LIST OF ILLUSTRATIONS XI 



The opticai. pboperties and chemical composition of glauconite 



By Clarence S. Ross 



Page 



1. Graphic presentation of glauconite analyses, showing variation in 



composition between end members 7 



2. Dehydration curve of Missouri glauconite 8 



Miscellaneous new chalcid-flies of the Hymenopterous 



FAMILY EnCYRTIDAE 



By P. H. Timberlake 



]. Vosleria signata Timberlake. Fore wing of female 5 



The Chrysotoxine Syrphid-flies 



By Raymond C. Shannon 



Figs. 1-3. (1) Inner view of the antenna to show relative length of 

 joints of : a. Chrysotoxum vcntricosum Loew, &. C. ypsilon Will- 

 iston, c. C. hicincUim Linnaeus. (2) Abdomen of C vcntricosum 

 Loew, female, showing the even outline. (3) Abdomen of €. 

 ypsilon Williston, female, showing the projection of the apical 

 corners of the tergites 2 



A revision of the parasitic wasps of the subfamily Braconinae 



OCCURRING in AMERICA NORTH OF METSICO 



By C. F. W. Muesebeck 



Fig. 1. — Wings of Bassus sanctus Say. Veins. — Anterior wing: AB= 

 costa; BO=stigma; CH'D=metacarpus ; HKH'=radius; GK'G' = 

 cubitus; FT=mediU9; TI'P=discoideus; PP'=subdiscoideus; 

 UT'=submedius; T'U'=brachius; JT=basal vein; KK'=lst inter- 

 cubitus; LL'=2d intercubitus ; ir=recurrent vein; TT'=nervulus. 

 Posterior wing: AJB=subcost6lla; HH=radiella ; GG'=cubitella; 

 FT=lst abscissa of mediella; TG=2d abscissa of mediella ; UT' = 

 submediella; JG=basella ; TT'=nervellus. Cells. — 2=radial cell; 

 3=cubital cells; 4=median cell; 5=discoidal cells; 6=submedian 

 cell; 7=brachial cells; 8=anal cell; ll=costellan cell; 12=radl- 

 ellan cell; 13=mediellan cell; 14=cubitellan cell; 15=submedi- 

 ellan cell; 16=discoidellan cell; 18=brachiellan cell 3 



Notes on the age of the continental Tbiassic beds in North America 

 with remarks on some fossil vertebrates 



By F. R. von Huene 



1-2. (1) Typothorax coccinarum (Cope). Trias. (Probably Upper), 

 from near Tanners Crossing, Little Colorado Valley, Ariz. U. S. 

 Nat. Mus. No. 5784. Right femur, distal half, a, from below; 

 6, section at upper break ; c, section just below trochanter ; d, 

 outline at distal end; e, lateral view. (2) Proximal extremity of 

 another right femur, same locality as Fig. 1, No. 2163, U. S. Nat. 

 Mus., a, from below ; ft, outline of proximal face ; c, section at 

 distal break. Both 1 : 4 nat. size 7 



