144 [June, 1912. 



ANOTHER HUNDRED NEW BRITISH SPECIES OF DIPTERA. 



BY THE LATE G. H. VERRALL, F.E.S. 



{Continued from Vol. xlviii, page 59) 



52. T. pnllinosus, n. sp. : Eather dull green. This species may be 

 known at once by its duller green appearance ; the face has the upper 

 part^ distinctly duller than in T. Lietus. Discal vein not so curved, 

 and the discal cross-vein hardly more than twice its own length from 

 the wing margin. Arista pointed, and with its basal joint small ; third 

 antennal joint small. Bristles on the head and thorax all yellow ; 

 acrostichal bristles rather strong (especially the hinder ones) and about 

 eight in number. Legs paler than in T. lietus (especially on the tarsi) ; 

 coxse, trochanters, extreme base and about apical third of femora, and 

 anterior tibia; orange to pale brown, hind tibiae slightly darker, tarsi 

 all brownish orange ; front coxae bearing longer and coarser orange 

 pubescence. Genital lamella? yellow, with long thin side-processes 

 which have two very long hairs proceeding from each of them. The 

 female may be icnown by its dullish colour, pointed arista, and straight 

 discal vein. 



Col. Yerbury caught three males and five females at Aviemore on 

 July 18th to 21st, 1905, and one male at Nairn, while a pair occurred 

 at Devereux Pool in Herefordshire on July 5th, 1909. 



These additions will bring the British species of Thrypticus iip to 

 four, but I suspect the existence of three others of which I do not 

 possess sufficient material. I have three males and two females of a 

 very small species allied to T. pollinosus from the New Forest, two 

 very distinct looking males taken by Col. Yerbury at Porthcawl in 

 Jime, 1906, and an apparently very distinct male from the Norfolk 

 Broads (Ormesby), taken by me on June 22nd, 1881. 



T. hellus I possess from numerous localities extending from Dorset 

 to Nethy Bridge, and I have examined nearly fifty specimens. 



53. Medeterus infumahis, Lw. : A few specimens of this species 

 were taken by Col. Yerbury at Nethy Bridge in June and July, 1905. 

 It may be distinguished from the " truncorum " group of species by its 

 entirely black legs. 



54. M. nitidtis, Macq. : Mr. Donisthorpe bred three females of 

 this little known species in 1910, but I do not at present know where 

 the larvae were found. I have not the slightest doubt but that they 

 are British. 



55. M. excellens, Frey. : This very distinct species was taken very 



