Argentine officers c. 1915 on my web page

New on my web page, a couple of new photos of Argentine officers from what I estimate to be c. 1915. Link: ArgentineOfficers.

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I haven't found anything with any great detail regarding officer shoulder bars/tabs.
The officer seated end left appears to have tabs not unlike the Japanese officers of the period while the other officers are more akin to the American shoulder bars/tabs.
The Japanese type shoulder bars I thought may be a uniform variation but I'm unable to tell if there are any differences between them, could this be for some form of Adjutant, Aspirant/Fahnrich grade?
Regards
WF

Here are a few links that may interest to anyone who hasn't come across them before,

http://translate.google.co.uk/translate?hl=en&sl=es&u=http://www.fullaventura.com/elrincon/nota115115.php&ei=Zlv-TM6sG8eIhQe3sPy2Cw&sa=X&oi=translate&ct=result&resnum=3&ved=0CDEQ7gEwAjgK&prev=/search%3Fq%3DArgentina%2Buniformes%2Bdel%2Bej%25C3%25A9rcito%26start%3D10%26hl%3Den%26sa%3DN%26prmd%3Div

http://translate.google.co.uk/translate?hl=en&sl=es&u=http://soldados1982.blogspot.com/2009/07/historias-de-soldados-los-uniformes-del.html&ei=Zlv-TM6sG8eIhQe3sPy2Cw&sa=X&oi=translate&ct=result&resnum=1&ved=0CCAQ7gEwADgK&prev=/search%3Fq%3DArgentina%2Buniformes%2Bdel%2Bej%25C3%25A9rcito%26start%3D10%26hl%3Den%26sa%3DN%26prmd%3Div

http://translate.google.co.uk/translate?hl=en&sl=es&u=http://new.taringa.net/posts/info/6401499/Uniforme-del-ejercito-argentino_.html&ei=PVT-TOzCFYSShAeg_oy_Cw&sa=X&oi=translate&ct=result&resnum=9&sqi=2&ved=0CHEQ7gEwCA&prev=/search%3Fq%3DArgentina%2Buniformes%2Bdel%2Bej%25C3%25A9rcito%26hl%3Den%26prmd%3Div

Regards
Wf

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Just to add to this interesting thread - colours of 1911/13 uniforms.