130 Revieivs — Dr. S. H. Scudder — On Fossil Insects. 



is like the preceding example in the collection of the Eev. P. B. 

 Brodie (Geol. Mag. 1881, p. 295). 



8. This paper is on "Two New and Diverse Types of Carbon- 

 iferous Myriapods ;'" namely Trichmlus villosus, T. nodulosus, and 

 T. ammonitiformis (no longer a myriapod). PaI(r>ocanipa anthrax 

 from the ironstone nodules of Mazon Creek, Morris county, Illinois 

 (illustrated by two plates). 



9. The ninth paper is on "the species of Mylacris, a Carboniferous 

 genus of Cockroaches," of which Mr. Scudder describes six species 

 founded on six detached wings, which are also figured. They are 

 from Mazon Creek, Pittston, and Cannelton, Pennsylvania. 



10. This essay is devoted to " The Earliest Winged Insects of 

 America : a re-examination of the Devonian Insects of New Bruns- 

 wick, in the light of criticisms and of new studies of other Palasozoic 

 types." 



Surely these remains are too fragmentary and obscure to devote 

 more time to their re-examination or lengthy discussion. It would 

 be more profitable to look for better materials to study. 



H. On " Palasodictyoptera : or the affinities and classification of 

 Palaeozoic Hexapoda." 



In this jjaper the author describes and figures (in four quarto 

 plates) a number of new Carboniferous winged insects principally 

 from Mazon Creek, Illinois. One form, Archagogryllns prhciis, is 

 considered to belong to the Orthopteroid-PalasodictyoiJtera ; but the 

 twenty-three other forms named and figured are referred to the 

 Neuropteroid section. The neuration of many of these forms, pre- 

 served in ironstone nodules, is obscure and very difficult indeed to 

 trace with accuracy, and therefore their determination must be to 

 a considerable extent tentative. 



12. *' Winged Insects from a Pala?ontological point of view, or 

 the Geological History of Insects." In this paper the author con- 

 tends that throughout Palasozoic times insects continued as a general- 

 ized form of Heterometabola which he calls Palteodictyoptera, and 

 which had the front wings, as well as the hind wings, membranous. 

 On the advent of Mesozoic times a great differentiation took place, 

 aud before its middle, all of the orders, both of Heterometabola and 

 Metabola, were fully developed in all their essential features as they 

 exist to-day, the more highly-organized Metabola gradually becoming 

 the prevailing type (p. 322). 



lu. The thirteenth paper is on "the oldest-known Insect-larva 

 (Mormohicoides articulatus) from the Connecticut Eiver Kocks " 

 (Triassic).^ (See pi. 19, and woodcut, p. 323.) 



14. This is " A Review of Mesozoic Cockroaches," dealing with 

 the Secondary' forms of Blattarife after the manner in which the 

 Palaeozoic forms were dealt with in Essay No. 4, only in this case 

 cdl the species figured and described are British or European, but 

 almost all are from the Lias or the Purbecks of England. Many of 



^ Originally printed in Memoirs of the Boston Societ}' of Natural History, 

 vol. iii. No. ix. 1884. 



2 Published in the Geol. Mag. Vol. V. 1868, p. 218, without a figure. 



