186 MUSCA AUSTRALIS MACQ., M. VETUSTISSIMA WALKER. 
™M. domestica Q. 
EXPLANATION OF LETTERING. 
a. anus; ac.g. accessory gland; al. alula; an. anal lobe of wing; 
as. antisquama; a.sp. process of anterior spiracle ; c.e.. clear envelope 
surrounding process of anterior spiracle; cg.g conglohate gland; c.r. 
chitinous rim of spiracle ; cw. cubital cell; d.c. discal cell (=first second- 
medial cell); e¢. eye; f. frons; f.s. frontal stripe; M. medial cell; 
m. medial transverse nervure (posterior cross vein); M 1-+2 median 
longitudinal vein (fused first and second); M.cu. medio-cubital trans- 
verse nervure; mus. muscle; 7.c. nurse cell of ovum; 0. ovary 
od. oviduct; od.c. common oviduct; o.f. ovarian follicles; o.p. ocellar 
plate or tubercle with three ocelli; o.f. so-called optic tubercle; ov. 
ovum; ov.d. developing embryo. J.pe. 5th radical cell; ps. prescutum ; 
R1. first radial longitudinal vein; R 2+3 fused 2nd and 3rd rad. longit. 
vein; R 4+5 fused 4th and 5th; 7.m. radial median crossvein (discal 
nervure, anterior transverse vein); S 2 spiracle of second instar; 8 3. 
spiracle of third instar; sc. scutum; sci. scutellum; sp. spermatheca ; 
sp.p. spiniferous pads; s.s. spiracular slits; tr. trachea; wt. uterus. 
