[27]

Sept. 7. 68. Geotrupes stercorarius. Down Field.

In 2 spec. male & female

Breadth of strid. in ♂ ridge in 2 spec. in widest part 30 & 33 divisions of M.

do in ♀ do. do do 23 & 23

In a dead pair (but injured) I could remark most easily make noise with ♂. No equally early with [illeg]

In a living pair, when held by hind legs close by ear. ♂ stridulated willy-nilly & rapidly ♀ only slightly & occasionally.

Frank, same result. [illeg] }

George do} They not knowing which was male & female.

(Frank took 7 spec. dead & with naked eye classed all rightly into males & females by breadth of file) Frank judges partly by prominence of rasp, & [illeg] as transparent object, the rasp of ♂ certainly more obscure & brown.)

 

(I examined under [illeg] mirror at another pair of rasp. of Geotrupes that of male a little larger & less transparent & the broader in proportion as 33 to 21 or 22 divisions of micrometer)

(Frank prepared rasps of male and female Typhœus, that of male perhaps a little broader, size as 18 to 16 in female (very little difference); & more obscure or less transparent; but the whole tissue of coxa less transparent & browner.)

over

[27v]

Sept. 7. 68. Necrophorus Eng. Sp. - Strid. file equal in 2 individuals, supposed he now doubts by Frank to be 2 sexes. - on dorsal surface of 5th segment of abdomen. - very neat (on [illeg] segment are like of Dynastidæ?) [sketch] ridge on elytra.