

1. THEREVA 557 



T. arcuata (as I interpret that form) lie in the colour of the tarsi, and in 

 the shape of the frontal callus in the female ; while both forms of 

 T. arcuata have the abdomen more conical than in T. nohilitata. 



Synonymy. — I cannot consider this variety distinct from T. arcuata, because 

 Loew expressly referred to the remarkable variations in the colour of the pubescence ; 

 Loew however doubted whether his Sicilian si^ecimens belonged to the same species 

 as his northern ones and stated that if the two should prove to be distinct the name 

 I', arcuata shoidd apply to the Sicilian form ; this looks as if he possessed very few 

 German specimens and those probably belonging to the var. inornafa because his 

 description applies best to the bright colored form. The capture of a considerable 

 number of specimens is requisite before any certainty can be attained. Kowarz's 

 collection contained two males and one female, of which one of each sex was 

 labelled "Sicilia" and "sec. typ. Lw." ; the male is not at all like my first form as it 

 has the main pubescence pale brownish yellow (not tawny), the abdomen blackish 

 with the second and third hindmarginal hems conspicuously whitish when seen 

 sideways or yellowish when seen from above, the next hindmarginal hem very 

 narrow, and no more hems visible, while the yellowish grey abdominal bands are 

 indistinct or absent (but the specimen is in too bad condition for certainty), the legs 

 have the most extensive pale markings, and the fourth posterior cell of the wings is 

 closed. and distinctly pedunculate ; the female has the frontal callus almost divided 

 into two large circular spots which however just touch at the upper arch where they 

 are rather close to the front ocellus, the third antennal joint rather light brown, the 

 inibescence on the face and lower half of the back of the head white, and the wings 

 with an obvious clouded arc over the last portion of the discal cell which extends 

 downwards across the two cross-veins closing the discal cell, the base of the cubital 

 fork clouded, and the fourth posterior cell slightly pedunculate ; Kowarz's other 

 male (from Eger in Bohemia) is in very good condition, and its general pubescence 

 is almost tawny, the thorax rather pale brown with two faint yellowish brown 

 stripes, the yellowish grey bands on the abdomen (before the hindmarginal hems) 

 extensive and conspicuous, the tibiae and tarsi almost as black as in my blackest 

 form, and the femora apparently thinner and bearing less pubescence and scales but 

 possibly abraded ; in many respects this latter male is intermediate between my two 

 forms but is similar to the more tawny specimen of inornata which I have described, 

 though it has the blackened legs of the handsome form. 



3. T. nolbilitata Fabricius. Thorax brownish, with long erect black 

 and short depressed usually ferruginous pubescence. Abdomen of the 

 male with large black spots on the bases of the segments, and clothed 

 with yellowish ventral, and more or less black dorsal, pubescence ; 

 that of the female mainly golden, and usually with pale hairs on the sides 

 of the fifth and sixth segments but with short rigid black hairs on the last 

 two segments. Frontal callus of the female moderate in size. 



A rather broad species of ferruginous or brownish hue in 

 the male, but with the abdomen of the female mainly golden. 



^ . Face and f rons entirely covered with dull yellow or pale greyish dust which 

 becomes paler on the lower part of the face ; frons bearing moderately dense 

 long black hairs except for a few yellow hairs quite close to the antennae ; 

 face clothed on the middle part with dense and long yellow or pale yellow 

 pubescence in which a few black hairs occur, but on the sides with black 

 hairs four or five (or even more) wide which extend from the black pubescence 

 of the frons downwards to the lower eyemai'gin, though the band of black 

 hairs becomes narrower as it descends and is continued very sparingly along 

 under the eyes, but otherwise the yellowish ground dust becomes yellowish 

 white under the eyes and on the lower part of the back of the head and the 

 pubescence there is pale yellow with sometimes a very few black hairs inter- 

 mixed ; on the upper part of the back of the head the ground dust is brownish 

 yellow and the pubescence mainly dull darkish yellow, but about the middle 



