196 



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

 served a small fly at the burrows of Chlorion ichneiimoneum. Brues 

 (Jour. N. Y. Ent. Soc, Vol. 1 1, 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. 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 

 Melanopliis femiir-mhrum DeG. in provisioning its nest. 



Stizid^ 



Stizus hrcvipemiis Walsh. Digger-wasp. 



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

 Pycnanthemnm flexiiosuni (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, Sphccius 

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

 prniuosa, on which it lays its tgg 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, hrcvipennis and spcciosus prob- 

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

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



HALICTIDiE 



Halicfns ohscurus Rob. 



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

 ers of Bryngimn yuccifolinui (Sta. II) Aug. 13 (No. 55). 



Halictus fasciatus Nyl. 



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

 the flowers of Silphiuin intcgrifolium (No. 48) and from those of 

 Pycnantlicnium flexuostmi or, P. pilosum (No. 52) ; and on goldenrod, 

 Solidago (Sta. I), Aug. 12 (No. 26). 



Halictus vircsccns 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. 2^). 



NOMADIDiE 



Bpeolus concolor Rob. 



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

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



