This page can help you identify the butterfly you have seen if it belongs to the Lycaenidae or Riodinidae family :  
1) look at the butterfly thumbnails below and determine the genus or species which most closely matches your butterfly  
2) then find the genus or the species in the alphabetic index and check the species-pages by clicking on the latin names  
Please note that in some genera (Lysandra sp., Polyommatus sp., Plebejus sp. Cupido sp., Glaucopsyche sp., Cyaniris sp....), males are blue on the upperside whereas females are brown (with variable orange spots and blueish suffusion). See Lysandra bellargus page as an example.  
Agr --> Lys Mac --> Vac Illustration of the main genera and species
Agriades optilete
Agriades orbitulus
Agriades pyrenaica 
Agrodiaetus sp. [see Polyommatus sp.]
Albulina orbitulus [see Agriades orbitulus]
Aricia nicias
Meleageria daphnis [see Polyommatus daphnis]
Neozephyrus quercus [see Quercusia quercus]
Agriades sp.
Aricia sp.
Lysandra sp.
Polyommatus sp.
Plebejus sp.
Callophrys sp. 
Celastrina argiolus
Cupido sp.
Glaucopsyche sp.
Hamearis lucina

Lycaena sp.
Maculinea sp.
Cacyreus marshalli
Satyrium sp.
TABLE OF CONTENT (of species pages)
 photo available        species not pictured yet
fam. LYCAENIDAE & RIODINIDAE male female pair larva egg chrysalis last update
Agriades glandon         14/02/2015
Agriades optilete           30/08/2014
Agriades orbitulus       19/04/2019
Agriades pyrenaica         12/10/2013
Aricia agestis 11/05/2018
Aricia artaxerxes         11/05/2018
Aricia montensis         11/05/2018
Aricia morronensis         30/08/2014
Aricia nicias           05/02/2015
Cacyreus marshalli   09/11/2013
Callophrys avis         04/04/2014
Callophrys rubi   30/05/2015
Celastrina argiolus   19/04/2019
Cupido alcetas         23/11/2013
Cupido argiades         27/03/2015
Cupido minimus     22/02/2015
Cupido osiris   27/04/2019
Cyaniris semiargus       22/02/2015
Eumedonia eumedon       08/06/2019
Glaucopsyche alexis     27/03/2015
Glaucopsyche iolas   02/12/2013
Glaucopsyche melanops       27/03/2015
Hamearis lucina       17/03/2013
Laeosopis roboris       20/04/2019
Lampides boeticus   20/04/2019
Leptotes pirithous 08/05/2020
Lycaena alciphron     09/02/2015
Lycaena dispar       17/03/2013
Lycaena helle         17/03/2013
Lycaena hippothoe       14/06/2019
Lycaena phlaeas 03/06/2015
Lycaena tityrus   18/05/2019
Lycaena virgaureae       22/04/2019
Lysandra bellargus   03/06/2015
Lysandra coridon       03/06/2015
Lysandra hispana       12/05/2018
Maculinea alcon       12/10/2013
Maculinea arion     22/04/2019
Maculinea nausithous         12/10/2013
Maculinea rebeli       22/04/2019
Maculinea teleius         12/10/2013
Plebejides pylaon         12/10/2013
Plebejus argus       31/01/2015
Plebejus argyrognomon       28/02/2014
Plebejus bellieri       26/04/2020
Plebejus idas     13/05/2018
Polyommatus amandus     10/05/2019
Polyommatus daphnis       09/02/2015
Polyommatus damon     13/05/2018
Polyommatus dolus         14/10/2013
Polyommatus dorylas       10/05/2019
Polyommatus eros       10/05/2019
Polyommatus escheri     14/05/2019
Polyommatus icarus     28/04/2019
Polyommatus nivescens            
Polyommatus ripartii       15/06/2019
Polyommatus thersites     27/04/2019
Pseudophilotes baton   02/03/2014
Quercusia quercus         12/10/2013
Satyrium acaciae       04/03/2014
Satyrium esculi         17/03/2013
Satyrium ilicis         04/03/2014
Satyrium pruni           17/03/2013
Satyrium spini       04/03/2014
Satyrium w-album       01/06/2019
Scolitantides orion   05/05/2019
Thecla betulae       12/02/2015
Tomares ballus     17/03/2013