14 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 76 



The aspect of this species is one of broadness and flatness. The 

 contiguous or narrowly overlapping elytral scales fail to entirely con- 

 ceal the surface chitin, which is visible between the scales as numerous, 

 minute, shiny-black points. 



EXPLANATION OF PLATES 



Plate 1 



Fig. 1. Mesagroicus herricki, male. 



2. Mesagroicus elongatiis, female. 



Plate 2 



Fig. 1. Mesagroicus elongatus, female; la, fore tarsus; 16, section of an elytral 

 interval, showing scale arrangement. 



2. Mesagroicus minor, female; 2a, fore tarsus. 



3. Mesagroicus hispidus, female. 



4. Mesagroicus oblongus; A, mandibular scar. 



5. Mesagroicus herricki, male abdomen. 



6. Mesagroicus strigisquamosiis, female abdomen. 



7. Mesagroicus minor, female, with deciduous mandibular piece in place. 



8. Mesagroicus ocularis; 8a, section of an elytral interval, showing scale 



arrangement. 

 9-16. Antennae, female, of minor, 9; oblongus, 10; herricki, 11; plumosus, 12; 

 elongatus, 13; hispidus, 14; strigisquamosus, 15; and ocularis, 16. 



17. Diagrammatic sketch to illustrate elytra with a perpendicular basal 



margin. 



18. Same, to show basal margin perpendicular at sides only. 



19-22. Median lobe, side view, of male genitalia of minor, 19; oblongus, 20; 

 herricki, 21; and elongatus, 22; a, dorsal view; b, view of apical K of 

 lobe, from a point directly above this portion. 



23. Fore tibia of plumosus. 



24. Hind tibia of same. 



25. Fore tibia of strigisquamosus. 



26. Hind tibia of same. 



