58 [March, 



46. Porpliyrops frada, Lw. : I feel compelled to refer to this 

 species a pair taken by Col. Yerbury at Nethy Bridge on June 18th » 



1905, and a female from Brodie on June 9th. The male answers in 

 every detail to Loew's description and also to two specimens in 

 Kowarz's collection, except that the remarkable bend or fracture of 

 the cubital vein (whence the name "frada'''') is practically absent. 



47. Syntormoti spicatus, Lw. : This little species is very much 

 like the common S. jjallipes, but has shorter antennse in the male and 

 a ciliated (instead of bifid) thorn beneath the basal joint of the hind 

 tarsi. It was taken by Dr. J. H. Wood at Middle Park Wood, and 

 Stoke Wood, near Tarringtou, in the summers of 1906 and 1907. 



48. S. filiger, nov. nom. {rufipes, Zett.) : This exceedingly rare 

 little species was taken by Col. Yerbury at Walton-on-Naze on 

 August 23rd, and near Woodbridge on August 24th, 1907, while 1 

 took a female at Aldeburgh on September 19th. In 1908 Col. 

 Yerbury took several specimens at Christchurch on May 21st. Its 

 greyish green colour and the peculiar hanging thread-like liristly hair 

 beneath the second joint of the hind tarsi are very distinctive. There 

 can be no doubt about this species being the 8. rtifipes of Staeger, 

 Zetterstedt, and Mik, as I have seen the original Danish specimen and 

 Mik's figures are immistakable, biit to identify it with Meigen's 

 Bhaphium rufipes seems to me a wild stretch of imagination. 



49. Achalcus melanotridms, Mik. — A few specimens of this 

 species were bred from the rotten debris obtained from a hollow in 

 a living horse-chestnut tree at Snailwell in Cambridgeshire in June, 



1906, and two more from similar debris in an elm at Lakenheath in 

 June, 1907. Mik described it in 1878 from specimens fovmd on 

 ulcei'ous trunks of horse-chestnut trees in Vienna. It is easily 

 distinguished from A. cineretis l3y its black bristles, but there are 

 numerous distinctions in the male. The specimen which I previously 

 recorded with doubt under A. cinereus from Thetford belonged to 

 this species. 



50. Thrypticus divisus, Strobl. : The genus Thrypticiis is still 

 very imperfectly known, and only two species are included in Kertesz's 

 " Katalog," and those two are Iraown from japparently less than a 

 dozen specimens. I have this year l)een examining considerably over 

 a hundred British specimens and have come to the conclusion that we 

 possess six or seven species. The first one, T. divisus, Strobl., is one 

 of the most distinct, even though it was subsequently sunk by its own 

 author as a synonym or variety of T. belius. I take its identification 



