THE GENERAL SUBJECT. 
219 
also an account of the occurrence on the top of another Scotch mountain of a 
species of Hemipteray in some numbers, far from its natural habitat. 
ZouTEVEEN, H. Hartogh Heys VAN. Observations sur les co- 
efficients du vol chez les Insectes. Tijdschr. Ent. (2) vi. 
pp. 20-26. 
The author intimates an intention of extending to the Insecta the plan of ob- 
taining coefficients of flight indicatedbyHartingin Arch. N^erl.iv., by compa- 
ring the length and extent of superficial area of the instruments of flight with 
the weight of the body of different species. IlaYing upon this scheme obtained 
algebraic equivalents for such easily manipulated species as Gryllotalpa vul- 
garis, Mdolontha vulgaris, Triphtvna pronuha, Smerinthus tilim ^ , and Cal- 
lipliora vomitoria, he enunciates the following opinion: — attach a great 
importance to these coefficients ; and I believe that a time will come when 
the scientific description of anj' flying creature will be deemed insufficient if 
they be not therein included.” 
Subsequently (/. a. p. 143) the author gives the results of his calculations as 
Hydrophilm piceus 5 and Gymnopterhus nohilitatus (Dipt.) cf. 
VonVollenhoven (ibid.') remarks upon the influence of sex upon the calcu- 
lation. 
General observations on Entomology are made by Couper, in Canad. Ent. 
iii. pp. 32, 61. 
Natural selection : some general remarks, upholding the Darwinian hypo- 
thesis, are made by Riley upon this subject in iii. Rt5p. Ins. Mo. pp. 169-176 : 
cf. also Reichenbach & Gleisberg, Nunq. Ot. i. pp. 211 & 222 j Ilenslow, 
Nature, v. p. 123; Davis, ibid. p. 161. 
Defensive resources of insects : of. AVarner, Sci. Goss. 1871, pp. 248-262. 
Blood-corpuscles: in Anz. Ak.Wien, viii. pp.2-6, is an abstract of a proposed 
paper by Graber, under the title Ueber das Blut und insbesondere die soge- 
nannten Blutkorperchen der Insecten und einiger anderer Wirbellosen.” 
The author fails to detect any cell-membrane or division of blood-corpuscles 
starting from the nucleus, and is convinced that the crystals in evaporated 
serum are not all of organic nature. Besides fat, which seems an especial 
characteristic constituent of the blood, the substance appears principally to 
contain globuline. 
At p. 872 of the same Bulletin, is a short notice of another proposed paper 
by Graber,' under the title Kritische Untersuchimgen auf dem Gebiete der 
Physiologie und feineren Anatomie der Insecten, und speciell der Pedi- 
culinen.” 
The mobility of spines on eggs (supposed to be an insect’s) found on the 
Mallee-bird, is noted by Davis (Journ. Quek. Micr. Club, 1871, p. 141). 
Galls on Carex : Muller (Pr. E. Soc. 1871, p. x.) briefly describes some 
unknown excrescences of this nature, resembling cocoons of Nematus. 
British gall-insects: Muller (Ent. Ann. 1872, pp. 1-22) gives a summary of the 
recorded observations in Great Britain on gall-producing insects of all orders. 
Instances of Insects in the perfect state retaining the head of the larva are 
referred to in Pr. E. Soc. 1871, p. ii \cf, Zool. Rec. v. p. 193]. 
Insects as personal ornaments : for notes on this subject, cf. Dohrn, S. E. Z. 
xxxii. pp. 424 & 426. 
