A Guide to the Literature of British Diptera. 85 
40. AusTEN, E. E.: How to collect Diptera (Two-winged Flies), with Notes 
on the Habits of the perfect Insects and Larve. London, British 
Museum (Natural History), 1900, 16 pp. 
41. Howuitt, F. M.: On the Collection and Preservation of Insects. 
Parasitology, Cambridge, vol. iii. pt. 4, pp. 485-489 (1910). 
42. GRAHAM, W. M.: The Photography of Diptera. Bulletin Hnt. Research, 
vol. i. pp. 153-160 (1911). 
42a. SCRIVEN, J. B.: The Preparation of Serial Sections of Insects, based 
upon Experiments with the Blow-fly. Journ. Quehkett Club (2), viii. 
pp. 343-348 (1902). 
IV. Structure and Classification. 
The following papers may be useful as supplementary to the information 
given in general works :— 
43. WALKER, F.: Notes on the Wing-bones of the Two-winged Flies. 
Entomologist, vol. vii. pp. 36-42, 100-102, 126-128, 147-149, 196-198, 
219-221 (1874). The neuration of the wings of genera is illustrated 
by a series of 42 woodcuts, from drawings by A. H. Haliday. 
44, OSTEN-SACKEN, C. R.: An Essay of Comparative Chetotaxy, or the 
arrangement of characteristic bristles of Diptera. Trans. Ent. Soc. 
London, 1884, pp. 497-517. An epoch-making paper of the first 
importance. In it are laid the foundations of a system of nomenclature 
for the bristle arrangement in Diptera, a subject which has since been 
studied in great detail, and which has proved invaluable in taxonomy. 
44a. Suarp, D.: On the Use of the term Tegula in Diptera. nt. Mo. Mayg., 
MEX, pr t2 (1997). 
44b. Meapbz, R. H.: On the Terminology of the Scale-like Organs which 
lie between the roots of the wings and the scutellum of Diptera. 
Ent. Mo. Mag., xxxiii. pp. 29-30 (1897). 
45. OsTEN-SACKEN, ©. R.: On a distinctive character of the Imagos of the 
Suborders of Diptera: Orthorrhapha Brachycera and Cyclorrhapha 
Athericera, introduced by Latreille (1825), but overlooked by later 
authors. nt. Mo. Mag., xxxviii. pp. 228-229 (1902). 
46. WeSCcHE, W.: Modifications of the Legs in some Dipterous Flies. Jowrn. 
Quekett Club (2), viii. pp. 245-250, pls. xiii, xiv. (1902). 
47. Wescuk, W.: Undescribed Palpi on the Proboscis of some Dipterous 
Flies, with remarks on the mouth-parts in several Families. Journ. 
toy. Mier. Soc., 1902, pp. 412-416, pls. ix., x. 
48. Harris, W. H.: The Dentition of the Diptera. Journ. Quekett Club (2), 
Vili. pp. 389-398, pl. xix. (1903), 
