HOW TO KNOW THE INSEQS 



40. Mymarldae Very small egg parasites. 



41. Evanlldae (1) The Ensign Wasps. Abdomen short and held erect 



like a flag. 



42. Psammocharldae. . . (64) The Spider Wasps. Slender wasps that provision 



their nests with spiders. 



43. Elmbolemldae .... Rare. 



44. Cleptldae Similar to next family. 



45. Chrysldldae .... The Cuckoo-Wasps. Brilliant metallic green or blue. 



46. Anthoboscldae . . . Very small family. 



47. Sapygldae Black, spotted or banded with yellow. 



48. Thynnldae Not In Iowa. 



49. Tlphlldae (8) Fairly large parasitic wasps. 



50. IJutillldae (13) The Velvet-ants. Females wingless, densely 



clothed with hair. 



51o Scollldae (3) The Scolllds. Large sized lA^asps, parasitic on 



white grubs. 



52. Formlcldae (51) The Ants. Workers wingless. 



53. Bethylldae (2) Small to medium parasitic wasps. 



54. Rhopalosomldae. . . Very small family. 



55. Vespidae (24) The Hornets, etc. 



56. Ampullcldae .... Uncommon; prey on cockroaches. 



57. Drylnldae Small parasitic wasps. 



58. Sphecidae (65) The Typical Sphecld Wasps. The common mud 



daubers and others. 



59. Hylaeldae (7) The Bifld-tongued Bees. Wasp-like bees. 



60. Andrenldae (116) The Andrenlds. Short-tongued, solitary bees. 



61. Megachllidae. . . . (30) The Leaf -cutter Bees, etc. Line their nests 



with neatly cut pieces of leaves or flower petals. 



62. Bombidae (13) The Bumblebees. Large or medium sized. Hairy, 



usually black and yellow. 



63. Apidae (1) The Honey-bees. Only our introduced honey 



maker in Iowa. , 



131 



