350 



It will thus be seen that Megalothrips honannii Uzel bas very 

 little in common with the genus Idolothrips, that, in fact, it belongs 

 to a différent group altogetber, and I would propose that the genus 

 Megalothrips Uzel should not be sunk as a synonym of Megathrips 

 Targ.-Tozz., but be retained for the réception of this species. 



In the same paper Dr. Buffa (5) describes the two very interest- 

 ing gênera, Bacillothr/ps and Siphonothrips, both of which are very 

 closely alhed to Megathrips and Megalothrips. Prof. Reuter (10) 

 describes Megalothrips longiceps, from Gorfu ; and as I hâve already 

 stated this paper has escaped Dr Buffa 's attention as well as by own. 



Bacillothrips is especially interesting on account of the form of 

 the first abdominal tergite, whicli is composed of three semicircular, 

 chitinous plates, the central one being the largest. Buffa only 

 describes apterous forins of the single species, B. Unearis Buffa; 

 the ocelli are présent, however, and it is quite likely that winged 

 forms will ultimately be found. 



Thèse four gênera, Megathrips Targ.-Tozz., Megalothrips (Uzel)- 

 as exemplified by M. Bonannii Uzel, Bacillothrips Buffa, and 

 Siphonothrips Buffa, in fact form a natural group at once distin- 

 guishedby the unarmedfore-tarsus in both sexes; the latéral tubiform 

 processes of the sixth abdominal segment in the çf, and the long 

 tube of the Ç. The species range in size from three to four milli- 

 mètres, the antennse bave the intermediate segments elongate, the 

 head is two to three times longer than broad, or than the length of 

 the prothorax, whiist the tube of the Ç is decidedly, sometimes 

 considerably, longer than that of the ç^. The gênera may be thus 

 provisionally tabulated : — 



I. Ttibiform processes of &h abdominal segment reaching beyond apex of Itli seg- 

 ment; outwardly curved : 



i. Prothorax strougly trausverse : 



O • 5th abdomiual segment broadeued at apical thiril aud sharply 



coustricted to base of 6th; 8th segmeut simple ; 

 Ç. Tube six times the length of 9th abdomiual segment; auteuute 

 longer than head and prothorax together. 



Megalothrips (Uzel). 

 ii. Prothorax not stx'ougly transverse : 



O . 5th abdominal segment not broadeued ; 8th segment with a pair 



ot latéral projections; 

 Ç. Tube four times the length of'Jth abdomiual segment; anteuuee 

 as long as the head and prothorax together. 



Mega th rips (Ta kg . -Tozz ) . 

 II. Tubiform processes of 6th abdominal segment scarcely reaching to apex of 

 Ith segment; inwardly curved : 



i. Form very narrow, linear; prothorax not strongly transvere; head 

 three times the length of prothorax : 



Q . Autenuse longer than head ; tubiform processes of 6th abdomiual 

 segment almost parallel; segments 7 aud 8 longer than broad, 



