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Jun 7 Oryctes nasicornis ♂ last ab. segment, much less hairy than in ♀ ??; There is no doubt about Hairs when held in certain position in ♀ all covered but the ridge about = in both sexes & ridges not so well developed as in O. senegalensis

Both sexes make noise Lines finer & more continuous in ♂

My English Copris no organ on Back

Copris cantharis do do

Phanæus carnifex do do

Lucanus cervus do

♂ My Typhœus do

Geotrupes stercorarius do

Trox sabulosus no dorsal or coxal organ - The only way I could & did make a grating noise was by rubbing spinous tibiæ, specially of middle legs, against thickened edge of elytra, which is furnished with points. But Erichson says it is by rubbing under side of body against elytra.

Onitis no dorsal organ

Lethrus ?? too hard to make out

Bubas bison no dorsal organ

Bolbocerus farctus. do do do

(over)

 

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In Oryctes senegalensis, there is certainly some difference between sexes - the ridges on ♂ are plainer & destitute of hairs in middle part, whilst in ♀ whole surface is hairy - But I can make noise with ♀.

The edge of elytra in corresponding part is in ♂ destitute of hairs in ♀ hairy But then comes doubt whether not an individual variation.

Aug 20 In the female on last segment abdominal segment, before the end plate, the segment is marked with short crest, bearing good sized spines - in ♂ at apex margin shrunken not very different, but short mature size more separate, but more posteriorly which surface is marked - covered with very fine lines, which can be rubbed on by elytra - The difference, especially when viewed as transparent object, is most conspicuous.

3/4 of surface in ♂ covered with fine ridge - as ♀ whole surface covered with short [spines] irregular crests or ridges.