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Photo#1370023
Celastrina echo echo? - Celastrina echo

Celastrina echo echo? - Celastrina echo
San Jose, Santa Clara County, California, USA
May 13, 2017
Size: ~ 1 cm
I think this is Celastrina echo echo, but I'd like to hear entomologist confirmation. Is it also possible to determine sex of insects?

Pacific Azure males
Not a entomologist but a butterfly nut so I can provide some info on determining butterfly sexes.
Coloration - Many have different color patterns i.e. many swallowtails have blue on the dorsal female hindwing and males have little or none.

Dimorphism - Males and females are different in color or shape and do not appear to be same species i.e. Diana Fritillary

Size - Often the male is smaller.

Abdomen shape - round and wide in female, male narrow

Markings / spots - some sexes have distinct markings or spot patterns. i.e. Gray male hairstreak with orange on abdomen vs. none for female.
Males often have specialized dark scales which form a stigma on the dorsal forewing that release pheromones.

Habits - males of some species perch high in trees or hilltops to watch for females. Most males puddle to get moisture, minerals and nutrients. The azures you observed were puddling.
I call it "Guys hanging out at the bar"

Season - In some species males may emerge prior to females for the flight season.

Moved from ID Request.

 
Thank you for help and explan
Thank you for help and explanations!

I usually could use coloration differences if reference images of males/females are available, but sometimes it's necessary to pay attention to little details, which is not easy to learn :-(

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