NEW BRITISH SPECIES, ETC., IN 1861-62. 83 



P. shjiiaticoTnis, Muls., in our lists, and may be distin- 

 guished from that species by the antenna not being pale at 

 the base ; from P. villondus it may be known by the 

 antennae not being entirely pale. It is rather larger than 

 P. procei'uhis, vv-hich it most i-esembles ; the antennae, how- 

 ever, being longer, elytra wider, more distinctly and sparsely 

 punctuated, and with the rufo-testaceous apical colour ex- 

 tending beyond the middle. 



47. Xantholinus atratus, Heer, Faun. Col. Helv. i. 



246, 7; Kraatz, Ins. Deutschl. ii. 636, 5; E. W. 

 Janson, Proc. Ent. Soc. 3 Feb. 1862, Zool. 7912 

 (1862). 



Discovered by Mr. Janson " in a nest of Formica rvfa^ 

 near Highgate, Middlesex, October, 1856." 



This species, the last in the genus in our lists, is appa- 

 rently abundant, and has been taken plentifully, long ago, 

 also by Dr. Power, who had remarked its differences. 



It may be distinguished from X. pnnctulatMS, Payk., by 

 its smaller size, the finer punctuation of the head, and 

 generally lighter colour, especially in the antennae, which are 

 piceous instead of black. From X. ochraceus, Gyll., which 

 it resembles superficially, it may be known by the lesser 

 number of indentations in the two central thoracic strias, and 

 by the fewer and more remote punctuations on the head. 



48. Lathrobium geminum, Kraatz, Ins. Deutschl. ii. 



673, 3 ; E. C. Rye, Proc. Ent. Soc. 3 Feb. 1862, 



Zool. 7913 (1862). 

 elongatum, Gyll. Ins. Suec. ii. 363, 1 ; Mannerh. 



Brach. 37, 1 ; Heer, Faun. Col. Helv. i. 239, 10. 

 bicolor, Heer (Kraatz, Berl. Zeits. 1861, p. 409). 

 g2 



