A. D. Imms and M. a. Husain 



289 



in 25 per cent, and 50 per cent, solutions in distilled water, both alone, 

 and with the addition of certain other substances as detailed below. 



It is evident from these results that cane molasses in strong solution 

 is an extremely attractive substance. When used in 25 per cent, solution 

 its chemotropic properties are increased by the addition of beer, but in 

 these experiments the addition of the other substances quoted above had 

 no positive efiect. 



Species attracted. — 50 per cent, solution. Rhyphus punctatus Fab. 

 48(J, 21$. Onesia sepulchralis L. 15<^, 8$. Sarcophaga carnaria L. 2c^. 

 Pollenia rudis Fab. 5^, 4$. Muscina (Cyrtoneura) stabulans Fall.l(^,l$. 

 31. pabulorum Fall. 3$. Morellia Jiortorum Fall. IcJ. Pyrellia eriopthalma 

 Macq. lb*, 4$. Phormia sp. Id". Calliphora erythrocephala Mg. 3(J, 1?. 

 Mydaea meditabunda F. 2c?, 2?. M. impuncta Fall. 11 cJ. Spilogaster 

 duplicata Mg. 5(^. S. pubescens Stein. 1(?. Hydrotaea dentipes Fab. 2^, 

 2$. Hylemyia strigosa Fab. 29 cj, 13$. Polietes lardaria Fab. 5(?, 7$. 

 Hytodesia errans Mg. 1(J. Chortophila trichodactyla E-ond. 1^. Fannia 

 sp. lie?, 9$. Scatophaga stercoraria L. 2(?, 1$. Helomyza sp., Themira 

 putris L., T. minor Hal., Sepsis sp., Sciara sp., a few examples of each 

 Unidentified Diptera, mostly Anthomyidae 30. 



25 per cent, solution + 25 c.c. beer. — Rhyphus punctatus Fab. 21c?, 

 12$, 2 sex not determined. Onesia sepulchralis L. 5c?. Sarcophaga car- 

 naria L. 1(?, 1$. Pollenia rudis Fab. Ic?. Muscina stabulans Fall. Ic?, 

 1$. Calliphora erythrocephala Mg. 21(?, 12$. C. vomitoria L. 2c?, 1$. 

 Euphoria sp. 1$, Lucilia sp. 16(?, 7$. Polietes lardaria Fab. Ic?. Hyto- 

 desia errans Mg. 1$. Anthomyia pluvialis L. 1(?, 1$. Themira putris L., 

 T. minor, Sepsis sp., Sciara sp., a few examples. 



We do not regard it likely to be of much value, at present, to publish 

 the meteorological records kept in these preliminary experiments. The 

 trials were not conducted on a sufficiently extensive scale to warrant any 

 conclusions being drawn, with reference to the relations between weather 

 conditions and insect behaviour. Furthermore, owing to the war we 

 were unable to procure the necessary self-recording instruments. With- 

 out the aid of the latter, the data provided by the ordinary wet and dry 



