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The color of what I've seen here matches exactly that of wild howler monkey excrements. With those living cells inside it, would it be possible these are dried dung drops with fungi living in/off them? 

   

 On Friday, 13 October 2017, 16:43, Bruce Gill <[log in to unmask]> wrote:
 

 Now I'm very interested in learning what these "plaques" are, as shown in DSCN3724.  I've observed them on numerous genera of Scarabaeine dung beetles from the Neotropics and elsewhere. At an Ent. Soc. of America symposium on Insect-Fungus relationships some 20+ years ago, the speaker showed images of very similar structures on the pronota and elytra of beetles and said they were Laboulbeniales.  If these are not labouls, then perhaps they are another group of fungi.Bruce   On 2017-10-12 17:06, Mikhail F. Bagaturov wrote:
Than it shall be an integument defects.

All the best, Mik



Четверг, 12 октября 2017, 23:41 +03:00 от Alberto Ballerio <[log in to unmask]>:

I sent the photo of the Onthophagus taurus 
 specimen to Prof. Walter Rossi, an authority on 
 Laboulbeniales and he told me that the mistery 
 spots do not belong to the order Laboulbeniales.
 Best regards,
 Alberto



 At 18:08 12/10/2017, you wrote:
 >These look very typical Laboulbeniales. Some of 
 >the other blotches look less distinctive! Best wishes, Robert.
 >
 >From: Scarab Beetle Taxonomy Discussion List 
 >[mailto:[log in to unmask]] On Behalf Of Angel Solis
 >Sent: 12 October 2017 16:45
 >To: [log in to unmask]
 >Subject: Re: Query RE: mysterious yellow spots on Onthophagus taurus
 >
 >Hola:
 >
 >I have seen here in Costa Rica many cases like 
 >the one Kevin shows in his photo, we also have 
 >clear cases of Laboulbeniomycetes like those 
 >shown in my photo on a Dichotomius centralis. 
 >However the ones in Kevin's photo look different from those in my photo:
 >
 >Saludos
 >Ãngel Solís
 >
 >
 >
 >

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 Dr. Alberto Ballerio
 Viale Venezia 45
 I-25123 Brescia
 ITALY
 tel.:0039-030364183
 fax.:0039-030224923
 e-mail: [log in to unmask]
http://museum.unl.edu/research/entomology/workers/ABallerio.htm


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=====
All the best, Dr. Mikhail F. Bagaturov

IUCN/SSC Amphibian SG and Conservation Planning SG, 
Academic Member of Athens Institute For Education & Research (http://atiner.gr)

Author of Theraphosids of the World: http://tarantulas.tropica.ru