Stipomorpha fraudator (Shannon, 1927)

Reemer, Menno, 2013, Taxonomic exploration of Neotropical Microdontinae (Diptera: Syrphidae) mimicking stingless bees, Zootaxa 3697 (1), pp. 1-88 : 49-51

Stipomorpha fraudator (Shannon, 1927)

Figs 145–148 , 233 .

Ubristes fraudator Shannon, 1927: 20 .

Studied type specimens. HOLOTYPE. BRAZIL. Male. Label 1 (small, round, red-bordered): " Holotype "; label 2: "Amazon 66 53"; label 3: " Microdon : Ubristes fraudator Snn. ". Coll. BMNH.

Redescription (based on holotype)

Adult male. Body size: 9 mm.

Head. Face occupying about 1/4 of head width in frontal view; shining yellow with whitish pilosity, most dense sublaterally and ventrally, very sparse medially; with narrow strip of white pubescence along eye margins. Gena hardly developed, eyes almost bordering oral margin, yellow anteriorly, black posteriorly. Oral cavity with lateral margins a little produced. Frons slightly longer than width of lunula; yellow; yellow pilose laterally. Vertex a little swollen; shining black; yellow pilose. Occiput black; yellow pilose dorsally, white pilose 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 brown. Antennal ratio 5:1:4; basoflagellomere parallel-sided with rounded apex, with small sensory pit located at 3/5 from base. Arista slender, about 2/3 of length of basoflagellomere.

Thorax. Scutum yellow, with large dark brown marks on most of dorsal surface, separated by narrow yellow lines medially, submedially and along transverse suture; yellow pilose, except for two patches of black pile posterior to transverse suture. Postpronotum, postalar callus and scutellum yellow and yellow pilose. Scutellum without calcars. Pleurae yellow dorsally, brownish ventrally. Anepisternum weakly convex, without distinction between anterior and posterior part; yellow pilose anterodorsally, bare posteriorly. Anepimeron yellow pilose dorsally. Katatergum and anatergum long and short yellow microtrichose, respectively. Other pleurae bare. Calypter and halter yellow.

Wing: hyaline, without colouration, microtrichose except bare on posterobasal 1/2 of cell br, basal 1/4 of cell bm and basal 1/4 of cell cup.

Legs: Yellow and yellow pilose, except: posterior tibia blackish with narrowly yellow base, white pilose on basal 3/4, black pilose on apical 1/4; first three tarsomeres of all tarsi blackish and blackish pilose dorsally, fourth tarsomeres a little paler, fifth tarsomere yellow and yellow pilose. Hind tarsus ventrally with dense, appressed yellow pile. Coxae and trochanters yellow and yellow pilose.

Abdomen. Yellow and short yellow pilose. Second tergite wider than thorax, widest at basal 1/3; third and fourth tergites much narrower. Tergite 1 with anteromedian smooth, concave area. Sternites yellow. Genitalia as in fig. 233.

Female. Unknown.

Diagnosis. Orange-brown species with black vertex, very similar in size and colouration to S. fallax , S. mendax and S. spuria . Diagnostic characters: anepisternum with posterodorsal margin bare, alula entirely microtrichose, wing without whitish cloud or fascia, front- and mid-legs with first 3-4 tarsomeres dark brown.

Distribution. Only known from the holotype from Brazil.

Figures

FIGURES 142 – 153. 142 – 144. Stipomorpha fallax male (holotype). 142. habitus dorsal; 143. habitus lateral; 144. head frontal. 145 – 148. Stipomorpha fraudator male (holotype). 145. habitus dorsal; 146. habitus lateral; 147. head frontal; 148. head lateral. 149 – 153. Stipomorpha goettei female. 149. (lectotype), head frontal; 150. (lectotype), head lateral; 151. (Surinam, coll. RMNH), head dorsal; 152. sternites 1 – 3 lateral; 153. sternites 1 – 3 ventral.

FIGURES 233 – 239. Stipomorpha, male genitalia. 233. S. fraudator (holotype); 234. S. goettei (Surinam, coll. RMNH); 235. S. guianica (Surinam, coll. RMNH); 236. S. inarmata (holotype); 237. S. lacteipennis (lectotype); 238. S. lanei (Surinam, coll. RMNH); 239. S. litoralis (holotype).