386 Mr. Kannav's Century of Insects. 
Prate XXI. Fic. 3. 
Long. corp. lin. 103—12. 
Habitat in Brasilia. D. Hancock. : 
Corpus lineare, subcylindricum, obscuro-viride, mollissime cine- 
reo-pubescens. Caput suborbiculatum. Labrum rotundatum, 
apice emarginatum. Labium integrum, minutum, hirsutissi- 
mum. Mandibule magne, porrectæ, primum divergentes, de- 
mum subito convergentes, unde subfractæ evadunt, intus 
basin versus dente valido acuto armate. Palpi longi admo- 
dum: articulo extimo subovato. Mentum transversum. An- 
tenne nigra, multiarticulate, flabellatæ : ramulis circiter 27,a 
medio basin versus et apicem longitudine sensim decrescentes. | 
Thorax subconicus, antice transversus, postice obsolete trilo- 
bus: lobo intermedio emarginato, lateralibus acutis. Elytra 
- fusca, punctata, margine omni, summo apice excepto, pallide 
favo. Pedes nigri: femoribus, apice excepto, coxisque rufis. 
Tibie apice bicalcaratz. Sternum rufum, acutum, incurvum, 
vix deflexum. Abdomen segmentis plerisque apice obscure 
rufis. 
The Brasil species of this genus vary from those of New Hol- 
land (one of which I shall hereafter have occasion to describe) in. 
having only one tooth near the inner base of each mandible; 
whereas in the latter there are two. The last joint of the palpi of 
this. is cylindrical, while in R. marginata it is subovate or ovato- 
lanceolate. Hence may be formed two natural families in the 
genus, * Mandibulis intus unidentatis ; ** Mandibulis intus biden- 
tatis, 
(Lampyride.) , 
