1 10 Dr. H. Scott's Nola^ on bioloijij of some inquilines and 



of the head, arc flattt'iu'd and spatulale, like tliosc oT tJio 

 tlioracic and abdoiuiiuil sciiiuoiits, oidy narrower in pro- 

 portion to their length. Thc\v re(piire a hi,«;li power for 

 tlieir exact discernment. Two loni; fine si^tae (not spatii- 

 hito) project on either side from the onthno of tlie head, 

 one just behind tlii^ l)ase o\' the iintenna., the other furtlier 

 back; they arise from the lateral or ventro-lateral rejjjions 

 of the head. Two of the flattened hairs also usually 

 ])roject on either side. 'IMie ])ositioii of the setae on the 

 ventral ])arts of the epicranial |)lates is shown in lijji;. 2b. 

 Ocelli: 4: clear, round, colourless spots, raisetl above the 

 surroundini!: surfiu-e, are visible un(hu' a. hij2,h power on 

 (Mther si(U> of the head; two, close t(t<;etlu'r, immediately 

 bi'hind the base of the antenna; the other two, whicli are 

 further a part, one beini; (h»rsal 1<) the otlier, ari^ further back. 

 J'erris speaks of 2 daik-pi^menled ocelh on either side 

 of the head in E. ohsolcia : in K. dejyressa tlu>y are 4 on 

 either side, and I have observed no dark [)i<:;ment in them. 

 Antennae (figs. 2 c, 2 d) f-segmented, basal segment short, 

 broad, soft, and pale (tJiis segment has collapsed some- 

 what in the preparation from which fig. 2c is drawn), 

 second segment narrower but short, third about as long 

 as tlie: two ])n^ceding together, bearing at its apex a conical 

 appendage, ventral to the base of the fourth segment : 

 umhu- a liigli power this appendagi^ aj)pears as a trans- 

 parent cone with a. short, narrow, neck at the base, where 

 it seems to be doubled in on itself : fouith antennal seg- 

 ment narrow, with a long Si'ta and several shorter ones 

 ;it the a])ex. 



MoUTll-l'AKTS. -My study ol tlu'se organs is incom[)iel(', 

 as 1 have been niud)le (o devoli^ suflicient time and material 

 t(» elucidate fidly the h)rm of the hypopharynx and certain 

 other |M)inis; nor is any attempt made to explain the 

 homologit's of all the structures descril)ed. Balsam- 

 preparations of the whole head of three full-grown larvae 

 have been examin«>d, and in a fourth case the parts have 

 been dissected and sc^parately mounliHl. I have not dis- 

 sected the mouth-})arts of the youngest larvae, but from 

 an examination of the miderside of the head viewed as 

 an opaque object, no structural difTereiice from that of 

 the full-grown larva is visible. 



No structural ast/ttniielrj/ has been observed in the head 

 or mouth-parts. Such asynnnetry as appears in ligs. 3 a, 

 5 a, and 5 b, is due iv uneven pressure, or to the specimen 



