Colonomyia freemani, Published, 2007

DE SOUZA AMORIM, DALTON & RINDAL, EIRIK, 2007, Phylogeny of the Mycetophiliformia, with proposal of the subfamilies Heterotrichinae, Ohakuneinae, and Chiletrichinae for the Rangomaramidae (Diptera, Bibionomorpha), Zootaxa 1535 (1), pp. 1-92 : 16-17

Colonomyia freemani , sp. n.

( Figs. 22–27 )

Diagnosis. This species differs from other Colonomyia species by the slender syngonocoxite and the short enlarged base of the gonostyle.

Material examined. Holotype, ♂, CHILE, Dalcahue, I. Chiloé, iv.1968, L. E. Peña col. Paratypes, 8 ♂♂, 4 ♀♀, same data as holotype ; 4 ♂♂, 1 ♀ same data, but ii.1962 ; 1 male, Osorno, Pucatrihue, ii.1967, L. E. Peña col. ( MZSP) .

Description. Male. Total length, 2.30 mm. Wing length, 2.66 mm. Terminalia length, 0.22 mm; Gc length mesally, 0.06 mm; Gs length, 0.135 mm; aedeagus length, 0.13 mm. Female. Total length, 2.30 mm. Wing

length, 2.40 mm. Male. Colour. Antenna brown. Palpus light brown. Frons and occiput dark brown. Scutum and scutellum dull dark brown, lighter at anterolateral borders. Pronotum, proepisternum, and proepimeron yellow-brown. Katepisternum brown on dorsal two thirds, yellow on ventral third. Anepisternum, mesepimeron, laterotergite and mediotergite brown; metepisternum yellow. Pedicel of halter yellow, capitulum brown. Coxae and femora yellow-brown, tibiae and tarsi light brown, darker to apex. Segment 1 yellowbrown, segments 2–8 brown. Terminalia brown. Head. Scape and pedicellus with few setae, pedicellus almost round. Antenna with 14 flagellomeres with fine, scattered setae, first flagellomeres 1.3 times length of second flagellomere; 4th flagellomere 4.8 longer than width. Last segment 1.5 times longer 3rd segment. Frons brown, with scattered setae. Palpus short, not longer than head, 4 segments of about same length, with some few scattered setae, no sensorial pit. Third segment without sensorial pit. Cardo-stipes elongated, weakly sclerotized, with 2 setae. Ocelli almost in line, separated from each other by width of ocellus. Eye bridge incomplete, separated by twice width of ocellus. Thorax. Some few, fine setae on postpronotum and proepisternum, no setae on remaining pleural sclerites. Scattered weak setae on mesonotum with row of longer acrostichal setae; many small scutellar bristles, with about 4 longer setae. Irregular row of 5 or 6 stronger supra-alar setae; 2 prescutellar setae. Proepimeron long and slender. Anapleural suture absent. Mesepimeron nearly absent at ventral third, katepisternum apparently fused to laterotergite. Laterotergite slightly bulging, mediotergite high, only slightly curved at ventral third; postnotal phragma short, ventrad to mediotergite, not projecting into the abdomen. Row of 5 or 6 setae at pedicel of halter. Legs. Tibial spurs 1:2:2, spurs thin, about as long as width of tibiae at apex, mid and hind spurs of equal length. Apex of front tibia with modified area bearing regular row of setae. Strong tooth basally on tarsal claws. First tarsomere more than twice length of second tarsomere of all legs. No regular row of setae distally on mid and hind legs. Wing. Sc incomplete, quite short, sc-r not present. R 1 relatively short, reaching C not much beyond middle of wing. First sector of Rs very short, perfectly transverse, close to basal third of wing; R 5 running quite close to C, abruptly approaching margin at apex; C produced much beyond R 5, nearly reaching M 1. r-m perfectly longitudinal, very long. Medial fork weak, nearly vanishing. M 4 detached from CuA at base, CuA strongly curved to margin at distal fourth. A 1 not traceable. Abdomen. Segments 1–8 well sclerotized, with scattered setae on tergites and sclerites; segment 8 produced, tergite more sclerotized than sternite, not too short. Terminalia. Gonocoxites fused to each other mesally, forming mesal suture, projecting distally at sides; syngonocoxite short. Gonostyle digitiform, curved, wide at basal half, slender at distal half; long, fine scattered setae at basal two thirds. T9 wide and short, well sclerotized. T10 present, weakly sclerotized, with short, lobose cerci.

Female. As for male. Body length, 2.16 mm. Wing length, 2.66 mm.

Etymology. This species is named after Paul Freeman, English entomologist who made an important contribution to the description and understanding of the diversity of a number of dipteran groups, including the fauna of southern Argentina and Chile.

Comments. The general digitiform shape of the gonostyle of C. freemani is quite similar to that of C. borea and C. brasiliana , but with the enlarged base shorter. The gonocoxites, however, are fused along a short extension, which is shared in the Neotropical species of the genus perhaps only with C. magellanica Matile & Duret. It differs from C. magellanica by the shape of the gonostyle, with a short distal projection.

Figures

FIGURES 22–27. Colonomyia freemani, sp. n. 22. Head, lateral view. 23, 24. Wing. 25. Thorax. 26. Male terminalia, ventral view. 27. Female terminalia, lateral view.