An Important Insect of the Genus Pseudips: Pseudips mexicanus Hopkins

The paper mainly introduced the morphological characteristics, biological characteristics and control measures of P. mexicanus, in order to provide some reference for quarantine identification of inspection and quarantine departments and further study of scientific research department. 2 Taxonomic status P. mexicanus Hopkins, English name Monterey pine ips, belongs to Pseudips, Scolytinae, Curculionidae. 3 Geographical distribution The pest is mainly distributed in Arizona, Alaska, California, Colorado, Idaho, Montana, Oregon, Utah and Wyoming of the United States. 4 Hosts P. mexicanus can parasitize on many species of pine trees, including Pinus attenuate, P. contorta, P. cooperi, P. durangensis, P. hartwegi, P. leiophylla, P. montezumae, P. muricata, P. radiate and P. pseudostrobus. 5Identification characteristics 5.1 Main characteristics of the genus Pseudips Intemode suture of antennal club strongly anteriorly curved, not diconvoluted; inclined plane steep; wing disc with 3 pairs of teeth, tooth strongly processed, terete. Inclined plane of elytrum narrow, lateral margin with broad protuberances, obtuse rounded, with no more than 3 pairs of teeth; lower margin of inclined plane obtuse rounded, usually less than 3 mm; basal intemode pieces on prosternum short, obtuseangulate; females sometimes with a narrow furrow on facies frontalis ; males with 2-3 pairs of large teeth on incline plane; mallet of antennae contracted, with 2 clear hair cracks at posteáor 1/3 of end; harmful to Pinaceae; body length 1.8 -3.7 mm.. Mallet of antennae flat, hair cracks moderate or distinctly bimodal; lateral margin of inclined plane of elytrum with 1-6 pairs of main teeth, third pair of teeth located at lateral margin or curved inward; elytra ends extended posteriorly and hoázontally; compound eyes small, with smaller width than antennal scape; body length 2. 0 mm. P. mexicanus Mallet of antennae flat, hair cracks moderate or distinctly bimodal; elytra ends extended posteriorly and horizontally; inclined plane of elytrum with 5 pairs of teeth on each side, third pair of teeth located at lateral margin or curved inward; body length 2.