THE CANADIAN ENTOMOLOGIST. 105 



NORTH AMERICAN THYSANURA— V. 



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



In a previous paper there were given analytical tables to the genera of 

 the families Aphorouridge and Poduridte ; in the present paper will be 

 found a table to the families and a table to the genera of the Entomo- 

 bryid*. The Smynthuridpe and Papiridae are each represented by a 

 single genus. 



The families recognized can be separated by means of the following 

 table :— 



A. Furcula* wanting Aphoniridce, 



AA. Furcula present. 



B. Furcula attached to the ventral side of the antepenultimate ab- 



dominal segment Podtiridce. 



BB. Furcula attached to the ventral side of the penultimate abdominal 

 segment. 



C. Abdomen elongate, cylindrical, much longer than broad 



Entomobryidce. 



CC. Abdomen globular, but little longer than broad. 



D. Terminal segment of the antennae long, ringed ... Smynthwidce. 

 DD. Terminal segment of the antennae short, with a whorl of hairs . 



Papiriidce. 



ENTOMOBRYIDiE.t 



Antennae with from four to six segments ; eyes present or wanting ; 

 postantennal organ wanting ; abdomen cyclindrical, much longer than 

 broad ; tarsi with two claws ; furcula always present, attached to the 

 penultimate abdominal segment. 



A. Body naked or clothed with hairs. 



B. Antenna four-jointed. 



*Furcula is the name used by Tullberg for the ventral spring, the basal segment is 

 the manubrium, the middle segment the dentes, and the apical segment the mucrone?. 



tSchott describes the following new species from California, and adds several European 

 species: — Entomohrya nivalis, Linn, p. i6. E. imdtifasciata, TuUb. =Z?. decenifas- 

 ciata, Fack, p. 17. E. niarginata, Tullb, p. 17. Sii-a ptcrpiirea, Schott, p. 17. 

 Drepaiiura californica, Schott, p. 19. Orchesella rttfescens, Lub., p. 21. Isotoma 

 viridis, Bour. var. aqiiatilis, Lub. —I. tricolor. Pack, p. 22. /. /a/?w/m, Muller, p. 22. 

 Also the following Poduridse and Aphorurida; : — Achoriites viaticiis, Tullb., p. 23 A. 

 armatus, ^\c.=marmoraHis, Pack, p. 23. Xenylla wariiima, TuWh., p. 24. Lipura 

 inermis, Tullb. =Z. fitnetaria. Pack, \>. 24. 



Schott Beitrage zur Kenntniss Kalifornischen Collembola, Bihang Kongl. Svens, 

 Vet. Akad. Hand. Bd. 17. Afd. IV, No, 8, pp. 1-24, 1891, 



