Notes on infraspeciation in Coenagrion caerulescens (B. de Fonscolombe, 1839), with description of C. c. isabelae ssp. nov. from Morocco (Zygoptera: Coenagrionidae)

The nominate ssp. and C. c. theryi (Schmidt) were studied from a biometric point of view as well as using features of their external morphology. It is shown that the abdominal colour patterns cannot be utilized for differentiation between the sspp. – C. c. isabelae ssp.n. (holotype 3, allotype $; Ziz R., Morocco, 5-VI1I-1985; deposited at Dept Anira. Biol., Univ. Malaga) is described and illustrated. Males are distinguished by the shape of anal appendages, females by the pronotal cleft. The new ssp. occupies a narrow stretch of land on the northern limits of the Sahara.