Taken from:
R. M. Bohart and L. S. Kimsey. 1982. A Synopsis of the Chrysididae in America North of Mexico.
Chrysis cembricola Krombein
(Fig. 207)
Chrysis cembricola Krombein 1958:53. Holotype female, Lost River State Park, West Virginia (USNM).
Discussion: This species is the smallest of the coerulans group with a slender body and modal length of about 6.0 mm. The most diagnostic character is the short ocellocular distance as in fig. 207 (OOD 1.5-1.8 LOD). Other features are: large black spots on S-II, short T-III teeth with median notch in female unusually shallow, LID narrower than eye height (fig. 207), and S-III mostly blue or green, T-II somewhat polished posteriorly, male S-VIII and paramere similar to coerulans (figs. 274, 275).
Host: Symmorphus canadensis (Saussure) nesting in wood borings (Krombein 1958, 1967).
Material examined: 14 males, 28 females including type. In addition R. M. Bohart has determined and returned an additional 97 males and 104 females. Some of these may be small and slender coerulans. These should have the ocellocular distance checked.
Distribution: transcontinental in U.S. and Canada. It is found in Upper Austral to Canadian Life Zones.
Species group of Chrysis coerulans Fabricius
Diagnosis: Male F-I longer than F-III and about 1.5-2.0 times as long as wide, female F-I 2.5-3.0 times; subantennal distance usually a little over 1.0 MOD but not more than 2.0 MOD; transverse frontal carina rather regular and complete (except in schusteri), without backward branches, not incurved below; genal carina separated from eye; midocellus not lidded; mesopleuron and metanotum rather simple; T-II nearly always with a polished median longitudinal ridge on at least a part of tergum; T-III distally with a simple edge and four teeth, laterally a little irregular but usually essentially straight except for slightly outcurved distal tooth.
Included species: apontis Bohart, cembricola Krombein, coerulans Fabricius, inflata Aaron, moorei Bohart, nitidula Fabricius, parkeri Moore, schusteri Bohart and violacuna Bohart.
Discussion: The median ridge or keel on T-II is a useful character but it is neither exclusive nor universal in the group. All species are four toothed, have the distal margin of T-III single, and the midocellus not lidded. Males have F-I longer than F-III. The group contains C. coerulans, one of the commonest most widespread, and variable species of Chrysididae in North America. As far as known, Eumenidae serve as hosts for species in the group. Male S-VIII, as shown for coerulans (fig. 275) is much the same for all species. The paramere is practically identical also (fig. 274) except for apontis and parkeri where it is greatly broadened (figs. 272, 273). The more slender coerulans form of paramere is quite similar to that of the European generotype, ignita Linnaeus.
Key to Chrysis coerulans group
1. Brilliant violet red reflections across T-III bordering pit row anteriorly, or basolaterally
on T-III, or on T-I above basal insertion …………………………………………………2
Brilliant violet red not present …………………………………………………………4
2. Violet red bordering pit row anteriorly (fig. 219) …………………….nitidula Fabricius
Violet red sometimes visible in pit row and beyond but not as band above pit row …..3
3. Violet red on T-I above basal insertion; median ridge of T-III pit row usually absent,
resulting in a median pit which is polished and reddish purple; no specific green and violet red spot on T-III basolaterally …………………………………….violacuna Bohart
Violet red absent on T-I above basal insertion; median ridge of T-III pit row present and dividing row into two series; a green and violet red spot present on T-III basolaterally
(fig. 214) ……………………………………………………………………moorei Bohart
4. Ocellocular distance less than 2.0 LOD (fig. 207), T-III teeth short but submedian
ones sharp …………………………………………………………..cembricola Krombein
Ocellocular distance at least 2.0 LOD (fig. 205), T-III teeth various ………………….5
5. S-II in male with black spots reaching midline or not more than 1.0 MOD from it; male
F-I more than twice as long as broad; if S-II spots in female are more than 1.0 MOD from midline, then pit row is sunken medially in side view with an overhang above declivity;
west of 100th meridian ……………………………………………………………………6
S-II in male with black spots more than 1.0 MOD from midline; male F-I about twice as long as broad or less; female S-II with spots more than 1.0 MOD from midline and pit row not presenting a median declivity with an overhang in side view …………………...7
6. S-II with black spots reaching midline (fig. 212) or rarely 0.5 MOD from it; male S-III
extensively blue to green; pit row in female separated by a somewhat depressed but broad partition, not presenting a sharp declivity in side view (fig. 215) ….............parkeri Moore
S-II in male with black spots about 0.75 to 1. 0 MOD from midline; male S-III with green spot of varying size; pit row in female with median partition weak or absent so that it presents a sharp declivity and an overhang in side view (fig. 217) ……...apontis Bohart
7. T-III breadth at apex of tooth row only about half basal breadth of segment, an abrupt
bulge laterally above pit row; teeth of T-III unusually long and sharp (fig. 211) ………………………………………………………………………………..inflata Aaron
T-III breadth at apex of tooth row considerably more than half basal breadth of segment, teeth of T-III various (fig. 208) ……………………………………………..8
8. Frons with transverse carina well developed (as in fig. 207) ………coerulans Fabricius
Frons with transverse carina vestigial with three slight remnants (fig. 205), or absent …………………………………………………………………………… schusteri Bohart
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