i9'j5.] 273 



female of T. luridum by the rather shorter thorax, and the longitu- 

 dinallj depressed vertex, as well as by the form of the base of the 

 pronotum, and by other characters. 



The important character by which this species differs from 

 T. luridum, is the imperfect condition of the centre of the breast. 

 'I'his exists iu both sexes, although (as is usually the case in this 

 genus) there is a sexual difference in the structure at this point, due 

 to the female having the meso-and prosterna more flattened than they 

 are in the male. In the male the front of the mesosternum slopes 

 upwards and no junction with the mesosternal process can be seen. 

 In the female the mesosternal process is broader than in the male, 

 and there is a considerable gap between its apex and the most promi- 

 nent part of the metasternum. 



T. parcum is allied to both T. luridum and T. fuscum. It is well 

 distinguished from the former by the sternal structure, by the much 

 less developed basal margin of the thorax and by the more dense 

 white pubescence on the base of the elytra. It is larger than 

 T. fuscum, and has not the peculiar granular sculpture on the thorax 

 that distinguishes T. fuscum from all the other species. 



T. parcum is at present known only by two specimens in the 

 Crotch Collection of British Coleoptera iu our Museum at Cambridge. 

 They are labelled '" near Manchester, 1865." Inquiry at Manchester 

 has failed to elicit any further information as to their history. 



In addition to 7'. crawshayi and T. parcum, two other species, if 

 not more, of Tetropium have been found in Britain. One of these 

 I believe to be T. gabrieli, recently described by Weise from three or 

 four specimens coming from different localities in Central Europe. 

 It has been captured by Messrs. Bouskell and Donisthorpe, and 

 recorded as T. castaneum (= luridum). 



The other forms were found at Hartlepool in connection with 

 imported timber, by Mr. Gardner, and four specimens have been sent 

 to me by Mr. K. 8. Bagnall. My information as to the forms found 

 beyond Central Europe is at present not sufficient to warrant my 

 dealing with them, and they can only be labelled T. luridum, var. ? 

 They appear to be nearer to specimens from East Siberia than to 

 those that occur in Central Europe. 



A singular confusion has prevailed as to the genus Tetropium, 

 of which only three species from the Palsearctic, and two others from 

 the Nearctic regions have been recognised until the present year. It 

 is therefore worth recording that Mr. Champion has found T. craw- 



