(formerly Cc4 motorboat)  A very wide-ranging species, found across most of Eurasia from northern Italy north to Finland, Norway, and northern Scotland and eastward to central Russia.  Apparently absent from extreme western Europe, e.g., Spain.  It is also rare or absent from the warmest parts of southern Europe and is extremely uncommon south of the Po valley in northern Italy. Shown below are two SRUs, each consisting of many short, closely-spaced volleys of abdominal vibration.  Once entering a duet, an individual lengthens its SRU significantly, often to several minutes!  Nicknamed for the burbling or throbbing acoustic effect of the closely-spaced volleys.

The well-known but vaguely diagnosed species C. carnea (Stephens, 1835) has been shown to correspend to the Cc4 song species, based on geographic distribution, ecology, ecophysiology and adult morphology.  The arguments for this designation are given in Henry, C. S., S. J. Brooks, P. Duelli, and J. B. Johnson. 2002. Discovering the trueChrysoperla carnea (Stephens) (Insecta: Neuroptera: Chrysopidae) using song analysis, morphology, and ecology. Ann. Entomol. Soc. Am. 95(2): 172-191.