1881.] 



evapometer, for remote and secluded stations. 



85 



Comparative table of the rainfall at Alipore observatory, as measured daily 

 in a 5-inch gauge, and monthly in an 8-i?ich gauge with evapometer. 



Month. 



Actual Measurement, 

 Monthly. 



Evapo- 

 meter. 



Gauge. 



April 



May 



June 



July 



August 



September 



October 



November 



December 



January 



Total 



Inches. 



308 

 337 

 3-68 

 3-58 

 3-74 

 363 

 3-70 

 362 

 3 61 

 364 



Inches. 



§■91 



8-90 

 1870 

 1703 

 17-18 

 16-95 



8-97 



3-96 



405 



390 



Differ. 



Inches. 



2-83 



5-53 



15-02 



13 45 



13 44 



13-32 



'5-27 



0-34 



0-44 



0-26 



&% 



'S a 

 •^ '3 



<D £ 



CD 



£ CD 



o a 



Inches. 



2-88 



5-63 



15-31 



13-71 



13-70 



13-57 



5-37 



0-35 



0-45 



0-26 



71-23 



& CD 



y. a 



* S3 



+-i 33 



o <v 



Inches. 



2-01 



4-88 



14 78 



1346 



13-33 



1317 



511 



02 



0-15 



66 91 



rd JD 



a a 



O CO 



a g 

 *« a . 



s^a 



Inches. 



+ 0-87 

 + 0-75 

 + 0-53 

 + 25 

 + 037 

 + 0-40 

 + 0-26 

 + 0-33 

 + 030 

 + 026 



4-32 



The quantity shown by the new gauge is therefore constantly in 

 excess ; and there can be little doubt that this is owing to the evaporation 

 from the evapometer being greater them from the gauge. Nevertheless 

 for a rough measurement of the rainfall, in the rainy season, the instru- 

 ment may serve fairly enough ; and I think that one or two slight alterations 

 may very much improve its working. 



It is not difficult to decrease the evaporation in the evapometer by 

 increasing the size of the outer cone, and a few trials will show what 

 dimensions give the best result. 



VIII. — On some Lepidopterous Insects belonging to the Rhopalocerom 

 Genera Euripus and Penthema from India and Burmah. — By J. 

 Wood-Mason, Deputy Superintendent, Indian Museum, Calcutta. 



[Received 5th February ;— Read 6th April, 1881.] 

 (With Plates III & IV.) 

 1. Euripus consimilis. PL IV, Fig. 3. 

 Diadema {Eestina) consimilis, Westwood, Gen. Diurn. Lep., vol. ii, p. 281, note, ? . 

 A fine specimen of the female of this striking species taken in the 

 autumn of the past year in the Thoungyeen forests, British Burmah, by 

 12 



