404 Mr. E. S. Bagnall on neto Thysanoptera. 



Zimm., but compared witli specimens of the latter in my 

 collection [ex et teste Karny), gracilis is larger and has the 

 tube very noticeably longer, about 0*5 as long again as in 

 elegans (18 : 12) ; viz., in gracilis about as long as the 

 abdominal segments 7-8 together, and in elegans about 0*75 

 the length of those segments. 



Genus Elaphrothrips, BufFa. 



Jdolothn'ps, Hinds, Bapnall, and others. 

 Elaphrothrips, BuU'a, liedia, v. p. W2 (1909). 



Genus Tdolothrips, Haliday. 



Idolothrips, Fro{?gatt, Troc. Linn. Soc. N.S.W. 1904, pt. 1. 

 Acanthinothrijjs, Bagnall, Trans. Nat. Hist. Soc. Northumberland & 

 Durham, n. s. iii. p. 207 (1008) (and others). 



Mr. Froggatt is undoubtedly right in assigning Idolothrips 

 marginata and spectrum as ? and (^ of the one species, and 

 1 ^Yithdraw' anything I may have written in 1908 on that 

 point. I do not agree with him, however, in that /. lacertina, 

 Hal., is a "smaller and more variable form of the cj" 

 {spectrum). Regarding the female viargiiiata as the geno- 

 type of Idolothrips^ I erected the genus Acanthinothrips for 

 the strongly characterized species spectrum, but being sexes 

 of one species they must be placed in the genus Idolothrips, 

 and the Idolothrips of most modern authors must be known 

 as Elaphrothrips. The females of the two genera are very 

 much alike. 



Idolothrips marginata, IIalida3\ 



1852. Idolothrips marginata, Haliday in Walker, Homopt. Ins. Brit. 



Mus. p. 1096. 

 1852. Idolothrips spectrum, Haliday in Walker, Homopt. Ins. Brit. 



Mus. p. 1097. 

 1904. Idolothrips spectrum, Froggatt (with marginata ( 9 ) aiid lacei'- 



tina as synonyms), Proc. Linn. Soc. N.S.W. pt. 1, p. 54. 



I. marginata, being the first used, would seem to be the 

 name by which this species should be known. 



Idolothrips lacertinay Haliday. 



1852. Idolothrips lacertina, Haliday, /. c. p. 1097. 



1904. Idolothrips spectrum (in part), Froggatt, /. c. pt. 1, p. 54. 



The <^, apart from being noticeably much smaller and 

 more slender than the S of marginata, widely and constantly 



