14 Mr. F. Walker on some Chalcidites of North America. 



This species differs from Jung, complanata, L., by the smaller 

 and more convex leaves, their olive-brown colom-, their lesser lobe 

 not sharply reflected upon the upper but having a tumid base, 

 by the de'flcxed perich?etial leaves, by the periyonia occm-ring 

 usually at the termination of the shoot and not on proper short 

 lateral branches, and by the angulate portion of the lower lobes 

 of the leaves being shorter. This species prefers very wet surfaces 

 of mural rocks, w^hile Jung, complanata, L., is partial to trees. 



V. — Descriptions of some Chalcidites of North America, col- 

 lected by George Barnston, Esq. By Francis Walker, Esq., 

 F.L.S. 

 The two hemispheres of the earth are said to be represented in 

 their climate and productions by the higher moimtains, whose 

 tops are compared to the poles, and the plains whence they arise 

 to the equatorial line. The vegetation and animals on one side 

 of a mountain range are often very different from those of the 

 other side, while on its summit they are alike. Thus also in 

 proportion as we are more remote from the poles and nearer to 

 the tropics, we find creatures more numerous and more various, 

 due allowance being made for the soil, elevation, size and form of 

 the land. In entomology, the land within the Arctic circle 

 comprises one insect region, and of the territories sm-rounding it 

 have been formed three regions, that of North America, that of 

 Europe, and that of Siberia. The insects here described were 

 taken at Martin's Falls, Albany River, Hudson's Bay*, which is 

 contained in the North American region. I am indebted to 

 G. Barnston, Esq., for this opportunity of adding to the know- 

 ledge of the geography of the Chalcidites. 



Callimome splendidus, Barnston s MSS. fern. Viridis cupreo varius, 

 abdomine purpurea, untennis nigris, pedibus rufis, alis subfulvis. 

 (Corp. long. lin. 2 ; alar. lin. 3.) 



Body convex, thinly clothed with hairs : head and thorax mi- 

 nutely squameous ; the scales on the head and on the fore part of the 

 thorax so disposed as to form little transverse undulations : head 

 green, aeneous in front, as broad as the thorax : eyes and ocelli red : 

 mandibles fulvous : antennse black, clavate, pubescent, shorter than 

 the thorax; first joint fulvous, long, slender; second long-cyathiform ; 

 third and fourth verj^ minute ; fifth and following joints to the eleventh 

 successively shorter and broader ; club linear, conical at the tip, more 

 than twice the length of the eleventh joint : thorax elliptical, green : 

 prothorax transverse, forming beneath in front a slender neck which 

 joins the head, its breadth more than twice its length : scutum of the 



* See " Observations on the progress of the seasons as affecting animals 

 and vegetables at Martin's Falls, Albany River, Hiul.-on's Bay," by G. 

 Barnston, Esq., in the EdinbiU'gh New Philosophical Joiniial, vol. xxx. 

 1S40-41. 



