270 MANDIBULATA. — COLEOPTERA. 



rather elongate, slender, more or less pubescent, slightly depressed, usually of 

 sombre hue: legs short; tarsi very slender, simple, basal joint moderate. 



The approximating simple antenna? of the insects contained in 

 this genus, combined with the slenderness of the body, immarginate, 

 very gibbous, thorax, and usually sombre colouring, distinguish them 

 from those of the two preceding genus, as do the slender tarsi from 

 Anathrotus. 



Sp. 1. thoracicus. Niger, glaher, thorace toto rvfo. (Long. corp. 4 lin.) 

 El. thoracicus. Fabricius.—Martyn, Cpl. 31. f. 32.— N. G. thoracicus. Steph. 

 Catal. 125. No. 1274. 



Body, head, antenna?, and legs black : thorax above globose, bright immaculate, 

 red, beneath red, with a longitudinal black streak in the middle : elytra deep- 

 black, striated : claws rufous. 



Known from the other species, which have the thorax rufous, by the superior 

 gibbosity of the latter, the elongate third joint of the antenna?, which last 

 are simple in both sexes and approximating, and by its glabrous body. 



Rare : but widely distributed, occurring within the metropolitan 

 district, in Norfolk, Somersetshire, &c. u Baron-wood, Cumb." — 

 T. C. Heysham, Esq. " Windsor."— Dr. Leach. " New Forest." 

 — L. Rudd, Esq. " Collingbourne-wood." — Rev. G. T. Rudd. 



Sp. 2. ruficollis. Niger, glaher, thorace Iwvi rubro, antice nigro, elytris sub- 



cwruleis, striatis. (Long. corp. 2f— 3 lin.) 

 El. ruficollis. Linne.—Martyn, pi. 30. f. 3.— N. G. ruficollis. Steph. Catal. 



125. No. 1275. 



Shining black : the thorax above smooth, rufous, with the anterior portion 

 black, beneath also rufous, with the anterior edge, and a longitudinal streak, 

 black : elytra bluish-black, rather depressed, deeply striated, with the inter- 

 stices granulated : tarsi slightly rufescent. 



The anterior broad black margin to the thorax at once distinguishes this pretty 

 species from the preceding. 



Very few examples of this very rare species have hitherto been 

 captured in Britain : one of my examples was taken in the neigh- 

 bourhood of London; the insect has also been found on the oak, in 

 Norfolk. 



Sp. 3. Equiseti. Niger, cinereo-pubescens, thorace lavi, pedibus piceis, geni- 



culis tarsisque suhtestaceis. (Long. corp. 3% — 5 lin.) 

 El. Equiseti. Herbst.—N. G. Equiseti. Steph. Catal. 126. No. 1276. 



Black : thickly clothed with a cinereous pubescence ; thorax very convex, with an 

 obscure dorsal channel ; the hinder angles short : elytra depressed, a little 



