REVIEWS 501 
14. Geological History of Cockroaches. By E. H. SELLARDS. (Pop- 
ular Science Monthly, March, 1906, pp. 244-50.) 
15. Haben die Paleozoischen Blattiden 1m Hinterfltiigel ein Praeco- 
staljeld? By DIETRICH V. SCHLECHTENDAL. (Zeitschrift fiir 
wissenschaftliche Insektenbiologie, Vol. 11, March, 1906, pp. 47-50.) 
16. The Wing Veins oj Insects. By C. W. WoopwortH. (Tech- 
nical Bulletins, California Agricultural Experiment Station, Vol. 
1rgO0;spp. 11522) 
1-5. Melander’s paper is largely systematic. Two new genera of 
Hexopoda are described, Petromartus and Protodictyon, and one new 
genus of Arachnoidea, Hadrachne. The arachnid and insect material 
from the Carboniferous of Illinois contained in the Walker Museum of the 
University of Chicago, including two specimens from the Chicago Academy 
of Science, is identified and listed, and the type specimens are indicated. 
The classification of insects proposed by Scudder is followed. Sellards 
identifies the fossils previously known as D7peltis, and referred by Packard 
and others to the Crustacea, as the nymph stages of cockroaches, and gives 
also a description of additional nymph and adult cockroaches, including a 
new genus of very large cockroaches, Megablattina (Sellards, non Brong- 
niart; changed later to Archoblattina). The presence of an ovipositor is 
recognized on certain fossils identified as nymph cockroaches. The second 
paper by Sellards reports the discovery of insects in the Kansas Permian. 
The comparatively rare occurrence of insects in the Permian deposits 
is mentioned. The lack of definite record of insects from deposits 
older than the Carboniferous is noted. Handlirsch’s paper is concerned 
with the Hexopoda in general, and proposes a revised classification for the 
group as a whole. The Hexopoda in this classification fall into four 
classes: Collembola, Campodeoidea, Thysanura, and Pterygogenea. 
Thirty-four orders are recognized, twenty-eight of which (grouped under 
eleven subclasses) are referred to the Pterygogenea. The Paleozoic insects 
are passed in review, and their place in the proposed classification, is 
indicated. Meunier gives a description of a new Coal Measure cockroach 
referred to the genus Efoblattina (E. pygmaea n. sp.). 
6-10. The insects known from the Coal Measures of Belgium are 
referred by Handlirsch to fifteen genera, twelve of which are described as 
new. ‘The insects described are regarded as representative of four orders, 
three of which—Paleodictyoptera, Megasecoptera, and Protorthroptera— 
are exclusively Paleozoic, while the fourth, Blattoidea, continues to the 
present. Eleven genera of insects are recognized from the Russian Per- 
