Melanostoma. 227 



on the fourth segment sometimes slightly yellowish; also on second 

 segment may be a pair of very small spots. Legs as in the male but 

 the front tarsi a little broader and the middle tarsi with the four last 

 joints somewhat broad and flattened. Squamulæ whitish. Balteres 

 whitish yellow. 



Length 9 — 9,5 mm. ' 



The pupa is quite similar to that of granditarsa and has the 

 same quite short posterior spiracular process. 



The type to this species, a male, is present in the collection of 

 Tonder Lund, where I have examined it. 



P. rosarum is like the preceding not common in Denmark; Lersø, 

 Ordrup Mose, Dyrehaven, Lyngby Mose, Geel Skov, Ruderhegn, Hille- 

 rød, Nyrup Hegn; on Lolland in Kældskov; on Funen at Veflinge; in 

 Jutland in Greisdal at Vejle, Horsens, Laven near Silkeborg, and on 

 Bornholm in Almindingen. My dates are Ve— ^^/g. It occurs on similar 

 localities as the preceding species. The larva was taken in Ruder- 

 hegn on ^^4, it developed on ^^/s (Schlick). 



Geographical distribution: — Europe down into Italy; towards 

 the north to middle Sweden, and in Finland; it occurs also in North 

 America. 



IL Melanostoma Schin. 



Also this genus is nearly allied to Platychirus and similar in size, 

 shape and colours. Head about semiglobular, or sometimes in the 

 male a little higher than broad ; it is broader than thorax. Eyes bare, 

 touching in the male, separated in the female; the facets in the male 

 a little enlarged in the upper half. Antennæ inserted lower down 

 than in Platychirus, about in the middle or a little above (in amhi- 

 guum higher above); they are small, third joint oval; arista some- 

 times pubescent. Epistoma with the central knob slightly produced, 

 the mouth cdge retreating, not prominent; the epistoma is entirely 

 black or æneous, sometimes pruinose, and with scarce, erect hairs on 

 the sides. Jowls slightly descending. Scutellum æneous. Abdomen 

 elongated, parallel-sided, in the female a little more oval; it has three 

 or four pairs of yellow spots; in some species the spots may be 

 bluish or entirely absent. The number of the abdominal segments 

 show a distinguishing character from Platychirus as in the male the 

 fifth dorsal segment is small or very small and not quite symmetricai, 

 and there are only four normal ventral segments, the fifth being hidden 

 and only represented by a thin chitinous rim, while the sixth to ninth 

 may be seen as in Platychirus ; in the female the number of segments 

 is the same as in Platychirus. Legs slender, quite simple and simply 



15* 



