[A new blackfly species Cnetha itelmenica sp. n. (Diptera: Simuliidae) from Kamchatka]

The description of a new species Cnetha itehnenica Chubareva et Yankovsky, sp. n. is given. Only 6 species of the genus Cnetha have the simple lobes of rectal organ (C. fontia, C. garniensis, C. gejgelensis, C. costata, C. subcostata and C. karzhantavica). These species distribute only in Southern Europe, Northern Africa and Transcaucasia, excluding C. subcostata distributed in NE China, Korea and Japan. C. itelmenica differs from C. fontia and C. garniensis in having a deep inlet of the head capsula, from C. costata, C. subco- stata and C. karzhantavica in the different number of hook rows in the posterior circlet (86-90 versus 96-100 in C. gejgelensis and C. costata, 68 in C. karzhantavica). The new species differs from other Siberian and Far Eastern species of the genus (C. cornifera, C. paracornifera, C. patrushevae, C. pugetensis, C. shutovae) in having simple lobes of the rectal organ, from C. gejgelensis in having another pattern of setae arrangement on the submentum (by 1 line, versus 2 lines in C. gejgelensis), from C. shutovae, C. pugetensis and C. patrushevae in the different number of hook rows in the posterior circlet (86-90 versus 60-62 in C. shutovae and 62-66 in remains), and from C. pugetense and C. patrushevae in the number of primary fans (36-40 versus 41-52). C. itelmenica differs from C. vernum (as base standard), as well as from other studied species of the genus, in having a species-specific disk pattern, three wide homozygous inversions in IS, IL, IIIL, and a little homozygous inversion in IIS. It differs from C. fontia, C. garniensis, C. costata and C. zakhariensis in the absence of chromocenter and presence of additional heterochromatic B-chromosomes.