Updates to Discoverlife Guides for Coelioxys, Osmia, Xenoglossa, Peponapis,
We make changes and update the Discoverlife Guides almost on a daily basis, most changes are minor, others, though, are more substantial. To better keep people up to date on changes we will now list the more substantial ones on the listserv periodically. for those of you who are interested in such things.....
Coelioxys - Females - Differentiating C. rufitarse from C. moesta and C. porterae
C. rufitarse vs C. moesta and C. porterae, abdomen, T6, overall profile of the lateral sides of this segment when viewed directly from above - As in the genus in general this is a elongated segment, coming to a narrow point.
C. rufitarse - The overall shape clearly not that of a smooth sigmoid curve, about half way down the sides the outline clearly broken by a sharp angle inward creating distinct obtuse corners, these corners formed by the presence of a wide and deep trough or hollow that cuts into the segment below these corners and runs towards but not past the centerline
C. moesta and C. porterae - In both these species the overall shape is that of a smooth, gentle, sigmoid curve uninterrupted by any angles, although, interior to the sides there may be shallow hollows or indentations of various sorts from about half to one third of the way towards the tip, but these not influencing in any significant way the smooth outline of the segment
Genera Guide - Xenoglossa vs Peponapis - Previous characters depended largely on the presence of a small inner tooth in Xenoglossa mandibles, since this tooth was almost always hidden it wasn't that helpful in differentiating the two genera.
Female, Peponapis vs Xenoglossa
Peponapis - Base of mandibles, clypeus and labrum all DARK
Xenoglossa - Base of mandibles and to more variable extent clypeus and labrum with clearly YELLOW markings
Male, Peponapis vs Xenoglossa
Peponapis - Base of mandibles DARK - First flagellar segment several time SHORTER than second
Xenoglossa - Base of mandibles with clear YELLOW markings - 1st flagellar segment clearly LONGER than second
Osmia - Differentiating O. chalybea from O. texana
O. chalybea vs O. texana - Two very uncommon, large species with a prominent, elevated, forward projecting mound on the clypeus, the front rim of which is emarginated or notched
O. chalybea - Distance between the outside edges of the two lateral ocelli equal to or GREATER THAN the distance between the edge of a lateral ocellus and the compound eye - Lower part of the propodeal triangle so heavily inscribed by microscopic lines that it reflects NO light - Clypeal projection without a small central point - In direct comparison larger, pitting along central line of scutum more widely spaced, and ocelli larger - Comes out in early spring
O. texana - Distance between the outside edges of the two lateral ocelli LESS THAN the distance between the edge of a lateral ocellus and the compound eye - Lower part of the propodeal triangle, while inscribed with some microscopic lines, is light enough that this region clearly REFLECTS some light and is slightly shiny - Clypeal projection with a small central forward projecting point in the middle of the central notch - In direct comparison smaller, pitting along central line of scutum denser with fewer areas of clear gaps, and ocelli smaller - Comes out in summer
O. chalybea vs O. texana - Two very uncommon large species
O. chalybea - T4 with white outer hairs and a patch of distinct BLACK HAIRS in the center - In direct comparison, clearly larger, more southern in distribution, the ocelli diameter larger and the wings darker - An early spring species
O. texana - T4 hairs ENTIRELY WHITE - In direct comparison, clearly smaller, more northern in distribution, the ocelli diameter smaller and the wings lighter, but still at least a little bit smoky - A summer species
Sam Droege sdroege@...
w 301-497-5840 h 301-390-7759 fax 301-497-5624
USGS Patuxent Wildlife Research Center
BARC-EAST, BLDG 308, RM 124 10300 Balt. Ave., Beltsville, MD 20705
In the leaf's veins and midrib,
the mushroom's gill: no irony.
In the stamen and pistil,
the pip of the grape, making
occurs without suffering,
one is led to suppose.
When the fawn sprawled in a thicket
stiffens, a council of birds
descends and pecks
until its chest is crimson.
The badger's project
is isolation: he knows
only to burrow and sleep,
while the spider spins
in a web wider, more intricate
than his, though this crisis
does not cross his mind.
He proceeds without comment.
Then what is one to do
on a night like this, bright almost
as day, when the lavender moon,
burdened with light,
is near enough to brush
the trees and power lines, when this fern
rooted at the road's edge
casts the shadow of an infant's ribs?