Cerchysius guamensis, Fullaway, D. T., 1946

Fullaway, D. T., 1946, Hymenoptera, New Species Of Guam Chalcidoidea, Insects of Guam II, Honolulu, Hawaii: Bernice P. Bishop Museum, pp. 201-210: 208

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Cerchysius guamensis

new species

9. Cerchysius guamensis   , new species.

Female: length 2.75 mm. exclusive of ovipositor which is 1.75 mm. long; robust, metallic blue-green in color, eyes and antennae black, sheaths of ovipositor and legs brown, tarsi, however, particularly hind tarsi, infuscated; wings hyaline, slightly infumate.

Head semiglobular, convex in front, concave behind, vertical in position (viewed from above lenticular in outline, from the side approaching the semicircular, from front subcircular), transverse (width more than twice length anteriorly-posteriorly and about equal the depth), occipital margin rounded, eyes fairly large, oval, touching occipital margin above and reaching three fourths the distance to oral margin; frontovertex and face confluent, convex, frontovertex not as wide at narrowest to greatest width of eye but widening both behind and in front (if anterior margin is fixed at upper limit of antenna! scrobes it is twice as long as narrowest width), finely shagreened, ocelli placed in an equilateral triangle in posterior part, the lateral members touching ocular margin but removed several diameters from the occipital; face twice as wide below as above, with the antennae attached fairly close together at about the middle, the scrobes therefore short (less than one third length of scape) with a prominent ridge between, both frontovertex and face sparsely punctuate with fairly large but shallow punctuations, these occurring for the most part above in a double line along the ocular margin but more widely spread on the lower face which is clothed with short silvery hairs; antennae filiform, long and slender (if extended would reach beyond thorax), scape elongate, as long as depth of head, pedicel obconic, about one sixth length of scape, funicle joints six and with club all of equal or nearly equal length and each more than twice as long as the funicle, about three times as long as wide, somewhat flattened outwardly and clothed with a fine pile; mandibles stout, twice as long as wide and toothed on the broad cutting edge; genae distinctly separated from the face, fairly wide and convex, narrowing to a point above middle of eye where it meets occiput.

Prothorax transverse, short anteriorly-posteriorly and convex, declivous in front, posterior margin arcuate; mesonotum also convex, nearly as long as wide, both anterior and posterior margins arcuate, the curve being outward, finely shagreened and finely, evenly and fairly closely punctuate, the punctuations bearing short black appressed hairs; scutellum scutiform, convex and rounded apically, also finely but more sparsely punctuate and hairy; axillae triangular, apices meeting medially; metanotum transverse, declivous behind, smooth and shining, the side pieces with conspicuous spiracle, pleura also smooth and shining, convex.

Abdomen as long as thorax and as wide at first segment but beyond gradually narrowing to a point and depressed dorsally; ovipositor extended strongly and quite stout.

Wings spatulate, 2.5 times as long as wide, marginal vein quite short, not as long as the short postmarginal and stigma!, submarginal not nearly reaching middle of costal margin of wing and bearing about 20 setaceous hairs, which become more crowded outwardly; marginal ciliation inconspicuous, discal ciliation fine and close outwardly from the wedge-shaped speculum which extends diagonally inward from stigma; proximad of this the ciliation is a little sparser and uneven. Legs long and stout, the spur on the middle tibiae almost as long as the metatarsus.

Male: similar to female in most respects but with following differences: smaller in size, the frontovertex wider (width between eyes almost equaling length and just short of the width of the eye) ocelli arranged in an obtuse triangle, distance between the laterals greater than distance between laterals and anterior member; antennae more heavily clothed with whorls of long hairs, shorter, the scape about half the depth of the head.

Fadian, Sept. 18, ex Ceresium   larvae, Swezey. Described from two females and one male (holotype, allotype, and paratype) mounted on pin points;   two additional specimens, one male, one female.   All specimens issued from the same host. They had pupated within the dried skin of the larva of Ceresium unicolor   which was found in wood of an unidentified tree (native name paipay).