Cavariella pustula Essig, 1937

Figs 22, 35C

Cavariella pustula Essig, 1937: 46.

Specimens examined.

Two ap. viv. fems. and two ala. viv. fems. (slides), one ap. viv. fem. (COI: OP956142), China: Beijing, 17.V.2021, No. 50011, on Salix, coll. G.X. Qiao and Y. Xu.

Diagnosis.

ABD TERG VIII with hooded supra-caudal completely hiding the cauda from above (Fig. 22H); PT 0.55-0.91 × Ant. VIb; URS wedge-shaped (Fig. 22D), 0.94-1.36 × HT II; cauda conical and constricted basally, blunt at apex (Fig. 22I), the length 1.45-1.49 × basal width (Essig 1937).

Comment.

The species is first recorded in China and with some variations in China as follows: Ant. III and IV each with 22, 5 circular secondary rhinaria in alatae, but in USA, Ant. III each with 5-9 circular secondary rhinaria arranged in a row in alatae, and Ant IV without secondary rhinaria (Essig 1937).

The species resembles Cavariella aspidaphoides in ABD TERG VIII hooded supra-caudal process; dorsum of body with circular sculptures; but differs from C. aspidaphoides as follows: supra-caudal process only with two setae distally ( C. aspidaphoides: supra-caudal process with two setae distally and 3-5 short setae marginally); URS with one pair of accessory setae ( C. aspidaphoides: URS without accessory setae); PT shorter than Ant. VIb ( C. aspidaphoides: PT longer than Ant. VIb).

Biology.

The species feeds on tender tips of Salix (Fig. 35C).

Distribution.

China (Beijing), Canada, USA.