The morphometrical study concerned a species of medical and veterinarian interest, belonging to the Culicidian family: Culex pipens Linnaeus 1758 collected from 2 types of ecosystems: Annaba, and Oum EL Bouaghi, situated respectively in The East and Northeast of Algeria. These 2 zones are known for their Mediterranean climate (Annaba) and semiarid climate (Oum El Bouaghi).The measurements have concerned 10 criteria for larvae of stage 4, and 32 for male and female adults. Themorphometrical data have undergone comparative analysis carried out by MINITAB 16 FR program. On one hand, the test of student disclosed the presence of significant differences, highly significant, on the other hand, the analysis of multivaried variance MANOVA, using 3 tests, Wilk ‘S Lamba, Lawley _Hotteling and Pllai’s showed for all larval criteria highly significant differences, highly significant differences for females, and only significant for males.
