Oroschyromya fusciceps, Ebejer, 2009

Ebejer, Martin J., 2009, A revision of Afrotropical Chyromyidae (excluding Gymnochiromyia Hendel) (Diptera: Schizophora), with the recognition of two subfamilies and the description of new genera, African Invertebrates 50 (2), pp. 321-321 : 363-364

Oroschyromya fusciceps sp. n.

Fig. 21

Etymology: From Latin fuscus (dark) and caput (head), and refers to the dark colouration of the frons and antennae of this species.

Diagnosis: Dull yellow species with pale brown fr and third antennal segment; 6 scutal stripes, 0+2 dc setae, distal three tarsomeres of all legs brown and strongly setose cerc.

Description:

Male.

Head: fr narrow almost parallel sided, at level of antenna 0.8 width that at level of anterior oc and at this level 1.2× width of eye; fr, ocp and third antennal segment brown, second segment yellow with narrow brown line on dorsal ridge, lunule and first antennal segment yellow; arista with first segment brown and second segment black; eye elongate oval; gena dull yellow, 0.8 height of eye, pale setulose, 3 setae on oral margin just below vibrissal angle, mouthparts yellow except sclerite inside buccal cavity dark brown, palp small oval; postgenal seta short but distinct. Chaetotaxy: 3 usual orb (hind pair broken), vti and vte long, oc and pvt half length of vti, postocular setae in one irregular row.

Thorax: Predominantly yellow, small brown patch anteriorly at neck extending laterally to just below pprn; scutum pale brown with 6 longitudinal stripes from transverse suture to posterior margin; dc setae on pale line; scut yellow with brown lateral margin; mtn brown, pleura dull yellow. Chaetotaxy: 1 pprn, 1 posthu, 2 ntpl, no pra, 1 sa and 1 pa, 1 short post ia, 0+2 dc, the anterior short, scutal setulae in 6 irregular rows between dc lines, no prscut, 4 usual marginals on scut, 1 anepisternal and 1 katepisternal with setulae in front of each.

Wing: Hyaline with uniform pale yellowish brown tinge to membrane, veins pale brown, distance between crossveins 1.2× length of posterior crossvein, apical section of Cu 3× length of posterior crossvein and twice length of distance between crossveins; distance on costal margin between R 2+3 and R 4+5 about 0.6 that between R 4+5 and M 1+2, latter two veins slightly convergent towards wing apex. Anal cell with stump vein reduced to a thickening on the vein. Haltere pale yellow.

Legs: Yellow except for distal 3 tarsomeres brownish; setae and setulae brown, legs relatively long, femora not dilated, but thicker than in elgonae ; ventral apical spur on tibia 2 absent. Claws black, pulvilli normal, hind trochanter unmodified.

Abdomen: tg brown with longer setae along apical margin and on sides; st 5 with only a few setae grouped close together on posterolateral corner.

Postabdomen: ep brown, tg 6 a little less than half length of tg 5 and 0.6 length of ep which is higher than long, but not as much as in elongata , cerc narrow, elongate and somewhat pointed with distinct setae; prg large with setae directed anteriorly, psg narrow and about as long as surs, surs with rounded apex.

Female. Unknown.

Length: ơ body 2.2 mm, wing 2.0 mm.

Holotype: ơ RWANDA: Rusumu [02°22'S: 30°47'E], Ibanda Makera, 9–24.x.1993, fogging of Carapa grandiflora (Meliaceae) , T. Wagner (in alcohol, ZSMC).

Figures

Fig. 21. Oroschyromya fusciceps sp. n., ơ: (a) hypopygium, lateral; (b) distiph, lateral. Scale bar = 0.15 mm.