Chremistica umbrosa can be found in South-East Asia, in particular Singapore. If you go to see them, bring an umbrella. I don’t know why these cicadas pee this often, but I imagine they are eliminating some toxin or waste or chemical (sugar, perhaps) that is not good for them.
Want to learn more about the cicadas of Singapore?
The National University of Singapore has six PDF documents about six species of cicadas living in Singapore. Each document contains photos of cicadas, and plenty of interesting information.
1) Record Of The Cicada, Purana usnani Duffels & Schouten In Singapore, With Preliminary Acoustic Analysis by Tzi Ming Leong (Nature In Singapore 2012 5: 13–17 Date Of Publication: 17 January 2012). Link: rmbr.nus.edu.sg/nis/bulletin2012/2012nis013-017.pdf.
This document features photos of the P. usnani as well as analysis of their songs.
A video of Purana usnani singing:
2) Oviposition By The Black And Scarlet Cicada, Huechys sanguinea (De Geer, 1773) In Singapore by Tzi Ming Leong and Ali bin Ibrahim (Nature In Singapore 2011 4: 303–306 Date Of Publication: 18 October 2011). Link: rmbr.nus.edu.sg/nis/bulletin2011/2011nis303-306.pdf.
Huechys sanguinea is a small but beautiful black and red cicada. This document features photos of an H. sanguinea ovipositing (laying eggs) in a tree branch.
An image of H. sanguinea, which can be found in Singapore, Thailand and other S.E. Asian countries (and often in acrylic keychains on ebay).
3) Records Of The Cicada, Chremistica umbrosa (Distant, 1904) In Singapore, With Accounts Of Its Mass Emergence by Tzi Ming Leong, Aminurashid and Benjamin P. Y-H. Lee (Nature In Singapore 2011 4: 163–175 Date Of Publication: 15 June 2011). Link: rmbr.nus.edu.sg/nis/bulletin2011/2011nis163-175.pdf.
This document features information about distribution, emergence, bio-acoustics, communal feeding, and predation.
Here’s a video of an aggregation C. umbrosa urinating and singing:
4) Records Of The Black And Golden Cicada, Huechys fusca Distant, 1892 In Singapore, With Natural History Observations by Tzi Ming Leong, Mishak Shunari, Laurence Y. K. Leong, and Sai Khoon Foo (Nature In Singapore 2011 4: 203–211 Date Of Publication: 8 July 2011). Link: rmbr.nus.edu.sg/nis/bulletin2011/2011nis203-211.pdf.
This document features information about emergence, bio-acoustics, mating, and oviposition of Huechys fusca.
A video of Huechys fusca singing:
5) Records Of The Black And Scarlet Cicada, Huechys sanguinea (De Geer) In Singapore, With Notes On Its Emergence by Ali bin Ibrahim and T. M. Leong (Nature In Singapore 2009 2: 317–322 Date Of Publication: 5 August 2009). Link: rmbr.nus.edu.sg/nis/bulletin2009/2009nis317-322.pdf.
This document features observations of Huechys sanguinea. Huechys sanguinea is a beautiful cicada.
6) The Jade-Green Cicada, Dundubia vaginata (Fabricius, 1787) In Singapore, With Notes On Emergence, Bioacoustics, And Mating by Tzi Ming Leong, Mishak Shunari, Aminurashid and Timothy D. Harvey-Samuel (Nature In Singapore 2011 4: 193–202 Date Of Publication: 5 July 2011). Link: rmbr.nus.edu.sg/nis/bulletin2011/2011nis193-202.pdf.
This document features information about emergence, bio-acoustics, and mating of Dundubia vaginata. Dundubia are known for there huge opercula (the structures on their abdomen that cover the cicada’s tympanum (tympanum are a cicada’s ear drums).