JOURNAL OF ENTOMOLOGY AND ZOOLOGY 



29 



EXPLANATION OF FIGUEES 



PLATE I. 



Figure 1. Sirex behrensii, j . From a drawing by the author. 



Figure 2. Urocerus laxodii, j . From a drawing by Miss Annie Sharp. 



PLATE II. 

 Figure 3. Tremex columba, 9 . Photograph by the late Professor M. V. Slingerland. 

 Figure -1. Xcrls spectrum. Mouth parts. Photograph by Professor C. R. Crosby 

 and the author. 



Figure 5. Urocerus. Mouth parts. Photograph by Professor C. R. Crosby and 

 the author. 



PLATE III. 



From drawings by the author. 



Figure 6. The wings of Sirex juvencus cyaneus, showing the veins labelled accord- 

 ing to the Comstock-Needham system. 

 C— Costa. 

 Sc — Subcosta; Sci and Sc2, respectively the first and second branches 



of subcosta. 

 R — Radius; Ri, R~, Rs, R4, and R; respectively the first to fifth branches 



of radius. 

 Rs— The radial sector (R-+3+1+0). 

 M — Media; Mi, Mj, Ms, and Mi respectively the first to fourth liranches 



of media. 

 Cu — Cubitus; Cui and Cui respectively the first and second branches of 



cubitus. 

 1st A, -'d A, 3d A — Respectively the first, second, and third anal veins. 

 r — The radial cross-vein, 

 r-m — The radio-medial cross-vein, 

 m — The medial cross-vein. 

 m-cu — The medio-cubital cross-vein. 



Coalescence of veins or branches of veins is indicated liy a -|- sign. 

 Figure 7. The wings of Urocerus californicus, the cells numbered according to the 



Comstock-Xeedham system. 

 C— The costal ceU. 

 Sc, Sci — Subcostal cells. 

 Scl — The second subcostal cell, or stigma. 

 R, 1st Ri, Jnd R=, Rn, Ri, and Rr,— Radial cells. 

 M, Mi, 1st M_~, M::, and M.— Medial cells. 

 Cu and Cui — Cubital cells. 

 1st A, 2nd A, and 3rd A — Anal cells. 

 Ap. — The a]ipeiidiculate cell. 



The cells take their names from the vein or branch of a vein which 

 in a primitive condition forms their anterior margin. 



Coalescence of ceUs is indicated by a -f sign. 

 Figure 8. The wings of Urocerus flavicomis, the veins labelled according to a com- 

 bination of the systems of Konow, Cresson, etc. 

 c — The costal vein, 

 sc — The subcostal vein, 

 em — The externo-medial vein, 

 b — The basal vein, 

 r — The marginal or radial vein. 



tc", re-, tc" — The first, second, and third transverse cubital veins, 

 cu — The cubital vein. 



rc^, re' — The first and second recurrent veins, 

 d — The discoidal vein, 

 tm — ^The transverso-medial vein. 



