Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Upcoming Events

Information, insects and people from the 2019 BugGuide Gathering in Louisiana, July 25-27

Discussion, insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa

Different Assassin sp. - Rhiginia cinctiventris

Different Assassin sp. - Rhiginia cinctiventris
Arizona Sonoran Desert Museum, Tucson, Pima County, Arizona, USA
July 4, 2009
Size: 21.5mm

Western R. cinctiventris
This is an adult female. See my comments on this image regarding the variation in color pattern in this species.

Moved from Rhiginia.

R. cinctiventris
This too appears to be Rhiginia cinctiventris given the dorsal habitus shot. A ventral view will allow for a final conclusion.

You are so sure
given the long dicussion we had before which did not allow a final conclusion. Please fill us in on your background (bio page) to let us what your authoritative opinion is based on

Systematics of Ectrichodiinae
I am currently a Ph.D. Student working in Ectrichodiinae for three years now. I have accumulated all original and redescriptions, keys, plates, and many Rhiginia spp. For examination. In discussion with other authorities on Ectrichodiinae, there are taxonomic issues evident in groups such as this one. However, given that Dougherty redescribed R. cinctriventris and documented this exact color form, that is what we must go with until a very critical revision has been done for the genus. Like Mr. Swanson, based on morphology, I cannot separate the color morph in question from R. cinctiventris. Looking at other Neotropical genera and species, color variation can be profound. As a previous student of mammology, I learned that coloration should be considered with skepticism in delineating species of some groups. I feel this is the situation with Ectrichodiinae.

Thanks, Michael
that helps to understand your background and expertise. I agree with your conclusions. Please keep the comments and ids coming!

on the identity of Pima AZ Rhiginia
According to the US Heteroptera catalog (1988, Reduviid chapter by Froeschner) there are only 2 species in the continental USA:

R. cinctiventris from NM, TX, and Mexico and the more widespread R. cruciata (FL, GA, IL, IN, LA, MD, MO, NC, NJ, OK, PA, TX, VA, Mexico, Greater Antilles).

Given that one is widespread, and the other is from an adjacent state, distribution is insufficient for certain ID.

According to the reduviid catalog by Maldonado Capriles (1990), the remaining 18 species occur primarily in South America, with a few in Mexico.

But that isn't an ID, is it? A bug in the hand is more identifiable than one in a picture.

I'm not aware of any good keys, but the following (which I have not seen) would perhaps be helpful:
Carpintero, D. J. and J. Maldonado Capriles. 1988. Contributions to the knowledge of American Ectrichodiinae I. Notes about Rhiginia (Hemiptera: Reduviidae). J. Agric. Univ. Puerto Rico, 251-254.

But what an attractive animal, eh?

Seen it...
I have a copy of that publication; it is actually what I was referring to when I said sister-species-couplets-blah-blah-blah. That and Dougherty's review of the American Ectrichodiinae (1995). I remember being a bit disappointed when I read it since the four pages didn't shed much light on this particular problem. I believe it referred strictly to South American species. Nevertheless I will re-check it as I already planned to do this evening.

thanx, Dr. T!
a beauty indeed!

Definitely Rhiginia sp.
and not cruciata but unfortunately I can't tell you which species. It could be cinctiventris (banded venter) or perhaps crucifera. I'm also unsure of the variability of the pronotal coloration in the genus. As far as I know, there are no keys to Rhiginia beyond a few couplets that separate sister species when new ones are described. It's a major short coming in the literature of the field and one I've set my sights on. I will get back to this image when I learn more.

Do you need a ventral shot?
I should probably get one a long as the colors are fresh. As for the gaps in the liteature: I really appreciate your efforts! It would be so nice to put an ID on this pretty bug.

Couldn't hurt...
if it's not much trouble. I'm not sure how helpful it would be as far as a species ID since I'm not even sure if a banded venter is required of cinctiventris. Actually I think the Hidalgo images will eventually turn out to be cinctiventris. My suspicions here are that this will turn out to be yet another new species for the United States. Wow, do I wish I were in the Southwest right now!

diff. subfam.: must be weibch. Rhiginia -- suspect new-to-BG
would be very nice!

We got two yesterday evening
at the Desert Museum, I did not get a photo of the second one. Never saw that sp. here before. I looks different from the southeastern R. cruciata that's in the guide.

exactly my point!

Comment viewing options
Select your preferred way to display the comments and click 'Save settings' to activate your changes.