638 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.53. 



is to be looked for, however, especially along the Atlantic coast. 

 In eastern Massachusetts, for example, there are many European 

 species of Collembola that fail to appear in extensive collections 

 from Illinois, Ohio, and New York. 



Cotypes and other specimens have been deposited in the United 

 States National Museum, Washington, District of Columbia; and 

 in the Museum of Comparative Zoology, Cambridge, Massachusetts. 



Order COLLEMBOLA Lubbock 



Suborder ARTHROPLEONA Borner 



Family PODURIDAE Lubbock 



Subfamily Onychiurinae Borner 



Aphorurini Borner 'Olo. 

 Aphorurinae Borner '016. 

 Onychiurinae Borner '01c, '06. 



Pseudocelli present. Eyes absent. Postantennal organs present 

 in most species and usually well developed. Antennal base usually 

 present, distinguished by tubercles smaller than those of the rest of 

 the head. Third antennal segment with a characteristic distal lateral 

 sense organ, consisting of two or three sense clubs, a pair of sense 

 rods, and usually outer papillae with their guard setae. Mouth parts 

 mandibulate; mandibles with apical incisive teeth and with a many- 

 toothed molar surface. Furcula absent, except in genus Teiro- 

 dontoplwra. Anal spines present or absent. Tarsi with one or two 

 claws. Clavate tenent hairs absent. Integument tuberculate. 



KEY TO GENERA OF ONtCHIURINAE. 



Furcula absent. Postantennal organs almost always present. Papillae of sense 

 organ of third antennal segment almost always present, but not more than ten. 

 Body stout or moderately slender. Head broad. Tubercles of postanten- 

 nal organs usually not numerous; simple, or compound. Unguiculus 

 present. Sense clubs of third antennal segment two, straight or feebly 

 bent, smooth, granulate, or tuberculate, not curving toward each other; 

 papillae usually four or five (0-10), with usually the same number of 

 guard setae. Fourth antennal segment with subapical papilla and 

 usually without apical sense club . .Onychiurus Gervais, Bor/ier, p. 639. 

 Body quite slender. Head narrow. Tubercles of postantennal organs 

 usually numerous, always simple. Unguiculus present or absent. 

 Sense clubs of third antennal segment two or three, smooth, curving 

 toward each other, with commonly an accessory ventro-lateral isolated 

 sense club; papillae present (two or three), absent, or represented by a 

 cuticular ridge. Guard setae two to four. Fourth antennal segment 



without subapical papilla, with apical sense club 



Tullhergia Lubbock, Borner, p. 651. 



Furcula present. Postantennal organs absent. Papillae of sense organ of third 



antennal segment 14 or 15 in number Tetrodontophor a Reuter, p. 652. 



