Handbook of Medical Entomology
l. Body of plate distinctly longer than broad;
goblet cells of medium size, usually 17.5u to 35u or 40u in diameter, appearing as medium sized punctuations on untreated specimens, but on the specimens treated with caustic potash they appear very distinct in outline, which is not circular; base of capitulum usually less than twice as broad as long, the postero-lateral angles always distinctly prolonged caudad.