128 [June, 



At least the hind tibiae pale ; wings, except for a dark streak near the base of the 

 stigma, either clear or yellow, in the latter case the costa and the apes of 

 the stigma are also yellow ; pilosity of head and thorax (see especially the 

 mesopleurae) longish, pale, and in some lights very conspicuous 5. 



3. The sides of the 3rd cubital cell formed respectively by the radius and the 



cubitus, are nearly equal 4. 



— The 3rd cubital cell is very much longer on the radius than on the cubitus, its 



apical height also strikingly exceeds its basal height (nearly twice as high!). 

 The smallest and slenderest of our species ccBridescens, Geoffr. 



4. 3rd cubital n. almost straight (wings very dark) caeruleipennia, Retz. 



— 3rd cubital n. arcuate, its centre bulging out considerably towards the apex of the 



wing. (Wings generally less deeply infuscated than in the preceding species). 



enodis, Linn. 



5. Wings yellowish, costa and apex of stigma yellow 6. 



— Wings nearly clear, costa and stigma fuscous 7. 



6. Radial cell with a dusky streak crossing its base and that of the stigma, but 



with its apex clear and unclouded. Colour of body uniform, brightly 

 metallic, greenish. All tibise and tarsi pale ustulata. 



— Radial cell dusky both at base and apex. Body blackish, hardly metallic, with 



pale subtriangular apical marks (distinct in the $ but hardly visible in the J ) 

 on the first three or four dorsal segments at the abdomen. Legs as in 

 ustulata atrata, Forst. 



7. Hind tibiae white at base. Wings without conspicuous dusky streak at base of 



radial cell ciliaris, Linn. 



— Hind tibiae generally dusky at base. Base of radial cell with a distinct 



fuscous streak .fuscipes. Fall. 



8. Prothorax entirely orange. Saw sheath of ? laterally compressed, making it 



look narrow as viewed from above. Tibise and tarsi ringed at their apices 

 with black. Wings yellowish, with dark costa and stigma, no fuscous streak 

 at base of the radial cell roscB, De G. 



— Prothorax never entirely oi-ange, generally concolorous with the mesonotum 



(blue-black or green-black). Saw sheath of ? not compressed, forming (as 

 viewed from above) two wide bulging lobes 9. 



9. Sides of thorax and legs more or less obscurely variegated with dull reddish- 



yellow. Wings rather faintly clouded throughout with violaceous brown 

 (not yellow). Costa and stigma fuscous. No conspicuous streak at base of 

 radial c pagana, var. stephensii. Leach. 



— Sides of thorax immaculate 10. 



10. Wing fusco-violaceous ; costa, stigma, and legs entirely, dark... pagana, Panz. 



— Basal half of wings, costa, apex of stigma, and legs in part, yellow 11. 



11. Hind femora partly yellow. Wings with a very conspicuous dark streak at the 



base of radial c. Metallic reflections of thorax and legs generally intensely 

 blue cyanocrocea, Forst. 



— Hind femora entirely dark (only tibise and part of tarsi yellow). Fuscous streak 



at base of radial c. seldom very conspicuous, sometimes quite obsolete. Blue 



i-eflections of body, &c., less vivid, sometimes decidedly greenish 



melanochroa, Gmel. 



