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Photo#595241
Harpalus longicollis - Harpalus vagans - male

Harpalus longicollis - Harpalus vagans - Male
Tippecanoe County, Indiana, USA
September 15, 2006
Size: 15 mm

Images of this individual: tag all
Harpalus longicollis - Harpalus vagans - male Harpalus longicollis - Harpalus vagans - male

Help: male Harpalus vagans vs male H. actiosus?
Brad, your images do indeed support H. vagans based in part on elytra densely punctate and pronotum with sides convergent toward base. I'm currently examining a male beetle (Virginia) that superficially fits H. vagans like above but the elytra are very shiny (from the observed obsolete or absent microsculpture) as compared to my examples of male H. vagans which do have duller elytral luster from distinct isodiametric microscupture. Also the elytra punctures in my VA specimen appear to be finer than in my other male H. vagans. These are two important characters (luster and puncture size) that help differentiate male H. actiosus from otherwise similar male H. vagans according to Ball & Anderson (1962). However, these authors along with Casey (1914) only use the words "very shiny" for male H. actiosus without addressing microsculpture. So I'm wondering if you could help me by looking at male H. actiosus and male H. vagans to confirm my presumption of the differences in microsculpture. Both species are known in your state of Indiana.
If true, microsulpture would be a foolproof character distinction in males unlike the less reliable published criteria involving body length, body part proportions, and the +/- angular emargination of pronotal front border in H. actiosus. If you are unable to locate H. actiosus, at least tell me if your posted specimen has distict microsculpture. Ball & Anderson describe subtle differences in the internal sac of aedeagus across the two species but I think that might be difficult for me to verify. Just determining the microsculpture in males would be so easy and so reliable (I hope).

I would also like to get your feedback on distiguishing the females. I have a few female examples of both species. The VA specimen is my first male of presumed H. actiosus.

 
male Harpalus vagans
Peter, I have only two male H. vagans and no H. actiosus in my collection. It is clear from examining the two male H. vagans that the elytral microsculpture is quite distinct.

I will be sure to let you know if I come across more.

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