196 



viviparous. Cf. Aldrich ('05, p. 476). The Peckhams ('98, p. 37) ob- 

 served a small fly at the burrows of CJilorion ichnciiinoncum. Brues 

 (Jour. N. Y. Ent. Soc, Vol. 11, p. 228. 1903) has observed this species 

 near Chicago sleeping in sweet clover. ( See also Bradley, in Ann. Ent. 

 Soc. Amer., Vol. i. pp. 127-130. 1908.) 



For the habits of this species see the Peckhams, "Instincts and 

 Habits of the Solitary Wasps," pp. 171-173. This species provisions its 

 nest with the Carolina locust, Dissosteira Carolina. Coquillett (Insect 

 Life. Vol. 7, p. 228, 1894) says that this species shows a preference for 

 Melanopliis femur-rubrum DeG. in provisioning its nest. 



Stizid^ 



Stilus hrevipennis Walsh. Digger-wasp. 



A single specimen of this large wasp was taken on flowers of 

 PycuantJicmum flcxuosuin (Sta. I) Aug. 12 (No. 35) ; another was 

 taken by T. L. Hankinson (Sta. I) July 3. 191 1 (No. 7665). 



Walsh (Am. Ent., Vol. i, p. 162. 1869) found this species on flow- 

 ers of the wild parsnip at Rock Island, 111. An allied wasp, Sphcciiis 

 speciosiis Drury, preys upon the cicada or dog-day harvest-fly, Cicada 

 pniiiiosa, on which it lays its egg and upon which its larva feeds. Con- 

 sult Riley (Insect Life, Vol. 4, pp. 248-252. 1891) for an excellent 

 account of this wasp. As Walsh infers, hrevipennis and speciosns prob- 

 ably have similar habits. A tachinid fly, Scnotainia trilineaia V. d. 

 W., has been bred from the nest of speciosns (Coquillett, '97, p. 20). 



HaLICTID/E 



Halictus obsciirus Rob. 



A single specimen was taken — on the Loxa prairie from the flow- 

 ers of Bryngium ynccifolium (Sta. II) Aug. 13 (No. 55). 



Halictus fasciatns Nyl. 



This bee was taken Aug. 13 on the Loxa prairie (Sta. II) from 

 the flowers of SilpJmini integrifoliuni (No. 48) and from those of 

 Pycnanthemum flexiiosmn or P. pilosiini (No. 52) ; and on goldenrod, 

 Soli dago (Sta. I), Aug. 12 (No. 26). 



Halictus virescens Fabr. 



A single male of this small bee, with metallic green head and 

 thorax, was taken on flowers of verbena (Sta. I) Aug. 11 (No. 23). 



NOMADID^ 



Bpeolus concolor Rob. 



This species was taken on the heads of the cone-flower, Lepachys 

 pinnata (Sta. I, e), Aug. 8 (No. 8) ; very abundantly from flowers of 



