198 [August, 



able. We have received at the Museum many specimens of 

 Si/rphidce from Colonel Terbury, amonri; them C. sccevoides ; but it is 

 perfectly certain that this Ghamnesyrphus did not come with them.* 



The fact that a species of Dipfern should occur at Cintra and in 

 Inverness-shire, without occurring in any intermediate locality, must 

 appear very anomalous. But it must be recollected that Chamcesyr- 

 phus is a jrenus rarely met with. Our other species, C. sccevoides. has 

 only been added to our list in the appendix to the eighth volume of 

 Mr. Verrall's British flies, on the evidence of specimens found by 

 Colonel Yerbury in Sutherlandshire. Pelecocern tricincta, the only 

 other allied form, is also very rare at present. And there can be 

 little doubt that many of the vagaries of distribution of insects are 

 apparent rather than real. Our knowledge does not adequately 

 represent the facts. 



There can be but little difficulty in recognising C. lusitanicus. It has the 

 peculiar large lamella-like third joint to the antenna of Pelecocera tricincta, but 

 differs from it by the insertion of the arista, which is not terminal, as it is in 

 tricincta. In C. screvoidex the insertion of the arista is almost on the middle of the 

 upper margin of the third joint. In C. lusitanicus it is nearer to the tip than to 

 the base. Mr. Verrall (British Flies, viii, p. 680) has already called attention to 

 the fact that C. lusitanicus somewhat invalidates the value of the genus Cliamresyr- 

 phus. I think he might have gone further with advantage and placed all the 

 species in Pelecocera. 



Cambridge : June, 1903. 



TETEOPIUM FUSCUM, Fabr. : 



A GENUS AND SPECIES OF LONGICORN COLEOPTEEA 



NEW TO BRITAIN. 



BY T). SnATlP, MA., M.I?., F U.S. 



On June 2Gth last, while going from Brockenhurst to Denny, I 

 captured a specimen of Asemum sfrinttim var. acjre^te. Shortly after- 

 wards my daughter, M. A. Sharp, swept up a specimen of a Longicorn 

 T supposed to be new to us. A description forwarded to the British 

 Museum produced a reply from Mr. C. J. Gahan to the efPect that 

 the species was probably Tetr opium fusciim, Fabr. On returning to 

 Cambridge T find Mr. Gahan's conjecture to be quite correct. Tetro- 

 pium fiiscum somewhat resembles the smaller individuals of Asemum., 

 but the thorax is not transverse, and the eyes are entirely divided, 

 each one consisting of two separate parts. There can thus be no 

 difficulty in recognising this insect. 



* I feel tliat I c.in scarcely pass over tbi.s opportunity of piiMicly acknowledging the great 

 assistance Colonel Yeibury has given us .at Oambridge in the formation of our collection ui 

 British Diptera, and of thanking him for it. 



