OF WASHINGTON, VOLUME XI, 1909 143 



EXPLANATION OF PLATES X TO XIII. 

 PLATE X. 



FIG. 1. Celaenopsis pedalis. FIG. 6. Laelaps nntltispiiiosus. an- 



2. Gamasus attenuipes. terior dorsum. 



3. Gamasus posticatus. 7. Gamasus attenuipes, vulva. 



4. Pterodectes innlicns. 8. Gamasus pusticatiis. Ir.u II. 



5. Laelaps multispin<>sus. 9. Cheyletus longipes. 



PLATE XI. 



10. Listrophorus valnius. and 13. Laelaps propheticus. 



head from side. 14. Tetranychopsis spinosa. 



11. Listrophorus validus. fe- 15. Laelaps pedalis. nn>\ mouth- 



male tip of venter. parts below. 



12. Liponyssus canadensis. 16. Sejus macropilis. 



PLATE XII. 



17. Rivoltasia bispinosa. 21. Cheyletiella canadensis. 



18. Celaenopsis latus. 22. Oribatella formosa. 



19. Myobia canadensis. 23. Liacarus parvulus. 



20. Oribata neosota. 



PLATE XIII. 



24. Pterodectes armatus. 28. Laelaps longiseta, dorsum. 



25. Galunma syhicola. 29. Pelops terminalis. 



26. Cymberemaeus parvula. 30. Laelaps longiseta. venter. 



27. Oribata perolota. 31. Oribata canadensis. 



NEW SPECIES OF ANDRENA. 



[Hymenoptern Amhenidaj.] 

 BY H. L. VIERECK. 



The following species are described in anticipation of Mr. 

 \Y. D. Pierce's forthcoming monograph of the Strepsiptera, in 

 which the proposed names will be used. 



Andrena crawfordi, new species. 



Female, 10 mm. Ocular distance greater than the occipito-clypeal 

 distance, facial fovea not extending below the antennal line, two-thirds 

 as wide as or a little wider than two-thirds of the shortest distance 

 between the lateral ocellus and nearest point on eye, fovea without a 



