Cobalt Longtail

Here is a wonderful and classic picture of Urbanus proteus: http://www.projectnoah.org/spottings/7364785

Welcome! I also learn a lotby doing some IDs. And sometimes there are really these tiny little details...

I apologize, but it is not Proteus. This one should have some additional small spots on the apical area of the forewing: http://butterfliesofamerica.com/imagehtmls/Eudaminae/Urbanus_p_proteus_John_D_McArthur_St_Pk_Palm_Beach_County_FL_USA_11-21-07_012_i.htm http://butterfliesofamerica.com/imagehtmls/Eudaminae/Urbanus_p_proteus_M_Ruta_175_Road_San_Martin_Soyolapan_OAX_MX_15-26-VIII-07_i.htm In addition there are some different spots if you look at #2 and compare with: http://butterfliesofamerica.com/imagehtmls/Eudaminae/Urbanus_proteus_Mission_Hildalgo_Co_TX_USA__7-XII-04_i.htm The 2 black spots in the row nearer towards the head are separated (in your shot not) and just below there should be a white stripe along the black spot (which yours has not). But I must admit although you had 2 excellent captures which are essential for an ID it's not an easy one. After looking very carefully I think it is Urbanus viterboana: http://www.flickr.com/photos/grandma-shirley/5241440963/ http://butterfliesofamerica.com/urbanus_viterboana.htm The only alternative would be Urbanus belli, which has, however, a more "golden" base on the forewing (next to the head), which yours has not: http://www.neotropicalbutterflies.com/Site%20Revision/Pages/SkipperPages/Skippers_Pyrginae_Group5/Skippers_Pyrginae_Group5_Pages/Urbanus_belli.html

Come back for a closer ID...