214 E. B. WILLIAMSON. 



Very rarely the first postanal cell is divided by a vein either at 

 right angles to the length of the wing (see dotted line, fig. le, plate 

 viii) or parallel to it, and extending from the first branch of the 

 anal vein to the anal vein or to the vein separating the first and 

 second postanal cells (see dotted lines, figs, la and lb, plate viii). 

 This crossing of the first postanal cell would seem to be as rare as 

 the crossing of the triangle in this genus, and rarer than the mis- 

 placement of the second thickened antecubital from the fifth to the 

 fourth or sixth. 



Following is a list of the species examined with the number of 

 wings of each species similar to figs. 1-6, plate viii. 



EUROPEAN SPECIES. 



1. G. pulchellus, fig. la, 2; fig. Ic, 4 : fig. 3 (with s. pa. divided), 1 ; fig. 3, 1. Total 8. 



2. G. vulgntissimus, fig. 2, 4. Total 4. 



3. G. simillimus, fig. 3 (with s. pa. divided), 1 ; fig. 3. 3. Total 4. 



NORTH AMERICAN SPECIES. 



4. G. pallidus, fig. 1, 2. Total 2. 



5. G. exilis, fig. la, 60; fig. 16, 33; fig. 3 (with s. pa. divided), 7. Total 100. 



6. G. sordidus, fig. la, 9: fig. 16, 9; fig. 3 (with .sp. a. divided), 4. Total 22.' 



7. G. deiicriptus,ng.la,,8; fig. lb, 2; fig. 3 (with s. pa. divided), 4 ; fig. 3, 1. Total 1.5. 



8. G. spicaius, fig. la. 19 ; fig. 16, 13. Total 32. 



9. G. miwttus, fig. la, 4; fig. 16, 3; fig. 3 (with s. pa. divided). 1. Total 8. 



10. G. qiiadricolor, fig. la, 5; fig. 16, 1; fig. 3 (with s. pa. divided), 1. Total 7. 



11. G. viridifrons, fig. 16, 5; fig. 3 (with s. pa. divided), 2; fig. 3, 1. Total 8. 



12. G. ahhremaUm, fig. la, 9 ; fig. 16, 16 ; fig. Id, 1. Total 26. 



13. G. brevis, fig. 1«, 91 ; fig. 16, 49 ; fig. Id, 5 ; fig. 3 (with .s. pa. divided), 7 ; fig. 



3, 20 ; fig. 3a, 1. Total 173. 



14. G. qradinellus, fig. la, 19; fig. 16, 11; fig. 3, 1. Total 30. 



15. G. militaris, fig. 16, 2. Total 2. 



16. G.fnrcifer, fig. la, 3; fig. 16, 1. Total 4. 



17. G. villosipes, fig. 4, 18 ; fig. 5, 6. Total 24. 



18. G. externiJ, fig. 4, 4 ; fig. 5, 7. Total 11. 



19. G. crassus, fig. 4, 11 ; fig. 5, 12. Total 23. 



20. G.fraternus, fig. 4, 13; fig. 5, 42. Total 53. 



21. G. vastus, fig. 4, 1 ; fig. 5. 31. Total 32. 



22. G. dilntatus, fig. 5, 2. Total 2. 



23. G. amninola, fig. 5, 12. Total 12. 



24. G. scudderi, fig. 4, 4 ; fig. 5, 14. Total 18. 

 2.5. G. spiniceps, fig. 4, 6; fig. 5, 11. Total 17. 



26. G. notatus, fig. 4. 4; fig. 5, 36. Total 40. 



27. G.p/a^iafiM, fig. 4, 12: fig. 5, 72. Total 84. 



28. G. parrulus, fig. 6, 2. Total 2. 



29. G. alhistylus, fig. 6, 56. Total 56. In five cases the second postanal cell was 



divided. 



