44 A. REIJNE, A COCOONSPINNING THRIPS. 



Pupa (15 hours before it was still larva) with wingcases 

 alread)' at the end of the red band, antennae at the 

 end of the first abdominal segment (fig. 2). Colour of 

 abdomen behind the band reddish, thorax orange. Third 

 day : Hind-margin of the red band scarcely more visible. 

 Wingcases and antennae the same. Fifth da\' : Adult, 

 but deformed, 



II) First day : Larva dull. Second day : Pupa. Wing-cases 

 reaching 2"*^ abdominal segment. Third day : Abdominal 

 band much paler, the other abdominal segments reddish. 

 Wingcases reaching last segment of the band, antennae 

 almost equally far. Fourth day: The same, but colour 

 darker, especially of last four segments. These were still 

 darker on the fifth da}'. Sixth day : Pupa died. 



In the breeding-experiments the larvae often died. The)' 

 were found entangled in a ver\' stick)', almost solid, drop, 

 apparently vomited by the insect itself. This phenomenon 

 was never observed in HcliotJirips ruh^ocinctus GlARD or 

 H. iiacmorrhoidalis BOUCHÉ, though the)' were bred as long 

 as a year. Whether this is due to a particular disease, or 

 has some relation to the fluid used for spinning, was not 

 determined. 



Paramaribo, Oct. 191 8. 



P. S. Afterwards I see from a review of a russian publication, 

 that N. V. KURDJUMOV in 191 3 observed the spinning of a 

 cocoon in Aeolothrips fasciatiis. Probably other Aeolothripidae 

 will do the same. The following note is given (Review of 

 applied Entomology IV A (1916) p. 166): "The larvae of 

 A. fasciatus were observed to weave a cocoon, which had 

 not previously been recorded in the case of thrips, inside 

 which they pass the stages of pronymph and nymph. The 

 duration of the pron)'mphal and nymphal stages are equal, a fact 

 which distinguishes these insects from other Thysanoptera". 



EXPLANATION OF PLATE i. 



All figures were drawn with a camera lucida (except fig. 4), 

 I — 2 after specimens freshly killed in alcohol, 3 — 6 after 



