LUFFIA. 233 



for the purpose of ensuring priority when it appeared in this volume, 

 and lapidella was cited as the type. The following summary gives the 

 principal characters of the genus : 



Ovum. — Eggs laid in pupa-skin, proportionally large, irregularly oval, pale 

 pearly-white or yellow, shiny, somewhat smooth, exceedingly delicate. 



Case. — Conical, carried more or less uprightly, covered with minute pieces of 

 earth or lichen. 



Larva. — Head black, comparatively large, retractile ; thoracic segments 

 narrow, pro- and mesothorax corneous, metathorax with lateral plates only; 

 abdominal segments bulky ; true legs dark with pale terminal hook ; prolegs short, 

 hooks arranged in horseshoe form (oval broken on inner edge), anal prolegs well- 

 developed ; segmental incisions strongly marked ; lateral flange distinct ; dorsal 

 tubercles as in Macro-Psychids — i external to ii. 



Pupa. — & . Thorax large ; abdomen small ; wings to end of 6th abdominal 

 segment; 3rd pair of legs to beginning of 8th; abdominal segments 8-10 fused ; 

 movable segments 2 (dorsally)-7 ; two dorso-anal spikes (as in Micro-Psychids) ; 

 setae as in larva ; row of anterior dorsal spines on 3-8 (bolder and more regular than 

 in Bacotia) ; no intersegmental spines but rough skin processes ; antennae large and 

 well-developed ; mouth-parts — labia short, divided into two rounded ends without 

 definite division ; maxillae two-thirds length of labium, somewhat triangular. ? . 

 Head and thorax very small ; skin coarse ; abdominal incisions deeply cut ; wings 

 very small, to middle of 1st abdominal segment, 2nd legs nearly to end of wings, 

 3rd legs beyond ; movable segments 2-6 ; anterior dorsal spines 3-7 ; no dorso-anal 

 spikes or recurved hairs ; several rows of sharp conical points on intersegmental 

 membrane ; antennas very short ; mouth-parts — jaws very large, maxillae rounded 

 (without definite palpi), labium short (no division into palpi), length hardly exceed- 

 ing labrum. 



Imago. — 3 . Anterior wings long narrow, apex pointed ; reticulated ; hindwings 

 unicolorous ; antennas 20-jointed, 4th very short and with short pectinations, 5 twice 

 as long as 4, with equally long pectinations ; joints 6-11 long and with rather large 

 pectinations, thence joints shorter, but pectinations shorten more rapidly, on joint 16 

 pectinations shorter than joint, on 19 about half length, 20 simple, each joint with 

 two rows of long narrow scales dorsally, one at middle and one at apex of joint, 

 pectinations arise close to base of joint, basal joint densely scaled ; eyes large, 

 black ; labrum square, below clypeus, with maxillae forming two tubercles at either 

 side ; labial palpi short, 2-jointed, clothed with long hairs ; 1st tibia with spur from 

 middle, half length of tibia ; 2nd tibia with two spurs from extremity, less than half 

 the length of tibia ; 3rd tibia, two pairs of spines one-third length of tibia ; genital 

 appendages — valve cylindrical, harpe with narrow neck for more than one-third of 

 its length, ending in 3 (? 4) claws. ? . Not so curved as in Solenobia or Fumea, 

 nor so straight as Taleporia ; head and thorax dark, plate on metathorax some- 

 what narrowed dorsally; 1st abdominal pale except anterior margin ; large, square, 

 chitinous plate on either side of dorsum from 2-7 ; anal tuft at extremity of 7 ; 

 antennas 12- or 14-jointed ; ? labium with two setas ; tarsi 4-jointed ; scales cofer 

 whole abdomen ; ovipositor 2-jointed with long intersegmental membrane. 



Neukation. — 3 . Anterior wings with secondary cell small, lc represented 

 basally. Posterior icings. — The transverse vein 5-7 across median straight, lb a faint 

 line (Chapman). 



There are only two known species in Luffia, the parthenogenetic 

 L. fercliaulUlla and L. lapidella. One feels inclined to suppose that 

 each of these may be names that cover a group of closely allied forms. 

 The facts collected by Chapman tend to prove either that there is such 

 a group included in the parthenogenetic species, or that each colony has 

 become so specialised by isolation that differences peculiar to each may 

 readily be recognised. Compared with lapidella the following facts 

 are instructive : 



? lapidella — Antennas 14-jointed ; tarsi 4-jointed (3-4 partly anchylosed in 1st 

 logs) ; scales one-fourth of length in breadth, usually truncate. 



? ferchaultella — a. Antennas 12-joiuted ; tarsi 3-, 4-, and 4-jointed respec- 

 tively ; scales narrower than those of lapidella, one-fifth of length in breadth, truncate 

 and very rarely rounded ; forewings narrow but long ; metathorax partly pale 

 (examples from iiroxbourne, Horsham) . 



