428 ^Ir. J. W. Slioebotham's Notes on Collembola. 



1. Head hypognathoiis. Ei/es situated near the hind edge of the 



head. Dontes bowed iu the horizontal plane, anuulated 

 towards the end, over-reaching the ventral tube. ^lauubriuni 

 in form recallintr that of the Symphypleoua, with a special 

 medial support-piece of the deutes. 



1. Family Podurid.t. (C. B.), 1906. 



2. ifead obliquely prognathous. With or witliout eyes, these, if 



present, situated in front of the middle of ihe head. Dentes 

 not anuulated, fairly straight, seldom reaching past the 

 ventral tuhe, or the "furcula more or less completely reduced. 

 When the furcula is present the manubrium is simple in 

 form, without the medial support-piece of the dentes. 



2. Family Hypogastrurid^ (C. B.). 



i. ]Mandibles with well-developed molar plate. 



Subfamily Hypogastrurinje, C. B., 1906. 



ii. Mandibles without true molar plate or absent. 



Subfamily Achorctin^, C. B., 1906. 



* Anal segment with undivided supra-anal ralve. With or 

 without furcula. 



Tribe Pseudachorutini, C. B., 1906. 



** Anal segment with double-lobed broader supra-anal valve. 

 W^ithout furcula. 



Tribe Achorutini, C. B., 1906. 



b. With psendocelli. Without eyes. The sense-organ on antenna 

 III. provided with from 2—3 sense-cones, and often at the same 

 time with outer papillre and protecting bristles, in addition to 

 the sense-rods. Post-antennal organ generally well-developed. 

 Autenual segment 4 generally with subapical sense-pit 

 {=^Lipuridce, Lubbock, 1869'.) 



3. Family ONYCHiURiDiE (Lbk., C. B.). 



II. Terqum of the pi-othorax ahoays membranous and toithoiit hairs. 

 Furcula "generally present, and in tlie more recent forms of the 

 group pushed analwards. Integument generally smooth, mostly 

 with sclerites. Ventral tube short or elongated, sometimes with 

 a lateral blind sac. Manubrium ventrally, generally with hairs 

 or scales, seldom naked. 



Section Entomobryomorpha, C. B., 1913. 



a. Trochanteral organ absent. Ventral edge of the claw simple, 

 without groove. 



1. Third and fourth abdominal terga of nearly equal length or 

 the 4th longer, sometimes this (the 4th) fused with the .^th 

 and 6th (without scales^). Naked or ciliated sensory setse 

 ( = bothriotriche) present or absent. 



4. Family Isotomid^ (SchfiTr., C. B., 1896-1903.) 



' This should be 1870. Lubbock's "Notes on the Thysanura — 

 Part 4," was published in 1870, not 1809.— J. W. S. 



^ This is as given by Bonier (1913 i); but, to include the genus 

 Oncopo(hira, Carl & Lebed., it slioiild now read " Scales nearly always 

 absent, when present thev are without longitudinal ribs." — J. AV. S., 

 1914. 



