Cligenes marianensis, Usinger, 1946

Usinger, Robert L., 1946, Hemiptera Heteroptera of Guam, Insects of Guam II, Honolulu, Hawaii: Bernice P. Bishop Museum, Bulletin 189, pp. 11-103 : 32-34

29. Cligenes marianensis , new species ( fig. 2 ).

Relatively small, oval, nearly glabrous with pronotal disk rather evenly punctate throughout except on humeri and with corium punctured in regular rows except for smooth area laterad of second row of punctures along claval suture and smooth costal area. Apical margin of corium strongly sinuate on inner half.

IHead three fourths as long as broad across eyes, very finely, unevenly, rugosely punctate with impunctate glabrous points in front of ocelli and broadly impunctate area at hind margin. Anteocular portion of head about as long as an eye; interocular space slightly more than twice as wide as an eye, 11: 4.5. Ocelli prominent, almost contiguous with eyes, the ratio of distance to eyes to distance between ocelli, 1:16. Antennae slightly more than one fourth longer than width of pronotum across humeri, 48: 35, proportion of segments one to four as 10: 13: 10: 15. Bucculae scarcely elevated but the rugose under surface of head with a distinct buccal trough. Rostrum reaching hind margins of middle coxae, the first segment not attaining base of head; proportion of segments one to four as 10: 14: 6: 5.

Pronotum longer than head, 19: 15; a little less than twice as broad across humeri as long, 35: 19; converging anteriorly, the lateral margins slightly sinuate at middle and rounded to anterior angles. Hind margin distinctly but shallowly concave. Disk feebly elevated posteriorly, more strongly so anteriorly, relatively sparsely and evenly covered with setigerous punctures, the punctures from one (near anterior margin) to three or four puncture widths apart. Humeri impunctate.

Scutellum as long as pronotum and scarcely broader than long, 21: 19. Disk broadly elevated and subflattened at middle of base, with a pair of converging impressions sublaterally, the disk abruptly depressed laterad of these at basal angles. Disk distinctly punctured, the punctures becoming sparser posteriorly.

Hemelytra slightly exceeding tip of abdomen and concealing the connexivum laterally. Clavus with two complete rows of punctures and a partial third row along inner margin. Corium with two rows of punctures laterad of claval suture. Beyond these rows with a broader impunctate area extending to median suture or furrow. Punctate laterad of this to impunctate costal margin, this last narrow basally but widening apically with the edge feebly reflexed. Costa! margins curved outward subbasally, slightly inwardly sinuate before the middle and then gradually rounded to convergent apices. Apical margin of corium strongly sinuate, the inner half deeply concave. Clavus and corium subhyaline. Membrane clear, hyaline, with veins very ill-defined.

Under surface highly polished except on evaporating areas surrounding right-angled, apically tapering ostiolar canal. Thoracic pleura and sterna sparsely, coarsely punctate with an impunctate area at middle of propleura and on all of metapleura except along impression and near middle. Abdominal venter shining, clothed with backward-directed, short hairs and extremely long trichobothrial hairs.

Color light brown with darker brown eyes and hind lobe of pronotum, this last with humeri, hind margin narrowly at base of scutellum and a longitudinal line at middle, paler, ochraceous. Anterior margin of pronotum, antennae at least on basal half, rostrum and.legs except for slightly infuscated bases of femora, also pale. Scutellum brown, with a broad Y-shaped marking extending from basal angles to apex, ochraceous basally and white apically. Hemelytra pale and more or less hyaline except for infuscated apical portions of clavi; a fuscous spot on either side·just before middle of costal margin extending inward to second row of punctures, and fuscous apical margin of corium, the sinu~te portion narrowly infuscated and the entire apex of corium infuscated, except for a pale spot at extreme apex. Membrane immaculate.

Size: length 2.15 mm., width (base of hemelytra) 0.9 mm.

Holotype female, Piti, May 2, Usinger ; three female paratypes, same locality, May 1, and May 11, Usinger , and July 27, Swezey. These specimens were attracted to light.

A closely related species from the Caroline Islands is much darker and has a strongly convex anterior pronotal disk. C. flavicornis Signoret is apparently closely related, but the second antenna! segment is described as the longest with the others equal, and the hemelytra are differently colored.

This is a nearly cosmopolitan genus with a remarkable variety of species throughout the islands of the southwest Pacific. I have half a dozen unclescribed species, the nearest to marianensis being one from Larat collected by Muir which is relatively broader with lateral margins of pronotum scarcely sinuate at middle and the pronotal disk ochraceous with large brown area at middle of anterior lobe and along posterior margin. C. swezeyi from Samoa differs in its impunctate pronotum as does the Philippine assimulans. Other geographically adjacent species lack the strongly sinuate apical corial margin.

Figures

FIGURE 2.-Cligenes marianensis: dorsal view showing relative number and size of punctures and sinuate inner margin of membrane.