168 DOLERUS GESSNERI. 



segment punctured; dorsum of abdomen bluntly carinated. Wings 

 hyaline; nervures black; stigma brownish on the lower side; tegulae 

 black. 



The $ has the abdomen narrowed considerably towards the apex, the 

 red ring much narrower, sometimes obliterated entirely. 



Length 5^ lines. 



D. timidus, Kl., differs from the present species in 

 being larger, and in having all the tibise and tarsi red, 

 as well as the apical half of the femora ; D. tristis, 

 again, is smaller, has the posterior legs black, the 

 anterior knees and tibise reddish, tegulse reddish, 

 head narrower, and it is also a smaller and narrower 

 insect than dubius. 



Stephens records dubius as being found rarely in 

 July in the vicinity of London. 



It is spread nearly all over the European continent ; 

 eastward as far as the Ural range, and southward to 

 the Mediterranean ; north into Sweden. 



10. DOLERUS GESSNERI. 

 PL XIX, figs. 3 and 3 a, Saw. 



Dolerus gessneri, Andre, Species, i, 273; Cat., 34,* 29; cf. Cam., 

 Tr., Ent. Soc., 1881, 574. 



Black ; anterior knees and basal half of tibiae and spurs red. Wings 

 hyaline ; apical half more or less fuscous. Head and thorax densely 

 covered with a close white pile ; punctured all over ; more or less pilose 

 at the sides and at apex ; the segmental divisions white ; basal segment 

 punctured. Cenchri cream coloured. Antennae as long as the abdomen, 

 thickened, but not very much, from third joint, scarcely attenuated at 

 the apex; third joint considerably longer than the fourth. The 

 scutellum has the puncturation not so distinct as the mesonotum. 



Length 4| 5 lines. 



Ab. a. Fore legs entirely black. 



Of the same size and almost similarly coloured as 

 D. niger, but is easily known by the absence of sutures 

 in the vertex, by the thicker antennas, more deeply 

 and uniformly punctured mesonotum, clearer coloured 

 cenchri and appendiculated accessory nervure in hind 

 wings. Its nearest ally is D. tinctipennis, with which 

 it agrees in the general form of the saw, but that 



