THE CANADIAN ENTOMOLOGIST. 315 



The genera belonging to this family, as restricted above, can be 

 separated as follows : — 



A. Mouth parts not produced cone-like in front of the head. 

 B. Antennae four-jointed. 

 C. Tarsi with two claws. 



D. Abdomen without anal spines Achorutes. 



DD. Abdomen with anal spines. 



E. Abdomen with two anal spines Schoturus. 



EE. Abdomen with four anal spines... Tet vacant hell a. 



CC. Tarsi with a single claw. 



D. Ocelli twenty-eight or thirty, fourteen or fifteen on each side of 



the head; anal spines wanting Podurhippus. 



DD. Ocelli less than twenty-eight. 

 E. Anal spines wanting. 



F. Furcula long, reaching beyond the apex of the abdo- 



men, arcuate , Podura. 



FF. Furcula short, never extending beyond the apex of the 

 abdomen, not arcuate. 

 G. Legs long, distinctly visible from 



above Pseudachorictes. 



GG. Legs extremely short, not visible from 



above Brachysius. 



EE. Anal spines present. 



F. With two anal spines ..Xenylla. 



FF. With more than two anal spines. 



G. With three anal spines , Tricena. 



GG. With four anal spines Oudema?isia. 



BB. Antennae five-jointed Lubbockia. 



AA. Mouth parts produced cone-like in front of the head. Gnathocephalns. 



Achorutes, Temp. — Ocelli sixteen, eight on each side of the head ; 

 postantennal organ wanting ; antennae short, four-jointed ; body cylin- 

 drical, segments sub-equal ; tarsi with two claws ; anal spines wanting. 

 Type, Achorutes dubius, Temp. 



Achorutes longispinus, . sp. nov. — Body cylindrical, purplish-black, 

 hairy ; head large, rounded in front, truncate behind, prolonged between 

 the antennae, acutely triangular ; eyes on a small black patch almost 

 directly behind the antennae in the middle of each lateral half of the head ; 

 antennae about as long as the head, basal joint globular, minute, incon- 



