1903.] 



31 



the forceps — basis. A penis detached, viewed from above. The hair-lines annexed 

 show corresponding enlargements of jxtn^h inch. Drawn after dissections mounted 

 without pressure in Canada Balsam. 



Woodlands, Seaton, Devon : 



December, 1902. 



ON THE TRICHOPTEROUS QENUS MYSTROPRORA, KLAr.\LEK, 

 BY ROBERT McLACHLAN, F.R.S., &c. 



Amongst some Tricliojiiera collected in South Norway by the 

 Rev. A. E. Eaton in July, 1902, were two $ and several ? of what 

 at first appeared to be a Glossosoma, but with very extraordinary 

 (^ characters in the abdominal parts ; the process on the Gth ventral 

 segment short, and the anal parts symmetrical, including a pair of 

 very large spoon-shaped, or broadly clavate (concave within) inferior 

 appendages. These latter called to my mind figures by my fellow- 

 worker and former pupil, Professor Klapalek of Prague (published 

 with a brief Latin diagnosis in the "Rozpravy Ciske Akad. Cisare 

 Frantiska Josefa, etc." for 1892) of the details of a Bohemian insect, 

 given as 31i/strophora intermedia, g. et sp. n., which was unknown to 

 me otherwise. When examining the only good ^ (the other was 

 shrivelled and immature), I detected a peculiar character in one of 

 the tibial spurs (the inner apical spur of the hinder tibife), which was 

 unusually short, broad, and like a cui'ved blade, slightly ciliate ; at 

 that moment the specimen dropped from my fingers, and the hind- 

 wings and abdomen could not be found ! My friend Professor 

 Klapalek gives (/. c.) a very long and detailed description (in addition 

 to the Latin diagnosis) ; but, most unfortunately, his 

 instincts prompt him to use his vernacular (Czech) in 

 most of his writings, and as this is not understandable by /| 

 any except an infinitesimal fraction of entomologists, <, 

 I called his attention to my discovery, which was new f 

 to him, and he very kindly supplied the drawing re- 

 produced here, taken specially from a peculiar position 

 in order to show more clearly the form of this unusual 

 spur, which is not present in Glossosoma, and is, with the 

 abdominal features, a good distinctive point. I know 

 not at present how to separate the females of 

 Glossosoma and Mifstrophora. Professor Klapalek 

 alludes to some minute neural character which at 

 present I cannot recognise. Mystrophora has no 

 "valve" at the base of the anterior wings of the ^, 

 neither have some species of Qlossosoma. The original 



