THE CANADIAN ENTOMOLOGIST. 313 



NORTH AMERICAN THYSANURA— IV. 



BY ALEX. D. MACGILLIVRAY, ITHACA, N-. Y. 



Most modem European writers follow Tulleburg in placing all the 

 Collembola in the family Poduridce, and including the Poduridce, Lipuri- 

 dcp. and Anouridce of Lubbock in the subfamily Lipurince. It would 

 seem more natural to restrict the name Poduridce to those genera bearing 

 the saltatory apparatus on the antepenultimate abdominal segment, in- 

 stead of the penultimate, and then to include those genera in which the 

 saltatorial apparatus is wanting under the name Aphoruridce* 



aphoruriD/E, nom. nov. 



Body naked, generally small ; antennae four-jointed ; ocelli present or 

 absent : postantennal organ usually present ; tarsi with one or two claws ; 

 furcula wanting. 



The genera belonging to this family can be readily separated by 

 means of the following table : — 



A. Mouth parts not produced cone-like beneath the head. 



B. Tarsi with two distinct claws Aphorura. 



BB. Tarsi with a single stout claw. 



C. Postantennal organ wanting. r Bourletia. 



CC. Postantennal organ present. 



D. Anal spines present ; postantennal organ trans- 

 verse Tullbergia. 



DD. Anal spines wanting ; postantennal organ circu- 

 lar Anurida. 



A A. Mouth parts produced cone-like beneath the head. 



B. Ocelli present, three on each side of the head Neanura. 



BB. Ocelli wanting Aphoromma. 



Aphorura,^ gen. nov. — Ocelli wanting ; antennae four-jointed; post- 

 antennal organ present ; ocellate punctures at base of the antennas 

 present j lower claw of tarsi distinct. Type, Podura ambulans, Linn. 



Proposed for Lipura, Burm., which is preoccupied in Mammology. 



Bourletia, gen. nov. — Ocelli sixteen, eight on each side of the head ; 

 antennae four-jointed; ocellate punctures, postantennal organ, anal 

 spines, and lower tarsal claw wanting. Type, Anurophorus laricis, Nic. 



* Lipura and Amira are both preoccupied in zoology. 



|a, priv. ; <f>opos, ferens ; ovpd, cauda. 



