Sphaerotrypes, Blandford, 1894

Buhroo, Abdul A. & Knížek, Miloš, 2020, New species of Pseudothysanoes Blackman, and Sphaerotrypes Blandford (Coleoptera: Curculionidae: Scolytinae) from Jammu and Kashmir, with biological observations, and a key to South Asian species of Sphaerotrypes, Zootaxa 4808 (1), pp. 141-150 : 148

Key to the South Asian (excluding Southeast Asia) species of Sphaerotrypes

1 Interstriae two times as wide as striae..................................................................... 2

- Interstriae more than twice as wide as striae................................................................ 3

2 Discal interstriae with blunt teeth-like elevations and posteriorly with one row of rounded asperities; elytral apex produced into somewhat bulged elevations........................................................... S. siwalikensis Stebbing

- Interstriae with two irregular rows of scale-like asperities on entire length; elytral apex with two broad and blunt tubercles.............................................................................. S. quadrituberculatus Sampson

3 One or two rows of scale-like erect asperities on interstriae.................................................... 4

- At least three rows of scale-like erect asperities on interstriae (at least on lateral interstriae)........................... 8

4 Interstriae somewhat flat, nearly three times as wide as striae................................................... 5

- Interstriae convex, four to six times as wide as striae......................................................... 6

5 Elytra dull, interstriae with one or two irregular rows of pale scales which are twice as long as wide throughout interstriae; 2–3 and 7–8 join at apex to form two broad elevations on each elytral declivity........................ S. bengalensis Wood

- Elytra semi-shining, interstriae with sparse granules irregularly set in one to two rows on the inner interstriae and in one row on the lateral interstriae.................................................................... S. subtectus Browne

6 Interstriae with row of scale-like asperities throughout its length; interstriae 8 raised into a sinuous ridge on its whole declivital part................................................................................................ 7

- Interstriae with row of scale-like asperities only on posterior two-thirds of length; a prominent sinuate ridge on the declivital part of interstriae 8 which terminates at the end of interstriae 2.................................... S. costatus Wood

7 Broad blunt tubercles between successive scales continue to elytral apex on interstriae 7; larger species (3.0– 3.5 mm)............................................................................................ S. cristatus Wood

- Narrow sharply pointed tubercles on all interstriae; smaller species (1.5–1.8 mm).................. S. ranasinghei Wood

8 Interstriae with erect prominent asperities and densely covered with minute scale-like setae.......................... 9

- Interstriae with dense fine granulation, glabrous, except postero-lateral interstriae remarkably brown with 2–3 rows of light scale-like setae......................................................................... S. limbatus Eggers

9 Interstriae at least four times as wide as striae.............................................................. 10

- Interstriae nearly three times as wide as striae.............................................................. 11

10 Posterior margin of the elytra with somewhat distinct tubercles near apex; minute granules on anterior margin of pronotum; numerous (6–7) scattered transversely set erect setae on either side of median line close to base of pronotum................................................................................................... S. querci Stebbing

- Posterior margin of the elytra without distinct tubercles; no granules on anterior margin of pronotum; only 3 longer transversely set setae on either side nearer to median line close to base of pronotum........................... S. montanus sp. nov.

11 Pronotum 1.4 times as wide as long; frons plano-convex, densely setose with small narrow median line above epistomal mar- gin; body length 3–3.2 mm .............................................................. S. globulus Blandford

- Pronotum 1.7 times as wide as long; frons flat, setose with indistinct median line; body length 2.5–3 mm ............................................................................................... S. coimbatorensis Stebbing