Dorothy J. Jackson 115 



(34) *Herbst, p. F. W. (1795). Natur system aller hekannten Insekten, Der Kdfer, 



Part (5, 245 and 354. 



(35) Ormerod, E. a. Reports on Injurious Insects, 1879, 8; 1880, 5, (5; 1881, 38, 39; 



1883, 57-59; 1884, 3-5; 188G, 80, 81; 1889, 15-18; 1892, 102 I H). 

 (3G) SopoTZKO, A. A. (191G). Abstract in Rev. App. Ent. A. iv, 293. 

 (37) *Walton, J. (184(j). Ann. and Mag. Nat. Hist, xvn, 234. 



* The references marked with an asterisk refer to works in which other species dealt 

 with in this paper aie inchided, and they will therefore be omitted from subsequent 

 bibliographies. 



EXPLANATION OF PLATE III 



Fig. 1. Fully developed wing of Sifona hispiJula. 



Fig. 2. Brachpterous wing of S. hispiduki. 



Fig. 3. A larger form of same with clearer venation. 



Fig. 4. Wing of a specimen of S. sulcifrons from Invershin, Sutherland. 



Fig. 5. Normal wing of S. sulcifrons. All magnified 40 times. 



4= anal; C = costa; C^ = head of costa; CC7 = cubitus; i^P = flexor plate, or 3rd 

 axillary; 5 = radius; iS'C = subcosta; iSP = scapular plate, or 1st axillary; JE' = point of 

 transverse folding of wing. (Nomenclature according to A. D. Hopkins in "The genus 

 Dendroctonus," U.S. Dept. Agr. Bur. Ent. Technical Series, No. 17, Part I, 1909.) 



{Received Dec. 6th, 1921.) 



