6 T. OKADA 



r. vertical rod of aedeagus (phallic organs). 



s. submedian spine of hypandrium (phallic organs). 



t. anal plate or cercus (periphallic organs). 



u. ventral recurved process of aedeagus (phallic organs). 



v. ventral fragma of novasternum (phallic organs). 



The scales of the text-figures 1-327 : solid line, o-i mm. ; broken line, i-o mm. 



ACKNOWLEDGEMENTS 



The author wishes sincerely to thank Dr. E. B. Basden, Institute of Animal Gene- 

 tics, Edinburgh, for recommending that this material should be offered to the 

 author to study. His hearty thanks are due to Mr. R. L. Coe, British Museum 

 (Natural History), for entrusting the author with this precious material and reading 

 the manuscript, and to Mr. J. P. Doncaster, British Museum (Natural History), for 

 sanctioning the loan of the specimens and for accepting this paper for the Museum's 

 Bulletin. 



He is much obliged to Dr. M. R. Wheeler, University of Texas, for his valuable 

 advice on taxonomic accounts, and also Dr. F. A. Turk, Shang-ri-la, Reskadinnick, 

 Camborne, Cornwall, and Dr. R. H. Cobben, Landourwhogeschool, Wageningen, 

 Netherlands, for their kind help in obtaining literature. He acknowledges grants 

 from the Japan Society of the Promotion of Science, through the courtesy of Dr. K. 

 Dan, Tokyo Metropolitan University, and from the Japan U.S. Co-operative Science 

 Program through the courtesy of Dr. D. Moriwaki, Tokyo Metropolitan University. 



Family CRYPTOCHAETIDAE 

 CRYPTOCHAETUM Rondani 



Cryptochaetum Rondani, 1875 : 167. 



Type-species : Cryptochaetum grandicorne Rondani, 1875 : 167 (Europe). 



Cryptochaetum nipponense (Tokunaga) 

 (Text-figs. 1-5) 



Hippelates nipponensis Tokunaga, 1943 : 1075 (Japan). 



Cryptochaetum nipponense (Tokunaga) Foote and Arnaud, 1958 : 241 (Japan). 

 Cryptochaetum grandicorne Rondani ; Coquillett, 1898 : 340 (Japan) ; Kuwana, 1922 1 : 28 ; 

 2 : 37 (Japan) ; Okada, 1956 : 9 (Japan). [Mis-identification.] 



6". Body about 3 mm. Front large, frontal triangle not sharply pointed anteriorly. Anten- 

 nae slightly shorter than face, apically angular, ending in a minute tubercle. Fore tarsi normal, 

 not dilated. Posterior crossvein sinuate, anterior crossvein level with the second costal break. 

 Rj angulate at middle. Costa extending slightly beyond the end of i? 4 + 5 . 



Taplejung District, damp evergreen oak forest above Sangu, c. 9,200', 2-26.xi.1961, 

 12 cJ (2 cJ hovering in front of eyes) (R.L.C.) ; below Sangu, by stream in shady 

 ravine, c. 6,000', 1 <$, 30.X.1961 (R.L.C). 



Distribution : Nepal (new locality), Japan. 



