282 GEO. H. HORK. 



Heteryon Sharp. With the exception of the first I find it unsafe 

 to attempt to correlate them with the others owing to the lack of 

 data and the evident uncertainty with which others have been given. 



DACTYIiOSTERNUlfl Woll. 



Mentum quadrate, broader than long, slightly narrower at base, 

 broadly emarginate at apex, the angles rounded, surface broadly 

 concave. Labrum scarcely visible ; maxillary palpi moderate in 

 length, the last two joints equal. Autennte 9-jointed ; tarsi 5-jointed 

 on all the feet, the first joint nearly as long as the next two. Pros- 

 ternum strongly carinate ; metasternum prolonged in a process com- 

 pletely separating the middle legs, the episternum wide, the suture 

 straight ; raesosternum elevated in front of the metasternal process, 

 usually in the form of an arrow-head (except in advedum), the suture 

 between the two sterna well marked. First ventral segment distinctly 

 carinate. Elytra prolonged downward beyond the body. 



Although the more recent authorities, notably Dr. Sharp, have 

 re-united the species separated by Wollaston with Cyclonotum ; it 

 seems better to retain them as distinct, or else go to the other ex- 

 treme of suppressing nearly all the generic names proposed for spe- 

 cies, which would, in the system of Lacordaire, be considered Cy- 

 clonotum. 



There are several characters which seem quite important for use 

 in separating the genera. Cyclonotum has not a well marked carina 

 to the prosternum, nor on the first ventral segment. The antennal 

 club is rather lax and the suture between the metasternum and its 

 side })iece is curved posteriorly. Wollaston indicates a diflerence 

 in the tip of the mandibles, but this is extremely difficult to see 

 without dissection. 



Dactylosternum, on the other hand, has rather a close, but not 

 compact club. The prosternum has a strong carina, and that of the 

 first ventral segment is well marked. The lateral sutures of the 

 metasternum are straight. 



From what I can determine from description and the specimens 

 in hand, Dactylosternum has the elytra striato-punctate, while Cy- 

 clonotum has a confused punctuation with the sutural stria alone 

 evident. 



One species described below has a form of mesosternal elevation 

 differing materially from the usual arrow-head form, so that from a 

 casual observation it would be supposed that the sternal arrangement 



