( clxxxviii ) 



British Museum, of Natural History and the Hope Collection in the Oxford 

 University Museum, with diagnostic synopses of the genera aud species, 

 notes on Australian sawflies, especially "Authors' Types," and the speci- 

 mens in the, clviii, 247 ; Australian Braconidae in the, 91. 



British Rhopalocera, aberrations of, exhibited, cliii. 



Butterflies, etc., in ex-German East Africa, observations on the seasonal forms 

 of, lviii, lxxxvi ; captured in Naial during the extraordinary rains of 1917, 

 exhibited, lxxxiv ; of the genus Castnia and a mimetic Hesperid, exhibited, 

 clxiv ; of New Guinea, on mimicry in certain, 118. 



Jiutterfly vision, clxxviii. 



Bye-law, proposed alteration of, lxxvi, civ, clix, clxi. 



" Camouflage," modern use of word, lxxvii. 



Cast ilia and a mimetic Hesperid, butterflies of the genus, exhibited, clxiv. 



( 'atagramma, two species of, exhibited, ii. 



Catocaline moth, Eyyholis vaillantina, seized and dropped by a bird at Durban, 

 the conspicuous, xxvii. 



Catochrysops pkasma, not C. parsimon, proved to be myrmecophilous, lxxix. 



Chalcid in undigested seed, exhibited, clxiv. 



Clutraxes ethalion and C. etheocles, and bred male-like females of the latter, 

 new mimetic female forms of, exhibited, lxxix. 



Coccid, rare, exhibited, clix. 



Coccus viridis, a mutant from Pulvinaria psidii, an instance of mutation, 

 130. 



Cockroach, outdoor specimen of, exhibited, clvii. 



Coleoptera, longevity of larva of, exhibited, Hi ; notes on the ontogeny and 

 morphology of the male genital tube in, civ, 223 ; with descriptions of 

 their sexual character, notes on various species of the American genus 

 Astylus, civ; of the families Ostomidue, Monotomidae, Colydiidae and 

 Notiophysidae from the Seychelles and Aldabra Islands, 1. 



Colour-inheritance in Pediculus humanus, experiments in, clvii. 



Colydiidae and Notiophysidae from the Seychelles and Aldabra Islands, 

 Coleoptera of the families Ostomidae, Monotomidae, 1. 



Cossidae ami on the classification of the Lepidoptera, observations on the 

 Lepidopterous family, lv, 155. 



Council, nomination of, clxvii, clxix. 



( 'remastog aster ants in S. Nigeria, Harpagomyia and other Diptera fed by, 

 xxix. 



" Cuckoo-spit'' by Philaenus spvmarius, method of formation of, cliii, clxv. 



Culicid Toxorkynchites bred in S. Nigeria, exhibited, xxxix. 



Danaida clirysippus f. dorippvs in ex-German East Africa, new form of 

 Pseudacraea /i<></tjc/ mimicking, v. 



Danaiue butterfly, the relation of the anal tufts to the brands of the hind- 

 wings observed and the scent perceived in a male, clxxii. 



Dioptid moth, mimetic association of Ithomiine butterflies and rare, exhi- 

 bited, 1. 



Diptera, fed by Cremastogaster ants in S. Nigeria, Harpagomyia and other, 

 xxix; collected in S. Nigeria, myrmecophile, exhibited, xxxix; new to 

 Britain, exhibited, lxxvii ; on new-comers into the tropics and of their 

 gradual diminution, suggested interpretation of the special attacks made 

 by blood-sucking, clxxiv. 



