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Tolumnia Stål, 1867

Tolumnia Stål, 1867: 515.

Mormoschema Breddin, 1909: 269-270. (syn. by Distant, 1918)

Type Species: Tolumnia: Pentatoma trinotata Westwood, 1837, by subsequent designation (Distant, 1902). Mormoschema: Tolumnia immaculata Distant, 1900, by monotypy.

Included Species:
antennata
Distant, 1902
basalis (Dallas, 1851)
elongata Hasan & Ahmad, 1988
gutta (Dallas, 1851)
horni Breddin, 1909
immaculata Distant, 1900
latipes (Dallas, 1851)
longirostris (Dallas, 1851)
malayensis Hasan & Ahmad, 1988
maxima Distant, 1902
papulifera Bergroth, 1922
southwoodi Hasan & Ahmad, 1988
trinotata (Westwood, 1837)

Comments:
   
After studying many specimens belonging to the genus Tolumnia, I now believe that I can identify most of the common Tolumnia species. I have examined specimens of the following species:

1) antennata Distant, 1902 (type locality = India)

2) basalis (Dallas, 1851) (China)

3) gutta (Dallas, 1851) (China)

4) latipes (Dallas, 1851) (Tenasserim)

5) longirostris (Dallas, 1851) (Philippines)

6) trinotata (Westwood, 1837) (Java)

Species I have not examined:

1) elongata Hasan & Ahmad, 1988 (Malaysia)

2) horni Breddin, 1909 (Sri Lanka)

3) immaculata Distant, 1900 (India, Sri Lanka)

4) malayensis Hasan & Ahmad, 1988 (Sumatra)

5) maxima Distant, 1902 (Tenasserim)

6) papulifera Bergroth, 1922 (Sarawak)

7) southwoodi Hasan & Ahmad, 1988 (Malaya)

    Hasan & Ahmad’s species were based primarily on differences in the spermathecal bulb (having one finger-like projection versus two or more; this is a character that can vary within a single species). Breddin indicated that immaculata may have a shorter ostiolar peritreme (I need to check this). Distant described maxima as being larger, and somewhat similar to Halyomorpha in size and appearance. I have not checked the descriptions of horni or papulifera yet.

Key to the species of Tolumnia I am familiar with

1      Rostrum elongate, reaching well onto the fourth or fifth abdominal sternite; relatively large medial pale spot on anterior disk of pronotum (Philippines)

longirostris (Dallas)

-       Rostrum much shorter, reaching to or at most slightly beyond posterior margin of hind coxae; anterior disk of pronotum lacking medial pale spot, at most irregularly and only slightly pale in this area

2

   

2(1)  All antennal segments black, although basal areas of some segments may be pale (India)

antennata Distant

-       At least segments two and three of antennae pale, segment one usually pale, but may be darkish, segments four and five usually blackish, but each with pale basal area

3

   

3(2)   Tylus usually nearly impunctate, paler in color than juga; apices of anterior tibiae usually distinctly dilated; relatively large pale spot in each basal angle of scutellum; usually with relatively large black spots or bands on legs, especially on joint between femur and tibia, and on apex of each tibia (southeast Asia, Malaysia, western Indonesia)

latipes (Dallas)

–       Tylus usually with some punctures, nearly concolorous with juga; apices of anterior tibiae usually not dilated, if dilated, then only slightly so; basal angles of scutellum with or without pale spots; legs often speckled with brown or black, but usually lacking well defined black spots or bands as described above

4

   

4(3)   Basal angles of scutellum with relatively large pale spots (Java)

trinotata (Westwood)

–       Basal angles of scutellum either lacking pale spots, spots very tiny, or pale area extensive, forming irregular band across base of scutellum

5

   

5(4)   Antennal segment five black on apical half, pale on basal half; dark bands on connexiva relatively broad, each connexival segment divided into thirds - black, pale, black (China, Taiwan)

gutta (Dallas)

–      Antennal segment five black with pale area limited to basal one fourth or less; dark bands on connexiva relatively narrow, pale area taking up at least half of each connexival segment (China, India, Thailand, Philippines)

basalis (Dallas)

 

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David A. Rider
Associate professor of Entomology
NDSU
202 Hultz Hall
Fargo, ND 58105
E-Mail: David.Rider@ndsu.nodak.edu

 
Published by the Department of Entomology 


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