Cis quadridentatus, Zimmerman, 1942

Zimmerman, Elwood C., 1942, Ciidae of Guam, Insects of Guam-I, Honolulu, Hawaii: Bernice P. Bishop Museum, pp. 47-52 : 48

1. Cis quadridentatus , new species ( figs. 1 , c, e, i; pl. 1, A).

Dermal coloration as follows: elytra basically pale yellow with a large black humeral spot, a prominent black spot at base between scutellum and humeral spot, and with a broad, conspicuous, black, zigzag fascia extending from middle at suture to side and there greatly expanded into a low, broad triangle that extends forward to base and posteriorly almost to apex, these black markings conspicuous; prothorax either almost or entirely dark or with a variable amount of yellow, sometimes entirely black, occasionally yellow with a broad, irregular dark vitta on either side; head usually dark, but occasionally with anterior parts yellowish; appendages usually brownish yellow; under surface brownish yellow and infuscated or fuscous; dorsal setae very dense, golden yellow or black, erect, stiff, coarse, spikelike on elytra, swirled on pronotum.

Head not concealed from above by pronotum, crown almost straight in longitudinal contour in both sexes, but very slightly convex in female and slightly concave in male, densely setose, setae somewhat smaller than, but similar to, those on pronotum, and arising from small, closely placed punctures, surface appearing asperate; anterior margin slightly sinuous in the female but with four well-developed teeth in the male, the emarginations between teeth subequal. Antenna with the body of the first segment obliquely truncate at the apex, one fourth longer than broad, twice as long and twice as high as 2, 2 submoniliform, two thirds as long as 3, 3 slender, about three times as long as broad, as lortg as 4 plus 5, 4 longer than broad, as long as 5 plus half of 6, 5 to 7 successively slightly more transverse; club dark, as long as six preceding segments which are yellow, segments subequal in size and shape but 10 slightly longer and more pointed at apex, 8 and 9 about as broad as long. Prothorax slightly broader than long (1.9: 1.7), base slightly but distinctly sinuous, sides broadly arcuate, apex broadly rounded and but slightly emarginate at middle in female, but usually upturned and with a moderate or welldeveloped tooth on either side of middle in male; the lateral carina very narrowly visible from above, its basal angle rounded, thence slightly arcuate to apex and there extending beyond anterior margin, thus making anterior angle roundly acute rather than obtuse and making an emargination between lateral carina and apical margin when viewed from side; densely punctate, punctures small but coarse, distinct, narrowly separated. Elytra about five sevenths as broad as long, about twice or somewhat less than twice as long as prothorax, bullet-shaped, subparallel on sides in basal half, thence roundly narrowing to apex; densely and conspicuously punctate as pronotum; lateral carina broadly rounded into basal carina. Wings fully developed. Legs finely and sparsely setose, femora and tibiae finely alutaceous. Sternum finely setose, sculpture similar to but shallower and less distinct than that of dorsum; intercoxal process of the prosternum more than half as long as transverse diameter of a coxa (4: 7), mesocoxae hardly half so widely separated as fore coxae, metacoxae separated about as far as mesocoxae. Venter finely punctate, the setae conspicuous, moderately long, fine, hairlike; first ventrite simple in female, but with a small, median, setose, crater-like tubercle in male; intercoxal process narrowly triangular. Length, 2.5-2.75 mm.; breadth, 1.0- 1.25 mm.

Holotype male, in the U. S. National Museum , allotype female in Bishop Museum, and 20 paratypes taken from fungus at Mata, Aug. 24, 1938, R. G. Oakley .

This species resembles Cis bisetosus Blair from the Marquesas, and Cis rapaae Zimmerman from Rapa in size and shape, but the color pattern and setae are very different on this species. Cis quadridentatus closely resembles Cis insignis Scott (1926) from the Seychelles, but it differs in color pattern as well as structure. The conspicuous bicolored dorsum with its distinct design will readily separate this pretty species from the two other Guam Cis .

Figures

FIGURE 1.-Details of Ciidae. a, outline of head and pronotum of Ceracis palaccps, female; b, the same of the male; c, the same of Cis quadridentatits; d, the same of Cis guamae; e, diagram of elytral markings of Cis quadridentatits; f, outline of head and pronotum of Cis agariconae; g and h, dorsal outlines of the front margins of the heads of the male and female of Ceracis palaceps; i, the same of Cis quadridentatus; j, fore leg of male of Ceracis palaceps.