114 Dr. Sharp's Revision of the 



Ohs. — The variety with black legs is also generally 

 larger, broader, and more robust. The species also varies 

 a good deal in the thickness of the antennae. 



17. Homalota carbonaria. 



Cseruleo-nigra, subnitida, tarsis nigro-testaceis, con- 

 fertim subtilius punctata, fronte impressa ; abdomine 

 supra undique sequaliter confertissime punctate. Long, 

 li lin. 



Mas; abdomine segment© 7° ventrali paulo angustiore 

 et magis producto. 



Fern. ; abdomine segmento 7° ventrali apice rotundato- 

 truncato. 



Tachyusa carbonaria, Sahl. Ins. Fenn. i. 351. T. cceru- 

 lea, Sahl. /. c. H. ripicola, Kies. Stet. Ent. Zeit. v. 317; 

 Kr. Ins. Deutsch. ii. 227. 



This species is so closely allied to H. labilis, that it is 

 sufficient to point out the characters which distinguish it 

 from that common species. H. carbonaria is rather larger, 

 of a distinct blue colour, with the legs and antennae en- 

 tirely blue-black, except that the tarsi, and a small spot 

 at the knees, are dusky testaceous ; the head has a distinct 

 impression in both sexes, and the upper surface is not so 

 shining as in H. labilis. 



Yery rare. I have found it in company with Tachyusa 

 chalybea (which it resembles in colour) on the banks of 

 the Nith, and it occurs also, I believe, on the banks of 

 the Trent. 



Obs. — This species is generally represented in British 

 collections by dark coloured robust varieties of H. labilis. 



18. Homalota plumbea. 



Plumbeo-nigra, sub-opaca, confertissime subtilissime- 

 que punctata, vmdique densius griseo-pubescens, antennis 

 piceis, pedibus fusco-testaceis ; antennis apicem versus 

 vix incrassatis ; thorace subquadrato, coleopteris multo 

 angustiore; abdomine ^qualiter confertissime subtilis- 

 simque punctate. Long. 1| lin. 



Mas; abdomine segmento 7° supra et infra apice 

 rotundato. 



Fe7n. ; abdomine segmento 7° supra obsolete, infra late 

 sed evidenter, emarginato. 



