Ips species

Buhroo, Abdul A. & Lakatos, Ferenc, 2011, Molecular and morphological diagnostic markers for the Himalayan Ips DeGeer species (Coleoptera: Curculionidae: Scolytinae), Zootaxa 3128 (1), pp. 47-57 : 53

Key to the Himalayan Ips species

Morphological scrutiny with SEM allowed for the identification of differences among the Himalayan species which are reported in the following key.

1. Spine 2 and 3 of elytral declivity ( Fig. 2 ) connected by a tumescent base; 3 the largest but not elongated as in other species (Figs. 5, 8), its apex enlarged into a spade-like club with a constriction at its base ( Fig. 2 ); 4 smaller and always placed midway between 3 and the lower margin. The frons (Fig. 3) and entire lateral margins of the body with dense long erect setae. Body length 3.96–5.28 mm ................................................................. I. longifolia (Stebbing)

- Spine 3 of elytral declivity the largest and extremely elongated (Figs. 5, 8) and spine 4 closer to the lower margin than the third ................................................................................................... 2

2. The frons roughly granulate-punctate with a short, narrow, longitudinal depression in the middle; granulate portion intermingled with some distinct setae ( Fig. 4 ). Elytral declivity concave; spine 3 largest with a knobbed apex; in males the costa of apical margin of elytral declivity more prominent (Fig. 5). Body stout black and its entire lateral margins with fairly dense spiny setae; long setae more or less along the whole declivity. Body length 4.62–5.94 mm ............... I. stebbingi Strohmeyer

- The frons granulate-punctate with an elongated and shining depression in the middle line; the granulate portion somewhat bare and without any setae ( Fig. 6 ). Declivital concavity more vertical; spine 3 is knobbed (Fig. 7), its elongated apex bends downwards in males ( Fig. 8 ). Large beetles, deeply black and lateral margins of the body with sparsely fine setae. Body length 5.94– 6.27 mm ...................................................................... I. schmutzenhoferi Holzschuh

Figures

FIGURE 2. Elytral declivity in I. longifolia. FIGURE 3. Front of head in I. longifolia.

FIGURE 4. Front of head in I. stebbingi. FIGURE 5. Male declivity in I. stebbingi.

FIGURE 6. Front of head in I. schmutzenhoferi. FIGURE 7. Female declivity in I. schmutzenhoferi.

FIGURE 8. Male declivity in I. schmutzenhoferi (Holzschuh, 1988).