BERGSTRÖM, NEW SPECIES OF PHEBELLIA FROM FINLAND 7 
about 1.4 times as long as tergite 6; sternite 7 slightly shorter than sternite 6, basal 
margin weakly sclerotized but without incision, apex without rounded free distal 
portion; 6% spiracle in intersegmental membrane between tergite 6 and sternite 6, 
7th spiracle close to lower posterior margin of tergite 6; sternite 8 absent; epiproct 
weakly sclerotized, without setae; hypoproct with posteriorly directed small setae; 
cercus long; intersegmental membrane ventrally between abdominal segment 7 and 
8 broadly and densely covered with microtrichiae, and with a strong seta in one of 
two dissected females. 
4 Differences to other species of Phebellia 
The genus Phebellia, in the restricted sense of Woop (1987), comprises — as far as 
investigated — species with a number of common characters: Palpus yellow or at least 
reddish yellow in the apical half; egg planoconvex, embryonated in the uterus; dis- 
tiphallus of the aedeagus not expanded laterally. The species-groups recognized by 
SHIMA (1982) were based on the structures of the male and female terminalia and in- 
cluded - apart from four new species from Japan — also some widely distributed 
Palaearctic species. P margaretae n.sp. is clearly assignable to the glauca-subgroup 
of SHuıma (1982). This subgroup includes two widely distributed Palaearctic species, 
P. glauca (Meigen, 1824) and P. glaucoides Herting, 1961, and one Japanese species, 
P. laxifrons Shima, 1981. They share the following structures of the male and female 
genitalia: Male: Tergite 6 entire; surstylus fused with epandrium. Female: Sternite 7 
normal, without rounded free distal portion; tergite 8 absent; intersegmental mem- 
brane between abdominal segments 7 and 8 broadly and densely covered with mi- 
crotrichiae. Compared with the other members of this subgroup, P. margaretae 
n.sp. most closely resembles the Japanese species Phebellia laxifrons Shima, 1981. 
P. margaretae n. sp. can, apart from the male and female terminalia, be recognized 
among the other members of the glauca-subgroup by the combination of a number 
of characters: Scutellum black or sometimes narrowly reddish brown at apex; palpus 
usually brown with a reddish yellow tip; section of vein M between dm-cu and the 
bend 0.7-0.9 times as long as the distance from the bend to the wing margin; tibia 
black or brownish black. d: Frons 0.65-0.73 times as wide as an eye, with strong 
outer vertical setae; length of frons longer than length of face; fore claws and pulvil- 
li as long as fifth tarsomere; tergites 3 and 4 with scattered discal setae, sometimes an 
irregular row of discal setae on tergite 4. 
Males of P margaretae n.sp. can be added to the Japanese species of Phebellia 
Robineau-Desvoidy by modifying couplet 7 of the key by SHıma (1982: 72): 
7 6: Fore claws and pullvilli shorter than or at most as long as 5‘ tarsomere; outer vertical 
SELASTLONS Wy Sons) eer ER Be ned BORA EEE nie saves OY ir Reh RUN lee ad ia, 7b 
— 6: Fore claws and pullvilli distinctly longer than 5th tarsomere; outer vertical seta at most 
very weakly developed ee fe tree ate er a, Od BE 8 
7b Frons 0.65-0.73 times as wide as an eye; length of frons longer than length of face; tibia 
black or brownish black; fore claws and pulvilli as long as 5!" tarsomere; tergites 3 and 4 
with scattered discal setae. — Genitalia (Figs. 3-6): Cerci and surstylus distinctly stouter 
than in Jaxifrons; cerci in dorsal view broad to about middle and then evenly narrowed to 
apex, distance from base of suture to apex about 2 times the width of cerci at middle, 
somewhat broadly separated from each other in apical 2/3, in lateral view broad in its whole 
length and towards apex gradually a little more curved ventrally. Surstylus in lateral view 
