Scymnus (Parapullus) Yang, 1978

Scymnus (Parapullus) Yang, 1978: 27 . Type species: Scymnus (Parapullus) secula Yang, by original designation. Paucus Duverger, 1990: 67. Type species: Coccinella abietis Paykull, 1798 .

Diagnosis. Body small, length 2.00– 2.60 mm. Antenna 10-segmented (Fig. 3). Prosternum with distinct intercoxal carinae, almost reaching the anterior margin (Fig. 7). Humeral calli distinct. Abdominal postcoxal line incomplete, never reaching lateral margin of ventrite (Fig. 6). Penis slender with developed capsule (Fig. 19). Parameres of the tegmen usually with two groups of long setae (Fig. 21).

Description. Body elongate oval, moderately convex, with pubescence, widest at the middle of elytra (Figs. 10–17).

Head relatively small; frons broad, weakly convex, finely punctuate, about one-half as wide as head; innerocular margin slightly arcuated. Clypeus slightly incurvate anteriorly. Antennae 10-segmented (Fig. 3), 1st antennomere stout, curved and slightly rounded on outer side; 2nd a little narrower than and two times as long as 1st, 3rd obviously longer than 4th. Antennal club compact, 3-segmented. Labrum transverse with lateral margin almost rounded. Mandible bifid apically with a molar tooth at the base (Fig. 4). Terminal maxillary palpomere stout with lateral margins almost parallel, apical strongly obliquely truncate (Fig. 1). Labial palps 3-segmented, terminal palpomere blunt (Fig. 2).

Pronotum moderately convex, lateral margins curved, at middle of length twice as wide as long. Pronotal hypomeron broad without delimited foveae. Prosternal process moderately wide, quadrate, with nearly parallel carinae, joining anterior margin (Fig. 7). Scutellum small, triangular. Elytra distinctly wider at base than pronotum. Humeral calli rather prominent. Disc finely punctured. Elytral epipleuron narrow and terminated at level of hind coxae. Abdomen with six ventrites. Abdominal postcoxal lines incomplete (Fig. 6), slightly recurved toward the base of ventrite. Leg slender and long, not expanding beyond the external boundary of the body (Fig. 5). Tarsi 4- segmented, claws slender, bifid, the inner tooth shorter and more curved than the outer one.

Remarks. There is little known about the biology of this subgenus. Yu et al. (2000) investigated the natural enemies of the hemlock woolly adelgid ( Adelges tsugae Annand) and found a species, Scymnus (Parapullus) tsugae Yu and Yao, which was collected from the Chinese hemlock ( Tsuga spp.). However, it didn’t record this species as predator of the hemlock woolly adelgid.