318 THE CANADIAN ENTOMOLOGIST. 



Tricena, Tullb. — Ocelli sixteen, eight on each side of the head ; 

 postantennal organ wanting ; antennae four-jointed, conical ; tarsi with a 

 single claw ; furcula extremely small, papilliform ; anal spines present, 

 three. Type, Tricena mirabilis, Tullb. 



Oudemansia, Schott. — Ocelli sixteen, eight on each side of the head ; 

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

 cal, segments subequal ; tarsi with two claws ; anal spines present, four, 

 arranged in a circle around the apex of the abdomen ; furcula not attain- 

 ing the ventral tube. Type, Oudemansia ccerulea, Schott. 



Entom. Tids., XIV., 1893, 174 ; pi., II., 1-7. 



Zubbockia, Haller. — Antennae five-jointed, longer than the body ; all 

 the tarsi with tenant hairs, small on the front and middle pairs ; anal 

 spines present, two ; furcula small ; body cylindrical, segments subequal. 

 Type, Lubbockia coerulea, Haller. 



Mittheil. Schweiz. Entom. Ges., VI., 1880, 4. 



Gnathocephalus* gen. nov. — Ocelli sixteen, eight on each side of the 

 head ; postantennal organ wanting ; antennae short, conical, four-jointed ; 

 body cylindrical ; tarsi with a single claw ; anal spines wanting : furcula 

 short, not attaining the ventral tube ; mouth-parts folded together in the 

 form of a tube and projecting in front of the head. Gnathocephalus com- 

 plexus, sp. nov. 



Gnathocephalus complexus, sp. nov. — Body robust, broadest behind, 

 bluish-black, a row of paler spots down each side, and a few scattered 

 hairs on the caudal end ; head small, triangular, strongly produced 

 between the antennae, broadly truncate in front ; eye spot small, on a 

 raised tubercle ; antennae slightly longer than the head, basal segment a 

 little longer than broad, broadest at middle, second segment as broad as 

 the first and slightly shorter; third and fourth segments sub-equal, longer 

 than the first and second, and much narrower, the suture between them 

 not distinctly indicated ; legs long and slender, with lighter markings and 

 scattered regularly placed bristles ; tenant hairs wanting ; claws stout ; 

 furcula short, stout ; manubrium half as broad as the abdomen, nearly as 

 broad as long, slightly incised between the dentes ; dentes two-thirds the 

 length of the manubrium, cylindrical, narrowed at apex; mucrones one- 

 half the length of the dentes, slightly arcuate, without teeth. Length, 

 3-4 mm. 



Habitat : Olympia, Washington. (Trevor Kincaid, collector.) 



*Fvddos, maxilla ; Ke</>aAbs, caput. 



