420 TRANSACTIONS OF THE 



linear, a little gibbous at tlie iusertion of the palpi, deeply ciliate 

 with rigid bristles within, and armed with a terminal, distinct, 

 moveable, partly incurved nail. Palpi six, filiform ; anterior 

 pair biarticulate, first joint elongated, rectilinear, a little dilated 

 at tip, almost attaining the apex of the maxilla, second joint 

 linear, incurved over the point of the maxilla and attaining the 

 termination of the nail. Intermediate palpi with the preceding, 

 situate on the back of the maxilla3, quadriarticulate, first joint 

 [407] abbreviated, attenuated at its insertion, second joint cylin- 

 drie, elongated beyond the tip of the maxilla and equa to the 

 two succeeding ones conjointly, third shorter than the terminal 

 one, gradually dilated to the apex, fourth somewhat enlarged to- 

 wards the extremity, truncate. Posterior, or labial palpi pe- 

 dunculated, approximate at base, nearly equal to the pi-eceding 

 pair, triarticulate, first joint minute, attaining the tip of the in- 

 ner division of the mentum, second elongated, cylindric, very 

 liairy above, terminal one glabrous, half as loug as the preceding, 

 truncate at summit. Labium membranaceous, short, concealed 

 behind the mentum. Mentum, corneous, transverse, somewhat 

 concave, trifid, inner division conic, as long or nearly so as the 

 lateral ones, and a little more advanced, lateral ones dilated, and 

 rounded on the external margin, tip conic, the separating sinuses 

 admitting the free motion of the labial palpi. Eyes large, very 

 prominent, reticulate, obovate, distant from the thorax. 



Trunk. — Thorax subquadrate, length and breadth nearly equal, 

 generally with an anterior and posterior impressed, transverse line 

 connected by a dorsal, longitudinal one giving to the disk a bilobate 

 appearance. Scutel triangular, conspicuous, acutely margined. 

 Pectus hairy, punctured or scabrous, brilliant, prominent between 

 the anterior coxce, (sternum) about half as long as the coxa3, con- 

 cave at tip. Epigastrium usually hairy, punctured, brilliant. 

 Elytra rigid, as long as the abdomen, depressed, incumbent not 

 deflected, rounded behind, wider than the thorax, humerus pro- 

 minent, rounded before, suture and margin nearly parallel, disk 

 punctured, granulated, granulas exceedingly minute. [408] 

 Wings, hyaline, with a few nerves ; costal margin strong, stigma 

 dilated, with three hyaline spots. Feet elongated, sub-compress- 

 «^d, slender, formed for running; hind pair longest; anterior 



[Vol. I. 



