Euura aegra ZMUO.

201 Euura aegra group Four species are recognized. Most specimens are more or less black, but females of E. aegra and E. lindqvisti can have an extensively reddish mesepisternum and the abdomen ventrally and apically extensively pale. Euura aegra and E. hebes have a “ Pristiphora - type ” valvula 3 (i.e., with a distinct and deep invagination posteriorly), which by itself distinguishes these species from most other Euura. In addition, their “ Amauronematus - type ” head, bifid claws, matt mesepisternum, and structure of the saws help to distinguish these two species from the few other Euura with a similar, but less deeply invaginate valvula 3, and from Pristiphora. The valvula 3 of Euura lindqvisti is similar to most other Euura, so that the species could most easily be confused with E. nimbus and darker specimens of E. sagmarius, but again the “ Amauronematus - type ” head, bifid claws, matt mesepisternum, and its saw structure should enable its separation from the other species. Euura sempersolis is the darkest of the four species and has valvula 3 “intermediate” between E. aegra-hebes and E. lindqvisti (i.e., without distinct invagination and not as long and pointed as in E. lindqvisti), but the saw is rather similar to E. aegra and E. hebes. Males within the group are also mostly black and very similar to each other or even to some other groups that are closely related (former Amauronematus). We have not attempted here to distinguish the males morphologically, although this might be possible after examination of greater numbers of specimens, instead, we have used nuclear genes to associate them with females.