196 



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

 served a small fly at the burrows of Chlorion ichneumoneum. 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. 1. pp. 127-130. 1908.) 



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

 Habits of the Solitary Wasps," pp. 1 71-173. 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 

 Melanoplns femur-rubrum DeG. in provisioning its nest. 



Sttzid^e 



Stilus brevipennis Walsh. Digger-wasp. 



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

 Pycnanthemum flexuosum (Sta. I) Aug. 12 (No. 35) ; another was 

 taken by T. L. Hankinson (Sta. I) July 3, 1911 (No. 7665). 



Walsh (Am. Ent., Vol. 1, p. 162. 1869) found this species on flow- 

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

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

 pruinosa, 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, brevipennis and spcciosus prob- 

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

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



HALICTID/E 



Halictus obscurus Rob. 



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

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



Halictus fasciatus Nyl. 



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

 the flowers of Silphium integrifolium (No. 48) and from those of 

 Pycnanthemum flexuosum or P. pilosum (No. 52) ; and on goldenrod, 

 Solidago (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). 



NoMADIDiE 



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 



