Subfamily of LamelUcorn Beetles. 611 



from Senegal was described by Fairmaire as XantheUeus 

 pUcifrons and assigned to the Dynastinge. Tliis insect I 

 liave found to be undoubtedly congeneric with the Asiatic 

 species, but, although the external aspect of the insect, and 

 especially the form of the head, with its transverse ridges, 

 suggest the Dynastinse more than any of the Geotrupine 

 subfamilies, this is an illusion, for the position of the 

 spiracles between the abdominal segments and the thick 

 extruded labrum dissipate that idea. With the CoprinDS 

 it has nothing in common but the concealed mandibles 

 and labrum. There is some resemblance to ^gialia, but 

 this is not borne out by a careful comparison of the head and 

 mouth-structure. To the Ochodteinee there is little resem- 

 blance, except in the peculiar branched tibial spurs, and to the 

 Orphninge there is scarcely more. So completely character- 

 istic of these groups and of the Hybosoriiise are the large 

 extruded mandibles and labrum and short flat clypeus, that 

 it seems equally impossible to find a place for this remarkable 

 form in any of them, and the only remaining solution of the 

 problem is the formation of a new subfamily, Dynamopina?. 

 It is not impossible that other enigmatical genera, two or 

 three of which have not yet been carefully studied, may 

 eventually find their proper place in this group. 



The distinctive features may be summarized as follows : — 

 The body is very compact and convex, the legs short, the 

 coxse of each pair contiguous, the femora and tibise very 

 massive, and the tarsi relatively minute. Tiie front tibiae are 

 strongly curved inwards, the outer edge forming three strong 

 blunt lobes. The four posterior tibite are greatly dilated at 

 the ends and each has a strong transverse outer carina. 

 The spur of the front tibia is flat and pectinate along its 

 inner edge, and those of the posterior tibise are laminar, broad 

 at the end, and cleft into radiating lobes, two or three in 

 number in the inner spur and eight or ten in the outer one. 

 The basal joint of the tarsi is long and the claws are very 

 small and slender. The antenuEe are 10-jointed, with a 

 short 3-jointed simple and compact club. The eyes are 

 moderately large, coarsely facetted, and divided by a canthus 

 in front. The head bears two sharp transverse carina} above, 

 the clypeus is produced into a rather sharp point in the 

 middle, and the gense are produced into a pair of long, nearly 

 parallel processes, curving a little upwards, pointed, and 

 highly chitinous. 



The labrum is protruded, thick, short, and broad, studded 

 with stiff bristles and having its lateral angles prominent. 

 The mandibles are very short, completely hidden within the 



