June, 1922 bionomics of alphelinus semiflavus 



221 



records with which the writer is familiar date from Howard 

 ('08), where he quotes Dr. Marchal's observations on this habit 

 in the parasite TetrasHchus xanthomelcBfice Rond, on the eggs of 

 the elm leaf beetle Galerucella luteola. Later Howard ('10) in 

 a more general article on this habit among the Chalcidoidea, 

 again refers to Marchal's observations on TetrasHchus, in addi- 

 tion to some similar observations on Aphelinus mytilaspidis in 

 Aspidiotiis ostrecBJormis, along with several others; namely, 

 Dr. H. T. Fernald on TetrasHchus asparagi, feeding on the eggs 



*vtfa"l'i-?Vl''5"t-gi r' g'l '9\lo\h'Uk\l3 \MU 9\»-l7^ls\k^'l^^ 



LdXPerfodaf 17 dags 

 Av'er'age. per vlght 6 



" 24 hrs. 153 __ 

 Total egijs prDduc€d _ 256 ^ 



m Period. cfZC days 

 A'/eragz pgr mght 62 z 

 ■ -____. "_ day... lg.Z ^ 



VThtd^ ggg^tpf-c^fjifad 507. _ 



^miA. 



I3:,:i££aLiL 



J__FM£^ 



Fig. 1. Number of eggs deposited by a single Aphelinus semiflavus per day and 

 night for a given period. Black equals night, cross lines equals day; large squares 

 on abscissa equal 24 hours; small squares on ordinate equals one egg; "x" equals 

 point where natural death occurred. 



of the asparagus beetle {Crioceris asparagi), and Mr. J. G. 

 Sanders concerning Aphelinus fuscipennis on Aspidiotiis rapax. 

 Mr. H. J. Quayle ('10) also refers to a similar habit as occurring 

 rarely in ApheUnus diaspidis, parasite of the red or orange 

 scale {ChrysomphaJus aurantii) in California. He also observed 

 this species to feed on honey dew, plant juices, and fruit. Mr. 

 L. P. Rockwood ('17) published for the first time observations 

 on this habit in ApheUnus lapisligni How., feeding at the 



