1913] Life-History of a Bee-Fly. 225 



y. Summary. 



1. The adult fly deposits eggs at the edge of circular 

 openings in sand. In the areas inhabited by the flies (near 

 Chicago) these openings are usually the larval burrows of C. 

 scutellaris Lecontei Hald. p 215. 



2. The sight of the burrow opening, beneath the eyes 

 appears to call forth the egg laying reflex, p. 215. , 



3. The larv£e live as ectoparasites upon the tiger beetle 

 larvae for a little less than one year, growing slowly and moult- 

 ing several times, p. 217. 



4. When the host is ready to pupate, the larva moults, 

 moves to the abdomen and grows to adult size in about six 

 days, p. 219. 



5. When the pupa is fully mature it digs out by means of 

 hooks on its head and backward projecting bristles on the 

 abdomen. The digging is sometimes downward for a time and 

 lasts for more than 24 hours, p. 221. 



6. The parasite is more widely distributed than its host, 

 p. 223. 



VI. Acknowledgments and Bibliography. 



The writer is indebted to Dr. S. W. Williston and Mr. C. A. 

 Hart for the identification of the Bombyliidee, and to the 

 gentlemen named above for the distribution records. 



Aldrich, J. M. A Catalogue of North America Diptera. Smithsonian Miscl. Coll, 



Vol. XLVI, (No. 1444). Cites work on life histories. 

 Dixfour, Leon. '58. Histoire des Metamosphoses du Bombylius major. Ann. Soc. 



Ent. Ser. 3. Tome. 6. pp. 503-511, pi. 13-111. Fig. 1-9. 

 Shelford, V. E. '07. Preliminary Note on the Distribution of the Tiger Beetles 



and its Relation to Plant Succession. Biol. Bull. Vol. XIV, pp. 9-24. 

 Shelford, V. E. '08. Life histories and Larval Habits of the Tiger Beetles. Linn. 



Soc'y's Journal Zoology, Vol. 30, pp. 157-184. 

 Shelford, V. E. '12. Ecological Succession IV. Vegetation and the Control of 



Animal Communities. Biol. Bull. XXIII, pp. 59-99. 

 Townsend, C. H. T. '93. The Pupa of Argyramoeba oedipus Fabr. (Spogostylum). 



Am. Nat. Vol. XXVII. No. 313, pp. 60-63. Jan., 1893. 

 Wickham, H. T. '02. Habits of North American Cicindelidae. Proc. Davenport 



Ac. of Nat. Sci., Vol. 7, pp. 206-228. 

 Williston, S. W. '08. Manual of North American Diptera. New Haven. 



