20 GEO. H. HORN, M. D. 



Mandibles. — Stout, placed nearly vertically, strongly curved, the 

 antero-inferior edge deeply trisulcate, the inner edge obtusely triden- 

 tate, the middle tooth longer. PL iii, figs. 4 and 6. 



Maxillae. — Short and rather stout, the basal piece or support 

 short, semi-corneous ; cardinal piece cylindrical, semi-corneous, ob- 

 liquely truncate at apex and tilled with membrane ; the outer or 

 palpar lobe four-jointed, the first joint longer than the others to- 

 gether, second and third rapidly shorter, fourth small, subulate. 

 Inner lobe extending nearly as far as the palpar lobe, rather slender, 

 indistinctly divided in two unequal parts. The maxilke have a few 

 stiff hairs on the cardinal piece. PI. iii, fig. 5. 



Mentum. — Pentagonal in form, semi-corneous, supported on a 

 semi-membranous extension of the gula, the ligula prolonged in a 

 corneous joint and terminated by two bristles. PI. iii, fig. 5. 



Labial palpi. — Short, two-jointed, the first joint short and stout, 

 the terminal small and conical. 



Prothorax. — Much broader than long, broader behind, arcuate 

 in front, a narrow, semi-corneous space each side, behind which is a 

 deep groove ; surface with erect hairs sparsely placed, directed to the 

 front, and a fine median groove which extends to the end of the 

 eleventh segment. 



Meso- and metathoracic segments. — Similar in form, shorter 

 than the prothorax, each with a transverse crescentic region bearing 

 very short spines with a few longer hairs directed backwards. 



Abdominal segments. — On the upper side the first six segments 

 have a small space each side of the middle bearing very short spines. 



vSiDES of body. — Distinctly Avrinkled, showing the division be- 

 tween the dorsal scutes, the connecting membrane and the ventral 

 plates. 



Underside. — Flatter than the upper surface, the ventral seg- 

 ments 2-7 with a small niammilifonn jjrotrusion on each side bear- 

 ing very short sj)ines, the last two segn)ents with a transverse ridge 

 bearing longer spines. 



Last segment. — With a feebly protrusile pseudo-segment. 



Legs. — Rather short, the anterior pair stouter. Femur longer 

 than the rest of the leg, the tibia broader at apex; tarsi bi-articulate, 

 terminated by a single stout claw. PI. iii, fig. 7. 



Spiracles. — On each side nine, the first situated in the connect- 

 ing membrane at the side of the mesothorax close to the anterior 

 border. The other eight spiracles are smaller and are placed in the 



