Trissolcus erugatus Johnson, 1985

Talamas, Elijah J., Johnson, Norman F. & Buffington, Matthew, 2015, Key to Nearctic species of Trissolcus Ashmead (Hymenoptera, Scelionidae), natural enemies of native and invasive stink bugs (Hemiptera, Pentatomidae), Journal of Hymenoptera Research 43, pp. 45-110 : 67-68

Trissolcus erugatus Johnson

Figures 27 , 60-61

Trissolcus erugatus Johnson, 1985b: 433, 436 (original description, keyed); Sarazin 1986: 980 (type information).

Diagnosis.

Trissolcus erugatus may be distinguished from the most common Southwestern species of Trissolcus discussed here, T. utahensis , by its strongly narrowed gena, angulate vertex, and the lack of rugulae on T2 (occasionally rugulae are present, but these are very short in comparison with those of T. utahensis ). It may be distinguished from T. hullensis by the following characters: metapostnotum invaginated near metascutellum and separating metanotum from propodeum, anterior extension of metapleuron short, not reaching mesocoxa, mandibular teeth shallowly incised; mesopleural carina absent; legs and A1-A6 usually yellow. Trissolcus cosmopeplae may usually be separated from T. erugatus by the strong development of rugulae on T2 and the long anteroventral extension of the metapleuron toward the mesocoxa in the former species.

Trissolcus erugatus seems to be a rather isolated species within the New World fauna of the genus. The narrowed gena allies it with T. hullensis , T. solocis , T. radix , and T. cosmopeplae , but the condition of the metapostnotum, mandibular teeth, and metapleural extension usually distinguish it quite clearly. Specimens from the Southwest are easily identifiable, but variation in color and sculpture in the northern part of its range may result in confusion between this species and T. cosmopeplae .

Link to distribution map.

[http://hol.osu.edu/map-large.html?id=3228]

Associations.

collected on Larrea tridentata ( Sessé & Moc. ex DC.) Coville: [ Sapindales : Zygophyllaceae ]; emerged from egg of Thyanta custator (Fabricius): [ Hemiptera : Heteroptera : Pentatomoidea : Pentatomidae ]; collected on alfalfa: [ Fabales : Fabaceae ]; collected on lodgepole pine: [ Pinales : Pinaceae ]

Material examined.

Paratypes: (1 female, 1 male, 11 sex unrecorded) CANADA: 1 female, OSUC 17813 (BMNH). UNITED STATES: 1 male, 11 sex unrecorded, OSUC 398779-398780 (CNCI); OSUC 77860-77862 (MSWC); OSUC 145560, 75668-75672 (OSUC); USNMENT00903009 (USNM). Other material: (3 females, 2 males, 9 sex unrecorded) CANADA: 4 sex unrecorded, OSUC 398784-398787 (CNCI). UNITED STATES: 3 females, 2 males, 5 sex unrecorded, OSUC 398781-398783, 398788 (CNCI); OSUC 436700 (LACM); OSUC 413943, 523926-523927, 523929, 75667 (OSUC).

Figures

Figures 23 - 28. 26 23 T. strabus, female (BMSB 1203), mouthparts, anterior view 24 T. hullensis, female, (OSUC 523881), head and mesosoma, anterolateral view 25 T. japonicus, female holotype, (USNMENT 00831865), mouthparts, anterior view 26 T. strabus, female, (BMSB 1202), head mesosoma, anterolateral view 27 T. erugatus, female, (OSUC 523929), head mesosoma, anterolateral view 28 T. euschisti, female, (BMSB 1223), head mesosoma, anterolateral view. Scale bars in millimeters.

Figures 60 - 61. 36 Trissolcus erugatus female paratype (USNMENT 00903009) 60 head, mesosoma, metasoma, lateral view 61 head, mesosoma, metasoma, dorsal view. Scale bars in millimeters.