50 



minute hooks ; two acute teeth each side on the head, beneath 

 the bifurcated prolongation, one near the labrum, the other 

 further off and nearer the border. 



Mandibles longer than the head, sickle-shaped, pointed, with 

 a stout internal tooth near the middle. 



Maxillas cylindrical, about as thick and as long as the first 

 joint of the antennas, slightly curved inwards, bearing midway 

 a stout external bristle, and near the apex two or three inter- 

 nal and one external bristles, the whole joint scatteringly covered 

 with fine short hairs, the extremity with two appendages, the 

 external, or palpus, of four joints increasing slightly in length, 

 the first two bearing one or two bristles, the last two without 

 hairs, the internal, or maxillary lobe, of two joints, the terminal 

 long, slender and pointed, each with a bristle. 



Labium with an elongated mentum and two diverging, elon- 

 gated, cylindrical palpus-bearing pieces united nearly to their 

 apices by a membrane prolonged beyond them in a fleshy ligula, 

 terminating in a bristle ; labial palpi of two joints, the first once 

 and a half as long as the second. 



Thoracic segments above, horny, flattened, covered with short 

 pubescence. 



Prothorax elongated, narrow in front, gradually enlarged,, 

 widest shortly before the base, where it equals the head in 

 width ; angles rounded ; on each side of the median line several 

 scar-like depressions. 



Mesothorax and metathorax together as long as the prothorax, 

 somewhat broader, narrowed before, with rounded angles; me- 

 sothorax a little longer and narrower than the metathorax ; both 

 with slight depressions on each side. 



Abdomen as long as the head and thorax together, flattened, 

 in the middle as wide as the prothorax, gradually narrowed be- 

 fore and behind ; segments with horny, transverse shields above 

 and below, finely rugose, and scatteringly covered with short, 

 spiny hairs, more conspicuous at the borders ; the terminal, 

 ninth segment shorter and narrower than the others, with a 

 tubular anus, and two very long, filiform appendages of more 

 than twenty-five very unequal articulations, each furnished with 

 a bristle (apex ■wanting'). 



