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V. An Uniomological Excursion to Moncayo, N. Spain, by 

 George Charles Champion, F.Z.S. ; icith some 

 rcmarhs on the habits o/Xyleborus dispar, Fair., by 

 Dr. Thomas Algernon Chapman, M.D., F.Z.S. 



[Read March 2nd, 1904.] 



Plates XV. and XVI. 



The excursion made by Dr. Chapman and myself to the 

 Sierra de Bejar in 1902 having been a fairly successful 

 one, we decided last summer to pay yet another visit to 

 Spain, the irregular range of mountains lying about mid- 

 way between the Pyrenees and the Guadarrama being 

 our objective on the present occasion. The mountainous 

 region selected was that included between the valleys of 

 the Ebro and the Duero (Douro), commencing near Burgos 

 and terminating eastward in the isolated lofty mass, 7600 

 feet elevation, known as Moncayo, tlie latter forming the 

 boundary between the Province of SoriainOld Castile and 

 Aragon. To the south of Moncayo the adjacent districts 

 are of considerable altitude, while to the north the valley 

 of the Ebro is very much low^er, and backed by the 

 distant range of the Pyrenees. The geological formation 

 of these mountains, instead of being almost wholly granite, 

 as in the Bejar and Guadarrama Sierras, is very varied, 

 and includes a good deal of limestone ; hence we antici- 

 pated that there would be a considerable difference in the 

 insect-fauna, and this proved to be the case. The region 

 visited was perhaps too far north for many special Spanish 

 forms, a number of the species met with being common to 

 the Eastern Pyrenees, still there was a considerable ad- 

 mixture of southern types. Leaving London on June 

 22nd, we travelled, via Paris, direct to Guethary, in the 

 Basses-Pyrenees, a pleasant seaside place not far from 

 Biarritz ; and after spending a few days there, continued 

 our journey to Burgos, After a day or two here, we moved 

 on to Canales, a centre suggested to us by the manager of 

 the Sierra Company in Burgos, who was kind enough to 

 furnish us with passes by the " Ferrocarril minero de 

 Monterrubio a Villafria " to their present railhead at 

 TRANS. ENT. SOC. LOND. 1904.— PART L (APRIL.) 6 



