept in check by several predaceous and parasitic insect 

 enemies, six of the former claas having been observed (June, 1915) on a 

 few stools of infested cane growing at the Laboratory, viz. : — 2 species 

 of Coceinellida% 2 of Hemerobida% and 2 of Syrphida^. During 

 the Spring of 1915, however, these aphides proved locally injurious to 

 plant cane that had suffered loss of vitality owing to long-continued 

 dry weather. 



Larva. 



Very pale green ; of somewhat chalky appearance. Head sometimes 

 inclined to flesh colour. 



Apterous Viviparous — Fetnalc. 

 Pale yellowish-green, with abdominal dorsal surface sometimes 

 slightly blotched with irregular markings and spots of dark brown. 

 Nectaries, tail, 6th and 7th antennal segments, and tarsi black. Eyes 

 dark red. 



Wiufjcd Viviparous — Female. 

 Head, antenmv, mesothorax, and nectaries dark brown ; pro- and 

 metathoracic segments lighter yellowish-brown. Neck and abdomen pale 

 greenish-yellow, the latter barred transversely with light brown on 



