126 L. A. MOUND 



praesternum broad. Metanotal setae far apart, not enlarged. Fore wing rather pointed 

 apically with more than sixty accessory cilia. Fore tarsi unarmed ; external surface of femora 

 angular each angle bearing a stout seta. Pelta very broad, trilobed. Posterolateral angles of 

 tergites produced, strongly in males, weakly in females. Tube hairy in basal two thirds. 



Idolothrips spectrum Haliday 



(Text-fig. 55) 



Idolothrips spectrum Haliday in Walker, 1852 : 1097. 

 Idolothrips marginata Haliday in Walker, 1852 : 1096. Syn. n. 

 Idolothrips lacertina Haliday in Walker, 1852 : 1097. Syn. n. 

 Idolothrips spectrum Haliday ; Froggatt, 1904 : 54-57. 

 Idolothrips marginatus i. invalida Priesner, 1928b : 654. 

 Idolothrips lacertinus f. infirma Priesner, 1928b : 654. 

 Idolothrips kellyanus Bagnall, 1932c : 518-519. Syn. n. 



In his original description Haliday indicated the possibility that marginata 

 represented the female and spectrum and lacertina the male. Froggatt concluded 

 from his field studies that only one species was involved and selected the name 

 spectrum. Bagnall (1916) rejected this however and recognized two species under 

 the names marginata and lacertina, and separated them on the form of the male 

 lateral abdominal tubercles. Priesner further distinguished these forms on the 

 ratio of head length to width. The present author has examined many specimens 

 from Australia and these two forms are to be found in the same population. The 

 male tubercles and setae sometimes do not correspond on opposite sides of the body 

 (Text-fig. 55) and the variation is correlated with body size. The colour of the stem 

 of antennal VI varies from yellow to brown in the material examined, and so 

 kellyanus is here interpreted as a small female of spectrum. 



Holotype $ of kellyanus. South Australia : Lyrup, nr. Renmark, River 

 Murray, dead leaves of Eucalyptus melliodora (R. Kelly). 



ISOPTEROTHRIPS Bagnall 



Isopterothrips Bagnall, ig26d : 553. Type-species /. tenuipennis, by monotypy. 



This genus is very close to Diceratothrips, but may be distinguished by the narrow 

 base of the long tarsal tooth, the pelta with very slender lateral lobes, and antennal 

 IV with only three sense cones. The fore coxae bear six or more short stout setae 

 on the posterior margin, and in the male there is in addition a group of about five 

 setae directed anterolaterally. 



Isopterothrips tenuipennis Bagnall 



(Text-figs. 56-58 & 73) 



Isopterothrips tenuipennis Bagnall, ig26d : 554. 

 Dichaetothrips penicillatus Priesner, 1937b : 626-629. Syn. n. 



The fore wings are colourless in this species and the tube is sculptured. The postocellar 

 setae are about as long as one side of the ocellar triangle, but the posterior dronotal setae are 



