E. R. Speyer 139 



of the Genus Culex (though oil of citronella is strongly repulsive to these), 

 and Lepidoptera of the families Noctuidae and Geometridae. 



A single Stomoxys calcitrans Linn, was found in oil of juniper berries, 

 and one Calliphora irridescens Des. 



Citronella oil has already been mentioned as attracting two species 

 of Dacus, and oil of bitter almonds attracts species of Thrips (Howlett) 1 . 



On September 23rd, the traps baited with orange oil and grape juice 

 contained 3 dead male flies and 1 dead female out of a total of 12 males 

 and 9 females. 



On September 24th 4 flies were floating in lemon oil used in con- 

 junction with grape juice out of a total of 251 males and 240 females. 



In both instances these may have fallen into the oil dishes by accident 

 after feeding heavily on the grape juice. 



SECTION IV. 



RECORD OF OTHER INSECTS OBSERVED DURING 

 THE EXPERIMENTS. 



The following table gives a record of Diptera attracted to substances 

 used in the various experiments of Sections II and III, but it must be 

 remembered that the traps employed were not suitable for the collection 

 of many of the smaller species, of which a considerable number must 

 have escaj)ed. 



The various re-agents are designated by letters, as below: 



A, Amyl alcohol; B, Amyl acetate; C, Valerianic aldehyde; D, Valerianic acid; 

 E, Cinnamic aldehyde; F, Cinnamic acid in ethyl alcohol; G, Oil of bitter almonds; H, Oil 

 of juniper berries; I, Grape juice; J, Banana; K, Brown sugar. The numerals represent 

 the number of insects attracted to that particular bait. 



Muscina stabulans Fall. El, F 3, I 10, J 3: total 17. Sarcophaga assidua Walk. D 3, 

 I 15, J 1: total 19. Sarcopfiaga helicis Town. B 1, I 1: total 2. Fannia canicularis Linn. 

 A 3, D 1, F 1, G 1, I 3, J 7: total 16. Drosophila ampelophila Loew. A 1, B 2, I 2: total 5. 

 Stomoxys calcitrans Linn. A 2, HI: total 3. Calliphora irridescens Des. G 1. Calliphora 

 erythrocephala Meig. I 2. Lucilia caesar Linn. I 2. Lucilia sericata Meig. I 1. Phormia 

 regina Meig. II. Phorbia fusciceps Leff. D 1. Limosina sp. B 2. Borboridae A 4, D2: 

 total 6. Spilogaster sp. K 1. Chironomus sp. B 1. BoetechenialatisternaPsick.il. Cynomia 

 cadaverina Des. J 1. 



It is noticeable that only one fly, Fannia canicularis Linn., was 

 attracted to a substance containing the benzene ring as well as to 

 substances containing the CH 3 .CH 2 group, and, in the case of the 

 former, only one fly was found in each trap. On the other hand, Muscina 

 stabulans Fall, occurred only in substances containing the benzene ring. 



1 Journal of Economic Biology, Vol. IX, No. 1, pp. 21-23. 



