NO. 2242. MORFUOLOGY OF THE tiTREfHlPTERA—l'lEROK. 



443 



Group 15. 



41. cressoni Pierce, 1909; Maine; parasite of Andrena cressom Rob- 



ertson. 



42. diabola Pierce, new species; North Dakota; parasite of Andrena 



Msnlieis Viereck, var. 



(iROUP 16. 



43. hartfordensis Pierce, 1009; Georgia, parasite of Andrewi hart- 



fordensis Cockerell. 



44. neonanae Pierce, new species; Georgia; parasite of Andrena 



neonana Viereck. 



12. STYLOPS ASTERIDIS Pierce. 



Tabic 0/ measure in ents. 



Group 1. 



13. STYLOPS BIPUNCTATAE Pierce. 



It has two toothed mandibles and spiracles distant from margin. 



Tabic of measurements of female. 



Taking measure 1 as unit, the following relative lengths of th© 

 other measurements are obtained: 



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

 obtained by adding the six relative measurements together. This 

 gives totals ranging from 4.41 to 4.66 and aA^eraging 4.56, which we 

 may call the species index. 



14. STYLOPS MOESTAE, new species. 



Described from two females extracted from a specimen of An- 

 drena moesta Smith, determined by H. L. Viereck, collected at 

 Govan, Washington, March 29, 1911, by J. A. Hyslop. 



