54f MANDIBULATA. COLEOPTERA. 



tormiiial joint sliglitly securiform: head produced anteriorly: e^ye* promi- 

 nent : t/ionix unequal, foveolated^ narrowed behind : elytra sublinearj some- 

 times slightly attenuated behind : /ci^s slender; femora simple in both sexes : 

 tarsi with the penultimate joint slightly bifid. 



The slender uniform femora of the insects of this genus point out 

 their distinction from their allies, exclusively of the difference in the 

 form and proportion of the articulations of tlie antennae. The 

 genus even as at present constituted requires subdivision ; as the 

 first species has twelve distinct joints to the antennje in the male, and 

 the last species has those organs constructed very like those of the 

 following genus, and the elytra become attenuated, thereby clearly 

 showing the passage between the genera, from which the slenderness 

 and simplicity of the posterior femora remove it. 



A. Elytra sublinear. 



Sp. 1. melanura. Capite thoraceque Jiavo-testaceis , elytris pallidis apice nigris, 

 pectore ahdomineque nigro-piceis : — mas. thorace utrinque macula laterali 

 nigra. (Long. corp. 4 — 9 lin.) 



Ca. melanura. Linnc. — CEd. melanura. Stepli. CataL251. iVb. 2499. 



Head and thorax testaceous-yellow, the latter in the males with a black spot 

 on each side, or almost entirely black : elytra pale, rarely fuscous, with the 

 apex, which is acuminated, black, tinted with violaceous : breast and 

 abdomen pitchy-black; the apex of the last, with the penultimate joint 

 bilobed and concolorous in the males, simple and pale in the females : femora 

 dusky ; tibiae and tarsi dull testaceous ; antennae the same. 



Some examples are more suffused with black, or fuscous, than others; and the 

 insect varies amazingly in size. 



The male has twelve distinct joints to the antennae. 



Abundant in June and July, on the banks of the Thames, from 

 Sheerness to London, and not unfrequently taken on those of other 

 large rivers, as the Severn, Humber, &c. : the larvae feeds upon 

 ship timber, and has been taken abundantly at Chatham. " Deal." 

 Mev. F. W. Hope. '' Portsmouth." — Rev. A. H. Matthews. 



Sp. 2. flavicollis. CEneo-niger, thorace fulvo, elytris coriaceis opacis, lineis 



quatuor elevatis. (Long. corp. 5 — 6 lin.) 

 Ne. flavicollis. Panzer, F. xxiv. /. 18.— CEd. fulvicollis? Steph. Catal. 251, 



No. 2498.— CEd. sanguinicoUis. Curtis, ix. pjl- 390. 



Brassy-black, punctured and slightly pubescent : head greenish : thorax ful- 

 vous, with a black patch in the middle beneath, with three impressed dots, 

 two placed anteriorly and one at the base : elytra dull olive-green, coria- 

 ceous, with three elevated lines on the disc of each; and a fourth somewhat 



