BY R. .T. TILLYARD. 535 



LETTERING OF PLATES AND TEXT-FIGURES. 



A, anal veins ; 1A, 2A, 3A,first, second and third anals; 1A-2A, fused 

 first and second anals, forming a Y-vein ; acl , areocel; of, anal furrow; 

 Afi. Af 2 . Af'3. Af 4 . Mg, the five apical forks in Trichoptera; arc arculus ; 

 be, basal cell in Lepidoptera; C, costal trachea or vein ; Cu, cubitus; 

 Cui, C112. its two primary branches, separating - at ctlf, the primary 

 cubital fork; Cui a , Cuit,. the secondary branches of Cui, separating at 

 cnf, the secondary cubital fork; Cu2-lA,fused second cubitus and first 

 analis, forming an incomplete Y-vein; Cut, cubital trachea, in Text- 

 fig.92.; cit-a, cubito-anal cross-vein (but not in Text-fig. 37) ; dcv, distal 

 costal veinlet ; fr, frenulum ; /;;;/, humeral cross-vein ; ia\, ia-2,. first and 

 second inter-anal cross- vein ; icu, inter-cubital cross- vein ; icz>, inter- 

 mediate costal veinlet; im, intermedian cross-vein; ir, inter-radial 

 cross- vein closing radial cell ; ir' , upper inter-radial cross-vein, between 

 El ami K_> : j'b, jugal bristles; jg, jugum; j'l, jugal lobe; M, media; 

 Mi_ 4 , M5, its primary branches, separating at mf, the primary median 

 fork; Mi__>, M 3 _4, the secondary branches of Mi_ 4 , separating at mf , 

 the secondary median fork; Mi, M2, M 3 , M 4 , branches of Mi_ 4 (further 

 branches are indicated by using the suffixes a , bj; M4 — Cui a , the fused 

 stem of the distal Y-vein in Lepidoptera; M5 — Cui. the fused stem of 

 the cubito-median Y-vein j Mt, median trachea in Text-fig. 92; m-cu, 

 medio-cubital cress-vein ; 111c, median cell, closed (bstally by cross-vein 

 im; pt , pterostigma; ptf, pterostigmatic furrow; R, radius; Ri Rs, 

 its primary branches, separating at rf, the primary radial fork ; Ri a 

 Rib. distal branches of Ri ; R^— 3, R4- 5, secondary branches of Rs, sepa- 

 rating at rf , the secondary radial fork; R 2 , R3. R 4 , R5, branches of Rs, 

 (further branches are indicated by using the suffixes a, b,) ; r-111, radio- 

 median cross-vein; re, radial cell (areole in Lepidoptera), closed 

 distally by cross-vein ir ; rf, subcostal retinaculum; rf , subdorsal re- 

 tinaculum ; sa, subanal cross-vein; Sc, subcosta; Sc', its upper basal 

 branch; Sci. Sc^. its distal branches; Sc-R, fused subcosta and radius 

 in Text-fig. 43; Sc-Ri, fused subcosta and first radius; sc-r, subcosto- 

 radial cross- vein; 5A,subhumeral cross-vein; sui , submedian cross- vein; 

 sp, wingspot in Trichoptera, between R 4 and R s . x, true cross-vein in 

 Text-fig. 57, (without macrotrichia) . 



