NO. 2242. MORPHOLOGY OF THE 8TREP81PTERA— PIERCE. 



449 



The range of differences is very small. A numerical index may be 

 obtained by adding the six relative measurements together. This 

 gives an average index of 4.43. Illustrations are given of the female 

 cephalothorax and mandibles. 



29. STYLOPS OKLAHOMAE Pierce. 



TaMe oj measurements of female. 



Specimen ■ 



Type, Ardmore, Oklahoma , 



Relative length compared to width at spiracles 



1 



46.5 

 1.00 



27.5 

 0.59 



17 

 0.36 



33 

 0.70 



33 

 0.70 



51 

 1.0 



Index 

 total. 



30. STYLOPS SALICTARIAE, new species. 



Described from seven female specimens from Andrena salictaria 

 Robertson, collected by Charles Robertson at Carlinville, Illinois. 

 Specimens in collection United States National Museum. 



Female. — Cephalothorax yellowish brown, with broad basal dark 

 reddish brown band. Length of cephalothorax of type 1.8 mm.; 

 breadth 0.7 mm. Mandibles broad, bhmtl}^ two toothed. Spira- 

 cles laterally slightly prominent. 



Table of ineasurements of female. 



Taking measurement 1 as unit, the following relative lengths of the 

 other measurements are obtained : 



Specimen 



Relative length compared to width at spiracles 



l(type) 



2 



3 



4 



5 



6 



7 



Average 



Index 

 total. 



4.54 

 4.52 

 4.63 

 4.78 

 4.36 



(?) 



4.56 



Type.— CB^t. No. 21443, U.S.N.M. 



]43— 19— Proc.N.M.vol..'54- 



-30 



