8 Ins, 
IK SECT A. 
descended from some form allied to Lepisma. The mandibles of the 
Blattidoi are discussed, and the writer concludes that they are compound 
structures, made up of 3 or 4 joints such as exist in Machilis, the struc- 
ture of which is also described. The mandibles of Insects and Myriopods 
do not appear to represent walking legs, but to have resulted from the 
direct modification of such a biramose appendage as is seen in the Nau- 
plius conditioji of many Crustacea. The abdominal appendages of the 
T'hysanura are also discussed, and it is suggested that the limbs of Myrio- 
pods may not be strictly homologous with those of Insects, but may corre- 
spond with the rudimentary appendages of Machilis. The abdominal 
pouches of Machilis, &c., are fully described, and the writer inclines to 
regard them as analogous to the renal or segmental organs of Worms. 
The difference in the position of the genital openings exhibited by the 
different groups, and generally by the opposite sexes of the Arthropoda^ 
indicates that all the members of this sub-kingdom have descended from 
some wormlike creature, provided in every somite of its body with a pair 
of segmental organs or nephridia, and that different pairs of these organs, 
have, in different descendants of this hypothetical ancestor, been con- 
verted into the genital aperture and ducts. The gonapophyses of $ 
Blattidce are homologous with the appendages of the 8th and 9th abdo- 
minal somites in the $ of Machilis. The ex-articulate setose styles 
movably attached to the hinder extremity of the 9th abdominal sternum 
in $ Blattidce, are possibly homologous with the abdominal appendages of 
l^hysanura. 
Mimicry, Habits, Senses, ^e. 
Theory of insect mimicry questioned ; Horn, Tr. Am. But. Soc. vii. p. ii. 
Notes on the inherited and acquired intelligence of Hymenoptera and 
Lepidoptera ; W. v. Reichenau, Ent. Nachr. v. pp. 93-95. 
The degeneration of visual organs in insects, spiders, and Crustacea, 
which live in darkness, is discussed ; Kosmos, iv. pp. 148-153. 
Colour-sense in insects, and its connection with flowers; G. Allen, 
P. R. Inst. ix. pp. 201 & 202. 
Fertilization of flowers by insects, &c. ; Am. Nat. xiii. pp. 648 & 649, 
688-692. Brilliancy of flower-haunting insects ; C. R. Sclater, Ent. xii. 
pp. 130 & 131. Angelica sylvestris very attractive to insects of all orders; 
Beckers, Ent. Nachr. v. p. 257. Bees, &c., stupefied by the flowers of 
Kalmia latifolia. 
Simulation of death by Coleoptera and Arachnida ; 0. R. Slater, Sci. 
Gos. XV. pp. 160 & 161. 
List of insects {Hymenoptera, Lepidoptera, and Diptera, ?) found feed- 
ing on the service-tree ; J. B. Fletcher, Ent. M. M. xv. p. 190. 
Honey without wax, stored by an insect resembling a large mosquito, 
in Ethiopia ; Villiers, Am. Nat, xiii. p. 472. 
Notes on garden insects in 1879 ; J. W. Douglas, Ent. M. M. xvi. 
pp. 115&116. 
Effect of wet season on Insects ; E. A. Fitch, Ent. xii. pp. 281-291. 
