( cxc ) 



Larval skins, of Dytiscus marginalis, exhibited, clvii, clxi ; of Hydrophilus 

 piceus, exhibited, clxi. 



Lepidoptera, androconia in Orders other than, lvi. 



Lepidopterous family Cossidae and ou the classification of the Lepidoptera 

 observations on, lv, 155. 



Leptothorax acervorum, monstrosity in. exhibited, cliii. 



Lice and trench fever, lvi. 



Longevity of Coleopterous larva, exhibited, lii. 



Lulauguru and St. Michael's Mission, Pierines from, exhibited, cl. 



Lycat mi alcon, life-history of, exhibited, civ ; bred L. avion, exhibited, clxviii. 



Lycaenidae and other butterflies, etc., observations of Dr. Th. Mortensen on 

 the " false head" of, xliv. 



Lycaeuiuae bred from larvae feeding on a single species of Loranthus, S. 

 Nigerian, exhibited, lxxix. 



Macedonian ( >rthoptera, exhibited, clxiii. 



M, chanitis polymnia, darkening of hind-wing in, exhibited, clxix. 



Meeting, discussion as to time of, lvii. 



Microptt rygidae, jugo-frenate genera of, liii. 



Mimetic, association, Pseudacraeas in, exhibited, v ; new form of Pst udacraea 

 poggei mimicking Danaida chrysippus f. dorippus in ex-German East 

 Africa, v; association of Ithomiine butterflies and rare Dioptid moth, 

 exhibited, 1; female forms of Charaxes ethalion and ('. etheocles, and 

 bred male-like females of the latter, neyr, exhibited, lxxix j Hesperid, 

 butterflies of the genus Castnia and a, exhibited, clxiv. 



Mimicry in certain butterflies of New Guinea, on, 118. 



Molippa simillima, a correction, 117. 



Monotomidae, Colydiidae and Notiophysidae from tin' Seychelles and Aldabra 

 Islands, Coleoptera of the Families Ostomidae, 1. 



Monstrosity in Leptothorax acervorum, exhibited, cliii. 



Morpho eugenia, new form of, exhibited, clxviii. 



Mortensen on the "false head" of Lycaenidai and other butterflies, etc., 

 observations of Dr. Th., xliv. 



Musca autumnalis hibernating in a loft in the Isle of Wight, exhibited, xxii. 



Mutation: Coccus viridis, a mutant from Pulvinaria psidi?,siu instance of, 

 130 ; some remarks on paper " An [nstance of," 149. 



Myrmecophile Diptera collected in S. Nigeria, exhibited, xxxix, lxxix. 



J/i/ mi ir, i sulcinodis, ergatandromorph of, exhibited, clvii. 



Naming of local races, subspecies, aberrations, seasonal forms, etc., on the, 

 115. 



Natal during the extraordinary rains of 1917, butterflies captured in, exhi- 

 bited, Ixxxiv. 



Nests from Java, wasps' and ants', exhibited, li. 



Neuroptera from Salonica, exhibited, clxx. 



New Forest, both species of Hemaris from the. exhibited, civ. 



New Guinea, en mimicry in certain butterflies of, 118. 



Nidification of Osmia aurulenta, correction as to, xl. 



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

 xxix ; myrmecophile Diptera collected and the Culicid Toxorhynchites, 

 bred in 8., exhibited, xxxix ; bred from larvae feeding on a single species 

 of Loranthus, Lycaeniuae from S., exhibited, lxxix. 



