HYDMOSYNE. 1 7^ > 



Labrum subcircular. 



Mandibles (Tab. VII. fig. 4 o) robust, acuminated at the apex ; the 

 inner surface near the base is subsinuate, and forms two obsolete 

 inner teeth. 



Maxillary palpi (Tab. VII. fig. 4 m) elongate, dilated at the apex ; 

 the basal joint is minute ; the second attenuate, thickened towards 

 the apex ; the third joint in breadth double that of the second, 

 gradually inflated towards the apex ; the terminal joint is abbreviated 

 and conical. 



Labial palpi (Tab. VII. fig. 4 I) minute, robust, subcylindrical ; 

 the penultimate joint being slightly thickened at the apex, and the 

 terminal joint more slender. 



Antenna} approximate, situated between and below the inner 

 surface of the eyes, filiform, robust ; the basal joint elongate and 

 broadly dilated (more broadly than in the preceding genus, Ex- 

 artematopus) ; the second narrower, and minute ; the third joint 

 longer than the first, and attenuate ; the fourth and fifth thicker 

 and subequal. 



Eyes large and subglobose, situated at the base of the head, ex- 

 tending laterally not so far as the anterior angles of the thorax. 



Head transverse (slightly produced in front), hardly more depressed 

 in front than the thorax, por red . 



Thorax broader than the head, transverse, obsoletely excavated 

 in front ; the sides subconstricted towards the apex and marginate ; 

 the surface generally finely punctate and glabrous or sparingly pu- 

 bescent. 



Scutellum distinct, triangular. 



Elytra subparallel, slightly broader than the thorax, punctate or 

 punctate-striate, subpubescent or glabrous. 



Legs : the anterior femora robust. The tibice incurved at their 

 immediate base and gradually thickened towards the apex. The tarsi 

 are elongated ; the basal joint is triangular, not quite so broad as the 

 apex of the tibia? ; the second of the same form, but more minute ; 

 the third broad, and almost bilobed; the apical joint is elongate, 

 inflected, and gradually thickened; the terminal claw is bifid, and 

 armed on its inner surface on either side with a second, more minute 

 tooth. The posterior femora are broadly incrassated, gradually 

 tapering towards the apex. The tibial are short, inflected at the 

 immediate apex ; the posterior surface is longitudinally grooved, and 

 terminates in a deeply marginate socket for the insertion of the an- 

 tennae ; this socket commences in an obtuse angle in the margination, 

 is armed along its sides with a closely arranged series of comb-like 

 teeth, and terminates ultimately in a double incurved claw (the outer 



