( 7 ) 



specimen only was seen of the form doripjms, Klug, and this 

 had the hind-wings almost entirely white — f. albinus, Lanz, 

 So far as could be estimated in the field, three-fourths of all 

 the specimens seen at Khartum were either alcijjjnis or alcip- 

 xxvi] 



poides. On the White Nile between El Duem and Gebel En 

 (lat. 14-1 2|° N.) four specimens were taken, three typical or 

 nearly so, one of the alcipinis form. These figures are in 

 marked contrast to the proportions found by the President * 

 among Mr. Loat's captures on the White Nile in lat. 11-4|° N. 

 In that case out of the same total (33), no less than twelve 

 were referred to '■'■ dorippus" (2), or ''^klugii" (10). Dr. Long- 

 staff called attention to the fact that whereas the transition 

 from the type to cdcippus, or from dorippus, Klug, to albinus, 

 Lanz., is quite gradual ; on the contrary, that from the type 

 to dorippus appears to be abrupt. 



xxxii] Wednesday, June 2nd, 1909. 



A MIGRATION OF LADYBIRDS. — Dr. G. B. LoNGSTAFF exhibited 

 a number of specimens of Coccinella 11-punctata, L., from the 

 White Nile. On February 16th, 1909, when about 40 m. above 

 Khartum, numerous lady-birds settled upon the steamer — 

 there were probably many hundreds ; they all flew from the 

 East against a slight westerly breeze ; the flight lasted from 

 4.50 p.m. till nearly 6 p.m. ; all those taken (25) proved to be 

 xxxiii] 



Coccinella 11-punctata, L., a widely-distributed species, and 

 apparently the common lady-bird of Egypt and the Sudan, 

 as Dr. Longstaff met with it near Cairo, at Aswan, at 

 Khartum, and 125 miles south of that city at El Duwem on 

 tiie White Nile. Swarms of lady-birds in England are alluded 

 to by E. C. Rye ("British Beetles," p. 228); the occurrence 

 of immense swarms of lady-birds on mountains was referred to 

 at a meeting of the Society by Prof. Poulton, quoting Prof. 

 V. L. Kellogg (Proc. Ent. Soc. Lond., 1 904, p. 23 et seq.). Kirby 

 and Spence (7th Ed., p. 295) mention having personally 

 witnessed Coccinellae alight upon a ship at sea. 



Dr. G. B. LoNGSTAFF also exhibited a >S'car«6aews taken by him 

 * Trans. Ent. Soc, Lond. 1903, p. 141. 



