292 INSECTS. COLEOPTERA. 



last joint of the palpi larger than the preceding, in the form 



of a reversed triangle ; body rounded ; legs spinous. 

 T. aphodioides, Lat. Shining black ; elytra striated ; antennae and 



feet pale brown. Inhabits shores of the Mediterranean. Lat. 



Gen. iv. 379. 



FAMILY III. STENELYTRA. 

 Jaws unarmed, but the mandibles sometimes terminating in a 



point ; penult joint of the tarsi bilobate ; antennas longer than 



the head and thorax in many, filiform or setaceous, and not 



perceptibly perfoliated. 



The insects of this family are provided with wings. In the larva state they liv 

 in woods or under the bark of trees. Many have the elytra soft or flexible. They 

 are divided by Latreille into four tribes. 



TRIBE I. HELOPII. 



Extremity of the mandibles bifid or bidentate ; base of the an- 

 tennae generally covered by the projecting margin of the head ; 

 maxillary palpi longer than the labial, and terminated by a 

 large triangular joint ; joints of the tarsi entire and the hooks 

 of the last simple. 



The body in this tribe is generally oval or oblong, and arched or gibbous on the 

 upper part. The last joints of the antennae are often short and rounded, and the 

 others almost cylindrical. The head is narrower than the anterior part of the tho- 

 rax ; the thighs compressed ; the anterior and intermediate tarsi with five joints, 

 and the posterior with four. They are found in all parts of the world. Some are 

 of brilliant colours. The following are the genera included in the tribe : 



A. Thorax cordiform, truncated posteriorly. 



Gen. HELOPS. 



B. Thorax orbicular. 



Gen. PYTHO, ADELIA, SPH^SROTTJS. 



C. Thorax broader than long, trapezeiform or lunated ; body almost hemispherical,, 

 oval and arched, or oblong oval. 



Gen. AcAKTHOPirs, SPHENISCUS, AMARYGMA, (Cnodulon t Fab.); NILIO. 



D. Thorax longer than broad, square or cylindrical ; body narrow and elongated. 



Gen. STRONGILIA, STENOCHIA, STENOTRACHELTTS, (Dryops, Paykull.) 



Gen. HELOPS, Fab. Lat. 



Antennae filiform, a little longer than the thorax, composed of 

 eleven joints, of which the last are short and round ; man- 

 dibles bifid at the extremity ; palpi four ; last joint of the 

 maxillary ones securiform ; labium slightly notched ; chin al- 

 most square. 



H. hcemorrhoidalis, Fab. Body elongated, convex, of a golden green 

 colour ; antennae inserted under the margin of the hood ; elytra 

 covered with crenated striae, and of a fine metallic blue ; anus 

 pale red. Inhabits India. Nouv. Diet. xiv. 297- 



H. striatus, Oliv. Bronze black above, below chestnut brown ; ely- 

 tra with dotted striae ; tarsi with the four first joints dilated in the 

 middle and hairy below. Inhabits Europe, under the bark of 

 trees Lat. Gen. ii. 188. 



