368 RHTNCHOPHORA. [Tapinotus. 



Dr. Power's specimen was taken by the Rev. Laundy Brown at Horning Fen, Norfolk, 

 in 1838; it appears to be spread over Central and Northern Europe and Siberia. 



RHYTIDOSOIVIUS, Schonherr. 



Three species are known as belonging to this sub-genus, one from 

 Greenland and two from Europe ; the single British species is a small 

 round convex black insect, which may be known from, all the other 

 sub-genera of Ceuthorrhynckus, except Poophagus, by not having the 

 elytra so strongly and more roundly cut back at shoulders ;* from the 

 last named sub-genus it may easily be separated by its shape as well 

 as by the six-jointed funiculus of the antennae ; the rostrum is stout 

 and is received in a rather shallow f ovea on the mesosternum ; the tibise 

 are broad and the tarsal claws are armed with a tooth; the prosternnm 

 is enlarged behind the anterior femora, and the interstices of the elytra 

 are narrow and subcostiform. 



R. g-lobulus, Herbst. Short and broad, convex, subglobose, black, 

 rather shining, with the underside .and, as a rule, the basal portion of 

 suture, thickly clothed with white scales ; rostrum stout ; antennae 

 black, pitchy or pitchy red at base ; thorax comparatively long, coarsely 

 punctured, constricted before apex, with a broad central furrow at base ; 

 elytra with very broad and strong coarsely punctured stride, interstices 

 much narrower than the striae, convex, somewhat asperate behind ; legs 

 black, rather stout. L. 1^-lf mm. 



Male with all the tibia? armed with rather a large hook ; abdomen 

 with the first and second segments broadly impressed. 



On sallows ; according to M. Bedel ic is found on the shoots of Populus tremula 

 and P. alba; rare; Cooinbe Wood, Surrey (Stephens); Hampsteiid (Power) ; Hamp- 

 stead and Wimbledon Common (S. Stevens) ; New Forest (Power); Langworth 

 Wood, Lincoln, where I captured a pair by general sweeping on September 26th, 

 1881; Northumberland district, Wallington (Power). 



AIVXAXiUS, Schonherr. 



This genus forms a sort of transition between Geutliorrliynclius and 

 its allies and the Bhinoncus group ; it resembles the former in the 

 greater length of the rostrum, but differs in the formation of the 

 prosternum, which is reduced to a narrow border before the anterior 

 coxae and is not incised at throat ; the anterior coxae are almost con- 

 tiguous and the rostrum is not received in a groove ; the antennae are 

 ten-jointed ; the thorax is not constricted at apex and has neither 

 tubercles at sides nor a central channel ; the femora are simple and the 

 tarsal claws are armed with a sharp tooth ; both the described species 

 are found in Europe, and one occurs locally in Britain. 



* This character is not so obvious in this species as in Poophagus and is, perhaps, 

 rather misleading ; the emargination, however, is blunter, and the sides of elytra 

 near it more rounded than in Ceuthorrhynchus. 



