193 



5, pp. 1 21-122. 1890.) Forbes ('08, pp. 157—160) has found that 

 Tiphia is parasitic upon the grub of the May-beetles (Lachno sterna). 

 The wasp crawls into the ground in search of the larva, stings it, and 

 lays its eggs upon it. It is not unlikely that Scolia has similar habits. 

 The sleeping habits of bicincta and some other Hymenoptera have 

 been described by Banks (Journ. N. Y. Ent. Soc, vol. 10, pp. 127-130. 

 1902), Brues (idem, Vol. 11, pp. 228-230. 1903), and Bradley (Ann. 

 Ent. Soc. Amer., Vol. 1, pp. 127-130). 



Scolia tricincta Fabr. 



One specimen was taken — in the clearing bordering the Bates 

 woods on flowers of Pycnanthemum pilosum (Sta. IV, a) Aug. 23 

 (No. 146). 



EUMENID^E 



Odynerus vagus Sauss. Potter Mud-wasp. 



An oval mud nest, about 18 mm. long and 10 mm. in diameter, was 

 found on a stem of dogbane, Apocynum medium (Sta. I), Aug. 12 

 (No. 46). The nest was placed in a vial; and later, a single wasp of 

 the above species came from an opening which was made at the point 

 where the mud cell was formerly attached to the plant. 



This is a predatory wasp, which stores its nest with caterpillars 

 (Peckhams, in "Wasps, Social and Solitary," pp. 94-95. 1905). 



Vespidje 



Polistes — probably variatus Cress. 



A small nest was observed in a grassy area near Station l,e, but 

 was not secured. The adults feed the young with caterpillars and nec- 

 tar. See Enteman (Pop. Sci. Monthly, Vol. 61, pp. 339-351. 1902) 

 for an excellent account of the habits and life history of these social 

 wasps. 



That these wasps will build their nests in an open area is of inter- 

 est, because the nests are so commonly found under eaves and on the 

 under side of roofs — situations which were originally lacking on the 

 prairie. 



As Walsh stated, the social wasps do not store up food, because 

 "they feed their larvae personally from day to day." 



PSAMMOCHARIDJE 



Priocncmoidcs unifasciatus Say (Priocnemis) . Spider Wasp. 



This wasp was taken in the cleared area bordering the Bates woods, 

 on flowers of Pycnanthemum pilosum (near Sta. IV, a) Aug. 23 (No. 

 146). 



