406 Mr. R. S. BagiiiiU on new Thysanoptera. 



In lacertina the head is sliorter compared to its breadth 

 and the genal spines are fewer, shorter, and less strong than 

 in inarginata {($), whilst the third antennal joint is approxi- 

 mately as long (compared to 1'25 times as long in inarginata) 

 as the length of head behind eyes. The surface-setse of tube 

 are, on the other hand, slightly longer and stronger com- 

 pared to the breadth of the tube than in marginata. 



I have an abundant material of these interesting insects, 

 chiefly through Mr. Kelly's kindness, and hope in the near 

 future to make close descriptions of the two species. 



Family Megathripidse. 



This family will probably have to be reduced as a sub- 

 family of Idolothripidse. 



Megathrips quadrituberculatus (Bagnall) *. 



1908. Idohthrips quadrituberculatus, Bagnall, Trans. Nat. Hist. Soc. 

 Northumberland & Durham, n. s. iii. p. 210, pi. vii. fig. 9. 



A female example sent to me by Mr. Lewis in 1912 is 

 certainly the species I described as Idolothrips i-tuberculatus ; 

 the tube is present and suggests that the species is a Mega- 

 thripid. In 1915 I received a ($ Megathrips wiiich despite 

 certain colour-differences is presumably the S of the same 

 species. 



? . — Length (including tube) 5*0 mm. 



Sixth antennal joint (not described in type) with basal 

 half yellow ; 7 and 8 black. Antenna twice as long as the 

 head (which latter is very slightly produced beyond eyes) ; 

 very slender, excepting the two basal joints ; relative lengths 

 of joints 3 to 8 as follows :— 64 : 53 : 43 : 32 : 17 : 15. Joint 2 

 constricted near base and curved outwards. 



Tube long, 1*8 as long as the head, slightly curved up- 

 wards before apex ; about 6 times as long as broad near 

 base, and with tip about 0"45 as broad as at base ; sparingly 

 furnished with fine backwardly directed set?e. Bristles at 

 apex broken off. 



(J. — Length (including tube) 4*5 mm. 

 A darker specimen than the ? . Fore-tibias brown ex- 

 cepting at apex and basally ; intermediate tibiae brown except 



* In a footnote to a paper on some Japanese Thysanoptera Dr. Karny 

 mentions eight then-known species, and refers to this as Idolothrips 

 tuberculatus. I mention this error to avoid confusion, as Hood has 

 described an Idolothrips under that name from U.S.A. 



