Small Blue (Cupido minimus)

 

Restricted to unimproved limestone grassland sites with Kidney Vetch in the Mendips, Small Blues are easy to overlook as they are very small, usually less than an inch across, and have brown wings with just a scatter of blue scales on the male. Even in good years, the butterflies are usually only present in low numbers  

 

Images L-R: Male - the female is wholly brown above with no trace of blue; underside; caterpillar on Kidney Vetch seedhead

 

Flight period: May to June and sometimes a second brood in August to September 

 

Distribution map:

 

Small Blue