Platychirus. 219 



Utterslev Mose, Vesterfælled, Ruderhegn and at Randers, the imagines 

 developing in April and May (Schlick). 



Geographical distribution : — All Europe down into Spain and Italy, 

 towards the north to northern Sweden, in Finland, Siberia and on 

 the Faroe islands and Iceland. Verrall suggests that it occurs in North 

 America as he thinks hyperboreus Willist. (nec Stæg.) a synonym. 

 P. hyperboreus Stæg. from Greenland is a good species with hoary 

 æneous or bluish abdominal spots. 



10. P. angustatus Zett. 



1843. Zett. Dipt. Scand. II, 762, 64 et 1849. VIII, 3154, 64 et 1855. 

 XII, 4661, 64 et 1859. XIII, 6005, 64 {Scaeva). — 1860. Malm, K. V. och 

 V. Samh. Goteborg Handl. VII, 42 {Scaeva). — 1901. Verr. Brit. FI. VIII, 295, 

 14, 679, figs. 254—255. — 1907. Kat. palaarkt. Dipt. III, 42. — P. quadratus 

 1843. Stæg. (nec Macq.) Naturh. Tidsskr. IV, 324. 



This species is very much like clypeatus, but it is narrower and 

 generally smaller. Male. Head and thorax as in dypeatusi abdomen 

 narrow, the basal spots larger and longer than in dypeatus, more or 

 less subquadrate and closer together; those of the of second pair long, 

 about twice as long as broad and likewise closer together than in 

 dypeatus; fifth segmenth with indistinct or no spots at the basal 

 corners. Legs coloured mainly as in dypeatus, hind tibiæ with a well 

 defined black ring and hind tarsi with the middle joints more or less 

 black; the legs are haired as in dypeatus. 



Female. This seems more distinct than the male, at all events 

 in its extreme forms. Frons and epistoma narrower than in dypeatus; 

 frons bluish, with a slight transverse depression and small and in- 

 distinct dust spots. Thorax æneous or bluish. Abdomen very narrow 

 and pointed, black, generally somewhat bluish; the basal spots are 

 small and round, the second pair quadrate or rectangular, the third 

 pair only represented by a very small spot at the basal corners, fifth 

 segment always quite black. Resides this form others occur with ab- 

 domen less pointed and the spots on fourth segment larger. Legs as 

 in dypeatus, but there seem always to be distinct and well defmed 

 broad, black rings on hind femora and tibiæ; middle joints on hind 

 tarsi yellow or more or less darkened. The legs are, I think, a little 

 less haired and shorter-haired than in dypeatus. 



Length 6,6 — 8 mm. 



Whether this species is distinct or it may be an extreme variety 

 of dypeatus it is, 1 think, at present not possible to decide, but as it 

 is understood here it is known without difficulty by the long second 

 pair of abdominal spots in the male and the narrow, pointed abdomen 



