492 Mr. T. D. A. Cockeiell — Descriptions and 



the others, except that thei'e is a subapical, round, 

 suffused, black spot, the hiud margin in middle 

 straight, neither excavated nor depressed ; last 

 segment with a round shining depression, in which 

 is a strong carina. Twenty-three specimens. 

 Takao, March, April, August, October ; Koroton, 

 Sept. 8, 1907. 



Two other forms come from the Asiatic mainland : — 



(4) A. caldiveUi, nov. Face-markings pale yellow as in 



korotonensis, but marks at sides of clypeus large 

 and notched below, shaped entirely as in calceifera ; 

 hind basitarsus with some white hair, especially at 

 base ; fifth ventral segment black, except for the 

 tuft of white hair on each side, its margin broadly 

 shallowly excavated ; abdominal bands light blue. 

 Foochow, China {H. R. Caldwell). U.S. National 

 Museum. I have erroneously determined this as 

 A. zonata. 



(5) A. subccerulea, Lepeletier. Face-markings very pale 



yellow ; clypeus with very large quadrate black 

 patches as in the female ; hind basitarsus without 

 white hair ; fifth ventral segment with hind margin 

 straight. Kalutara, Ceylon, March 1910, 2 ? , 1 cJ 

 (E. Comber) ; Nasik, India, Sept. 1908 {E. Comber). 

 British Museum. 



I suppose that this is Lepeletier's subcarulea, 

 as he describes the sexes as having the face- 

 markings alike. The female agrees well with the 

 desciiptioD, except that the antennae are red 

 beneath from the end of the third segment, and 

 the fifth abdominal segment has black hair in the 

 middle and white at the sides (instead of the two 

 intei-mixed). The abdominal bands are pale blue, 

 as in caldwelli. 



From the standpoint of genetics the above insects are 

 extremely interesting. The differences may be regarded as 

 plus and minus variations, corresponding probably to 

 Mendelian allelomorphic pairs, as follows : — 



(1) Face-markings yelloAV ( + ) or white (— ). 



(2) Marks at sides of clypeus like female ( + )j or boot- 



like (first reduction stage) or narrow bands (second 

 reduction stage) . 



(3) Hind basitarsus with hair all black ( + ) or partly 



white ( — ). 



(4) Fifth ventral segment entire ( + ) or emarginate ( — ). 



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