( xxxii ) 



The various pairings give the following results : — 



(1) lacticolor 9 x grossulariata ^ gives all offspring grossu- 

 lariata. 



(2) Heterozygous grossulariata $ and $ paired together give 

 all (Js grossulariata, 5s half grossulariata, half lacticolor. 



(3) lacticolor $ x heterozygous grossulariata $ gives equal 

 proportions of grossulariata and lacticolor in both sexes. The 

 variety is thus transferred to the male by this pairing. 



(4) The converse pairing heterozygous grossulariata ? x 

 lacticolor $ gives all ^s grossulariata, all ^s lacticolor. 



(5) lacticolor $ x lacticolor $ gives only lacticolor in both 

 sexes. 



(6) Wild $ X lacticolor $ gives all (^s grossulariata, all 

 5s lacticolor. 



These results show — (1) that lacticolor is a Mendelian 

 recessive to grossulariata; (2) the converse pairings Nos, 

 1 and 6 above, show that wild ^s, are homozygous (pure) 

 grossulariata; but wild 5s are heterozygous, bearing reces- 

 sive lacticolor. They suggest that the sex-determinants also 

 behave as Mendelian characters, femaleness being dominant, 

 and that $s are homozygous in respect of sex, 5s heterozygous. 



New Irish Beetle. — Mr. J. R. le B. Tomlin exhibited 

 examples of Micropeplus caelatus, Er., taken on marshy ground 

 last April, near Cloghane, co. Kerry, by Dr. Norman Joy 

 and himself, an interesting addition to a small genus, so far, 

 reported only from Germany and Sweden. It comes nearest 

 to M. porcatus, Payk., from which it is very distinct by its 

 much smaller size, the much feebler raised line on the vertex 

 of the head, the much more rugose sculpture of the head and 

 thorax, and in other points. It has the proportions of 3T. 

 tesserula, Curtis, but is larger and has the interstices of the 

 elytra strongly punctured. 



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

 a number of specimens of Goccinella ll-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 



