198 THE ENTOMOLOGIST. 
areolets. The Asilide generally, including Laphria and 
Dasypogon, are distinguished by the completeness of their 
wing-structure, by their powerful flight, by their robust 
bodies, by their thirst for blood, and by their lancet-like 
mouths, from which the wing-case of beetles is not always 
a sufficient defence: they chiefly abound in hot regions, 
where they help to maintain the balance of life, by limiting 
its excess in some forms. The radial areolet is open in 
Dasypogon, closed in Laphria and in Asilus; in the first 
genus the radial and subcostal bones are separate, in the 
second and third they are united before they reach the 
border. The resemblance between the wing of Rhyphus and 
that of Leptis has been already remarked: in the former 
there are two radial areolets, one cubital areolet, and the anal 
areolet is open to the border; in the latter there are one 
radial areolet, two cubital areolets, and the anal areolet is 
closed before the border. 
Francis WALKER. 
Occurrence of Butterflies at Dry Drayton, in the Months of 
March, April, May, June, 1874. By the Rev. F. A. 
WaLker, M.A. 
1. Pieris Brassice.—April 7, 23, 25, 27, 28, 29; May 17, 
18, 21, 31; June 1, 2, 3, 4, 5, 6, 7, 21, 27. Observed on 
nineteen different days in April, May, June. 
2. P. Rape.—April 20, 21, 22, 23, 24, 25, 26, 27, 28; 
May 2, 8, 18, 21, 22, 24, 31; June 2, 4, 5, 6, 7, 21,27. Ob- 
served on twenty-three different days in April, May, June. 
3. P. Napi.—April -25, 27, 28, 29; May 1, 5, 6, 17, 
18, 29; June 5, 9. Observed on twelve different days in 
April, May, June. 
4. Anthocharis Cardamines.—April 29; May 16, 18, 21, 
22, 24, 26, 30, 31; June 2,3,9. Observed on twelve different 
days in April, May, June. 
Total number of appearances of Pieride, sixty-six. 
5. Gonepteryx Rhamni.—Male: March 18, 23, 24, 28; 
April 3, 20, 21, 22, 27, 28; June 5(?). Observed on ten 
different days in March and April, one in June; but my eyes 
might have deceived me concerning this last appearance, 
