254 M. W. R. de V. GRAHAM 



SEMIO TELL US Westwood 



Semiotus Walker, 1834 : 288, 290. Type-species : 5. mundus Walker, by designation of West- 

 wood, 1839 : 70. [Generic name pre-occupied by Semiotus Eschscholtz, 1829]. 

 Semiotellus Westwood, 1839 : 70 [n. n.]. 



Stictonotus Forster, 1856 : 64, 68 [n. n. for Semiotus Walker nee Eschscholtz]. 

 Semiotellus Westwood ; Thomson, 1876a : 193, 201. 

 Semiotellus Westwood ; Schmiedeknecht, 1909 : 275, 276, 280-282. 

 Semiotellus Westwood ; Nikol'skaya, 1952 : 240. 

 Semiotellus Westwood ; Peck et al., 1964 : 33. 



Key to European Species 

 (Females) 



1 Antennal clava obliquely subtruncate at apex, the third segment with a rather 



large area of micropilosity ventrally ; the second suture of the clava in 

 profile distinctly oblique. Gaster with bristles of pygostyles not very 

 dissimilar in length. Fore wing with speculum large, extending as a bare 

 wedge below the marginal vein for more than half the length of the latter ; 

 stigma rather large, separated by about twice its height from the costal 

 margin of the wing. 



Combined length of pedicellus and flagellum slightly less than breadth of 

 head. Large species, about three mm. ; body blue-green ; piliferous 

 punctures of head, mesoscutum and scutellum very distinct ; gaster short 



sp. indet. (p. 255) 



- Antennal clava not subtruncate at apex, the third segment with only a small 



tuft of micropilosity at its apex ; sutures not oblique. Gaster with one 

 bristle of each pygostyle (Text-fig. 56) nearly twice the length of the other 

 bristles. Fore wing with speculum nearly always less extended, there 

 being, on upperside of wing, at least one row of hairs below the marginal 

 vein and extending to near the base of the latter ; stigma relatively smaller 2 



2 (1) Fore wing with marginal vein about 3-5 times as long as the stigmal vein ; 



upper surface of wing, below the marginal vein, with a band (three to five 

 rows) of hairs which extends basad nearly to the junction of the marginal 

 vein with the parastigma. Large species, about 3 mm ; body bronze- 

 black ; head, mesoscutum, and scutellum extremely finely and delicately 

 alutaceous, their piliferous punctures very small ; gaster hardly 1-5 times 

 as long as head plus thorax . . . . ? fumipennis Thomson (p. 255) 



Fore wing with marginal vein 2-4 to 3 times as long as the stigmal vein ; 

 upper surface of wing with the band of hairs below the marginal vein less 

 broad and, below the basal half of the vein, often reduced to a single row of 

 hairs. Body most often some tint of green or blue. Piliferous punctures 

 of head, mesoscutum, and scutellum usually larger and more conspicuous 

 (Text-fig. 56) ; gaster sometimes relatively longer .... 3 



3 (2) Gaster 1-75 to 2 times as long as the thorax, and 2-7 to 3-3 times as long as 



broad ; hypopygium extending hardly half way along. Legs relatively 

 more slender, especially the tibiae and tarsi ; spur of mid tibia about two 

 thirds the length of the first tarsal segment. Large, 1-9 to 2-9 mm. 



diversus (Walker) (p. 256) 



- Gaster (Text-fig. 56) 1-3 to 1-65 times as long as the thorax, and 1-5 to 2-7 



times as long as broad ; hypopygium extending half or rather more than 

 half way along. Legs relatively stout ; spur of mid tibia about four fifths 

 the length of the first tarsal segment. Species sometimes smaller . . 4 



