1894.] 



201 



Ttpe— c? ?. Mus. Wlsm. 



Hal. : Cambridge. YIe — Yllm. 



Mr. William Parren met with this species at the end of June, 

 1893, and during the first two weeks of July in the present year, by 

 sweeping herbage near Cambridge. Its superficial resemblance to 

 some of the obscurely marked forms of Elachista may easily account 

 for its having so long escaped the notice of collectors. I am indebted 

 to Mr. Farren for kindly supplying me with specimens and permitting 

 me to describe them. 



The species hitherto placed in the genus Heydenia appear to be 

 attached to various TImhelliferce, the larvsD feeding among the seeds 

 of ^gopodium, Pimpinella, Laserpitium, Angelica, and Seracleum : 

 search should be made for that of Cataplectica Farreni under similar 

 conditions. 



2. profugella, Stn. 5. statariella, Hdn. 



3. auromaculata, Frey. 6. laserpitiella, Pfaffz. 



4. fulviguitella, Z. 7. silerinella, Z. 



II. — Veins 7 and 8 of the fore-toings separate. 



HEYDENIA, Hfm. 

 1. devotella, Hdn. 



Merton Hall, Thetford : 

 July, 1894. 



A COMPAKISON OF MOTH-GEEASE SOLVENTS. 

 BY H. GUAED KNAGGS, M.D., F.L.S. 



Some time ago, whilst experimenting with moth-grease extracted 

 by means of pure ether, I arrived at the following approximate results 

 respecting the solving and evaporating properties of the under- 

 mentioned fluids : — 



At about 55" F., 2 grains of moth-grease were 

 dissolved in 40 minims. 



At about 60° F., 25 minims poured on to 

 a plate evaporated. 



Methylated chloroform... s. g.l"497 



Methylated ether s. g. 717 



Benzine-collas s. g. '850 



Pure ether s. g. 720 



Petroleum other s. g. "625 



1 minute 

 3 minutes 

 4^ minutes 

 6 minutes 

 6^ minutes 



Methylated ether 



under 1 minute 

 over 1 minute 

 over 1 minute 

 1\ minutes 

 35 minutes 



Pure ether 



Petroleum ether 



Methylated chloroform... 

 Benzine-collas 





Rectified turpentine, kerosine, bisulphide of carbon, &c., have 

 not been included, for the reason that the two former are themselves 



