I’RE 1-ACn. 
The present work is an extension to date of a bibliograpliy pnlilished 
in 1882. It has, liowevex’, been altered in a few iletails, and, beside.s 
being fuller, dilfers from that in being a clas.sed list, the works and 
essays which cover the entire field (which embraces not only insects 
pro])er, but also myriapods and arachni<ks) being placed first, followed 
by the nioie siiecial memoirs gi-onped first by times, next by classes, 
orile.r.s, etc., the classification employed in niy Systematic Review of 
Fossil Insects, being used as a (convenient basis. This will also form 
the basis of the Index to Known Fossil ln.sects, forming a lab'r com- 
plementary bnlletin. The occasion for the puldication of both of these 
at this time is the completion of the first extended account of the Amer- 
ican Tertiary inseiJts given in Vol. XIII of the Hayden series of geologi- 
cal reports, by which the numbers of the European and American insects 
bear for the first time .some .sortof i)roper relation to each other, at least 
ill tlie lower groups. This makes an immediate “account of stock,” to 
einjiloy a commercial term, desirable. 
The points wherein the pre.sent biliography difiers from its predeces- 
sor, liesides its classification and its inclusion of later material, are the 
somewhat fuller and otherwise altered notes, and the di.scontinuauce 
of references to later treatises on the relations which Limulns and Rs 
allies Viear to the arachnids. For the same reasons as before, viz, that 
the .study of the Merostomata is ordinarily confined to a different group 
of paleontologists from those who are engaged on fossil insects, and 
because it would unduly, and, in my opinion, unwisely, extend the scope 
and special purpo.se ol' this bibliograjihy, no attention is given to this 
side of the subject beyond the earlier and largely controversial papers; 
though it is not intended that this action shall be in any seusit an ex- 
jiression of opinion, fou this, not having specially studied the subjects, 
I am not prepared to give. 
1 have thought it best to retain the works upon amber given in the 
earlier bibliography, even when they make only the broadest allusion 
to imsect inclusa, since the fossil insects of the European amber form 
such a iiredominating element in the tertiaries of the Old W urld, and 
I have even added a few later entries. Ferhaps not one-half the works 
or papers concerning amber referred to in bibliographies ai'e procurable 
in this country, and of tho.se seen comjiaratively few contain references 
