102 COLEOPTERA. 



sionally met with in considerable numbers in the nests of the 

 ant above named. Mr. Smith, however, informs me that 

 despite frequent and assiduous search he succeeded in finding 

 two or three examples only, one of which he kindly ceded 

 to me. 

 6. Tachyusa concolor, Eric, Kraatz ; Waterhouse, Proc. 



Ent. Soc. 3 January, 1859, Zool. 6390 (1859); H. 



S. Gorham, Proc. Ent. Soc. 7 March, 1859, Zool. 



6545 (1859). 

 Homalota concolor, Eric. Gen. et Spec. Staph. 126, 



100 (1839) ; Redtenb. Faun. Austr. Ed. i. 821 (1849). 

 Tachyusa lata, Kiesenw. Stett. Ent. Zeit. v. 315 (1844) ; 



Redtenb. Faun. Austr. Ed. i. 656(1849). 

 Tachyusa concolor, Kraatz, Naturgescb. d. Ins. 



Deutschl. ii. 155, 11 (1856); Fairm. et Laboulb. 



Faune Ent. Franc, i. 376, 10 (1856); Redtenb. 



Faun. Austr. Ed. ii. 124 (1857). 

 Compared with its nearest ally, T. atra, the present 

 insect will be distinguished from it at once by its smaller 

 size, greater relative width, and its abdomen narrowed from 

 the base to the apex ; the male is especially conspicuous by 

 the broad longitudiual channel which traverses the thorax. 



A series of this insect was secured by Dr. Power and Mr. 

 IT. Adams in October, 1858, near Barnes, Surrey, and I 

 received a pair at the hands of the former gentleman a few 

 days subsequent to its capture. Mr. Waterhouse met with 

 a specimen at Highgate in May, 1855, but, possessing only 

 a single male, he attributed the broad thoracic channel to a 

 freak of nature or mere accident, and passed it over as a 

 deformed Homalota until an inspection of Dr. Power's 

 examples of both sexes made him aware of the actual state 

 of affairs, and hence it was not included in the first part of 

 his Catalogue published on the 1st of April, 1858. 



