Ubristes jaguarinus, Reemer, Menno, 2013

Reemer, Menno, 2013, Taxonomic exploration of Neotropical Microdontinae (Diptera: Syrphidae) mimicking stingless bees, Zootaxa 3697 (1), pp. 1-88 : 82-83

Ubristes jaguarinus spec. nov.

Figs 261–264, 266 .

Studied type specimens. HOLOTYPE. COSTA RICA. Male. Label 1: " COSTA RICA. Prov. Guanacaste, Z.P. / Nosara. Hojancha, R.F. Monte Alto, / Send. La Ceiba, 500- 600 m., 17 AUG / 2001. I. Jimenez, Libre / L_N_221650_382750#64060"; label 2: "INB0003350605 / INBIOCRI COSTA RICA "; label 3 (red): "Ultimo especimen en / B.D. A. Lépiz / 2.7.2002 " / other side: "?MCR-10". Coll. INBIO .

Description (based on holotype)

Adult male. Body size: 10 mm.

Head. Face occupying slightly less than 1/2 of head width in frontal view; yellow, with narrow, brown median line on lower 1/2; yellow pilose laterally and ventrally, black pilose medially and dorsally, except narrowly bare medially; narrowly pollinose along eye margin. Gena yellow, except for narrow brown line from eye margin to oral margin. Lateral oral margins produced. Frons yellow; mixed yellow and black pilose laterally. Vertex yellowish brown, blackish at and anteriad of ocellar triangle; black pilose. Occiput yellow; black pilose dorsally, yellow pilose laterally and ventrally. Eye very sparsely and short pilose, with pili about as long as ommati diameter, appearing bare under low magnification. Antennal fossa about as wide as high. Antenna yellowish; antennal ratio 6:1:7; basoflagellomere parallel-sided with narrowly rounded apex, with sensory pit located at 3/4 from base, within a vague groove that ranges from the base of the arista to close to the apex. Arista slender, about 2/3 of length of basoflagellomere.

Thorax. Scutum black, except margins widely yellow; appressed golden pilose along anterior margin, along transverse suture and on median vitta as wide as 1/3 of width of scutum; black pilose on other parts. Postpronotum yellow; yellow pilose. Postalar callus yellow; black pilose. Scutellum brownish; black pilose along margins, yellow pilose medially. Anepisternum dark brown anteriorly, yellow posteriorly; yellow pilose anteriorly and along posterior margin. Anepimeron yellow pilose on dorsal half. Katatergum and anatergum long and short microtrichose, respectively. Other pleurae bare. Calypter and halter yellow.

Wing: hyaline, veins in anterior half yellowish brown. Microtrichose, except bare on 1st costal cell, basal 1/3 of 2nd costal cell, basally on cell r1 along vein RS, on basal 3/4 of cell br, anterobasal 1/2 of cell bm, basal 1/6 of cell cup, almost entirely on alula (only a narrow basal strip with microtrichia).

Legs: yellow; yellow pilose, except hind leg mixed black and yellow pilose. Front and mid coxae and trochanters yellow; yellow pilose. Hind coxa and trochanter dark brown; yellow pilose, except coxa black pilose apically.

Abdomen. Tergite 1 brown medially, yellow laterally; yellow pilose. Tergite 2 halfway with lateral bulge-like tubercles; yellow with median brown vitta on anterior 3/4 and lateral brown vittae on anterior 3/4; long yellow pilose laterally on anterior half, short black pilose on posterior half, long black pilose on lateral tubercles. Tergite 3 narrowly yellow along anterior margin and on posterior 1/3, brown in between; black pilose. Tergite 4 brown on anterior 3/5 and on narrow median line extending almost to posterior margin, yellow on posterior 2/5; yellow pilose on much of brown parts, black pilose on yellow parts. Sternite 1 yellow; bare. Sternite 2 yellow; yellow pilose. Sternite 3 and 4 brown; yellow pilose. Genitalia as in fig. 266.

Female. Unknown.

Etymology. With a little imagination, the maculate colour pattern of Ubristes jaguarinus reminds of that of the jaguar, a large, feline carnivore occurring in the new world tropics.

Diagnosis. Within Ubristes s.s. this is the only known species with a maculate abdomen.

Distribution. Only known from Costa Rica.

Figures

FIGURES 261 – 266. 261 – 264. Ubristes jaguarinus male (holotype). 261. habitus dorsal; 262. habitus lateral; 263. head frontal; 264. head lateral. 265 – 266. Ubristes, male genitalia lateral. 265. S. flavitibia (holotype); 266. S. jaguarinus (holotype).