Fistulococcus

Key to instars of Fistulococcus species

1. With either fully­developed wings or wing­buds; mouthparts absent ........................... 2

­ Wings and wing­buds absent; mouthparts well developed ........................................... 3

2. Wings fully developed; head, thorax, and abdomen clearly demarcated; with two pairs of simple eyes................................................................................................. adult male

­ Wing­buds present; head, thorax and abdomen not clearly demarcated;simple eyes absent ............................................................................................................... pupa or prepupa

3. Tubular ducts present in a submarginal row and elsewhere on dorsum .. 2nd instar male

­ Tubular ducts absent from dorsum ................................................................................. 4

4. Preopercular pores and preanal disc­pores present...................................... adult female

­ Preopercular pores and preanal disc­pores absent......................................................... 5

5. Submarginal ducts each without satellite pores or setae; each anal plate with an apical seta several times length of plate.......................................................... 1st­instar nymph

­ Submarginal ducts each with satellite pores and setae; each apical seta on anal plates shorter than length of each plate ................................................................................... 6

6. With 1 or more stout seta in submarginal band between adjacent submarginal cham­ bered ducts; anal plates each more than 80 m long; with a total of 15–20 submarginal chambered ducts around margin .........................................................3rd­instar female

­ Stout setae entirely absent from submarginal band between adjacent submarginal