Evergestis alborivulalis
Evergestis alborivulalis is a butterfly of the family of Crambiden ( Crambidae ).
Features
The moths reach a wingspan of 18-20 millimeters, according to another source from 13.5 to 16.5 millimeters. The Maxilliarpalpen are triangularly and blackish. The labial palps are short and inconspicuous. Head and thorax are blackish brown speckled sparsely white. The metathorax is provided with a pair white drawing, the abdomen is striped white. The forewings are mottled brownish black and with short narrow white scales. The drawing consists of four white, irregularly curved and angled cross lines equally spaced and run more or less parallel to the outer edge. A pair of small white spots is distal to the black Diskalfleck, three or four more spots are distributed in midfield. The fringe scales are irregular blackish brown brindle and white. The hind wings are also dyed as the front wings. The basal half - with the exception of the veins - whitish and has a black Diskalfleck. The outer white transverse band is curved and serrated. In the area of Analwinkels a white Subterminallinie is indicated. The fringe scales are also colored like the forewings. The underwings are white and speckled blackish along the veins and in Subterminalbereich. The external cross- bonding is on the front and rear wings and white serrated. In Subterminalbereich are scattered white spots. The hem line is black, the fringe scales are irregularly spotted.
In the male the uncus is rather short and strong. It has a rounded tip and is slightly hairy. The Gnathos is dagger -shaped and tapers sharply. The tip is provided with short papillenartigen teeth. The Valven are short, have a wide base and are hairy. The clamp member ( Clasper ) is missing. The phallus is short and thick. In the distal part is an elongated group of fairly large Cornuti. Distal to it is a second, almost circular group of small, arranged in rows Cornuti.
In females, the corpus bursae is provided almost spherical and with a tower-shaped bulge from which the ductus bursae arises. The signals are inconspicuous. The ductus bursae is quite wide, the Colliculum is narrowed at both ends. The antrum is narrow sclerotized funnel-shaped and strong.
Similar Species
Evergestis alborivulalis can not be confused with other species. It is more complex than any other strongly marked black and white colored Pyrausta species including Atralata albofascialis ( Treitschke, 1829) ( Odontiinae ).
Dissemination
Evergestis alborivulalis Europe has a scattered distribution. The species was observed in Spain, Bosnia and Herzegovina, Slovakia, Hungary, Bulgaria, on the Balkan Peninsula, the Crimea and the European part of Turkey. Outside Europe, it is in the Asian part of Turkey, located in the Urals and south Siberia. The eastern limit of distribution is achieved in the Baikal region.
Biology
The preimaginal stages are unknown. The type populated mountain regions and flies from April to May
System
From the literature, the following synonyms are known:
- Ennychia alborivulalis Eversmann, 1843
- Euergestis canalesialis Hampson, 1913