THE CANADIAN ENTOMOLOGIST. 219 



The species can be easily separated by means of the following key : — 

 A. — Right arm of the forceps with a single large tooth. 



B. — Antennae with forty-five to forty-eight segments 



Saussurii, Humbert. 



BB. — Antennas with about thirty segments subterraneus, Pack. 



AA. — Right arm of the forceps with two large teeth \ antennas with 



twenty-four segments americana, MacG. 



Japyx Saussurii, Humbert. 



Head quadrangular, not broader than long ; antennae 45-48-jointed, 

 segments cylindrical ; prothorax very little more than half as broad as the 

 head, truncate in front ; abdomen broader behind, segments immaculate, 

 segments one to four rounded on the sides behind, fifth and sixth with 

 their hind angles obtuse, the seventh slightly broader than sixth, much 

 broader and overtopping the eighth, emarginate behind, the posterior 

 angles produced in long, slender spines, lateral margins broadly rounded, 

 seventh and eighth subequal in length, the eighth broadly, deeply, acutely 

 emarginate before, the posterior angles not produced, the sides straight, 

 ninth one-third the length of the eighth, posterior angles not produced, 

 tenth slightly shorter than the forceps, the tenth and forceps together 

 slightly longer than the four preceding segments; right arm of the forceps 

 slightly broader than the left, inner margin concave, a large tubercle at 

 middle, two smaller rounded tubercles before the larger tubercle, equi- 

 distant from the larger tubercle and from each other; beyond the larger 

 tubercle the inner margin is slightly convex, with smaller tubercles, which 

 become smaller and smaller, from the large tubercle for two-thirds the 

 remaining length of the arm, the remaining third smooth ; the left arm is 

 broadest at base, with a large tubercle just before the middle, a smaller 

 tubercle midway between the base and the large tubercle, beyond the 

 large tubercle for a short distance there are small rounded tubercles, 

 beyond which the inner margin is crenulate, the apical half beyond the 

 large tubercle is smooth; the antennas, underside of the legs, body and 

 forceps covered with stiff yellow bristles; segments 1-7 with rudimentary 

 appendages, the apical bristle long, stout, apical half brown. 



Length, 20 mm.; length of the antennae, 8 mm.; length of the abdomen, 



13 mm.; length of the last abdominal segment and forceps, 5 mm. 



Habitat — Orizaba, Mexico (Lawrence Bruner). 



Bibliography. 

 Japyx, Haliday. 



1864. — Haliday, Trans. Linn. Soc. Lond., XXIV., 442; pi., XLIV. 



