DIPTKRA. '3:17 



breast adorned on each side ivith a i/(dlou! spot and a short yellow hand : ab- 

 domen brouze-blark, spiiulle-sbaped, muuli longer but not broader tban tbe 

 chest ; an interrupted narroiv tawny hand on the second segment ; the third 

 segment has a broad taicny band which is interrupted by tivo irregular and 

 very slender black stripes in the middle, and by a very long forked black 

 mark on each side ; the fourth segment is like the third, but the forked marks 

 attain its fore border ; the fifth segment has Iw) pair of tawny marks, the 

 side pair very small, the middle pair very lar/je ; sixth segment parlli/ 

 taivny : legs taivny ; a broad black band near the tip of each hind-thigh ; 

 hind-shanks black, taivny at the base : wings colourless ; wing-ribs tawny ; 

 veins black, tawny towards tbe base ; brands pale brown ; poisers yellow. 

 Length of the body 2^ lines ;' of the wings 4 lines. 

 United Stales. 



SvRPHcs coALEscENS, Mas et Fern. 



Nigro-ceneus, capite pectorisque maculis Jlatis, thoracis lateribus scutel- 

 loque fulris, ahdnmine nigra fulvo vario, antetmis pedibusque fulois, 

 alis iimpidis. 



Male. Head black, bright pale yellow above, tinged with hoary and 

 clothed with white hairs behind and beneath ; face very prominent between 

 the feelers and the epistoma : eyes red ; facets on the fore part of the 

 crown much larger than those elsewhere : feelers bright pale tawny ; sixth 

 joint black, tawny at the base : chest aiul breast brassy-black ; scutcheon 

 and sides of the chest tawny ; a short yellow band and a yelloiv spot on each 

 side of the breast : abdomen black, nearly spindle-shaped, much longer and 

 a little broader than the chest ; first segment yellow at the base ; a narrow 

 tawny interrupted band on the second segment ; third and fourth segments 

 tawny, ivith the exception <f a black band along the hind border, of a black 

 stripe reaching from the hind border nearly to the fore border on each side, 

 and of two black triangles in the disk ; a tawny stripe in the middle forms 

 the base to each of these triangles which are open to the hind borders; a 

 tawny spot on each side of the fifth segment ; tip of (he sixth segment ferru- 

 ginous : legs tawny ; hind-legs darker : wings colourless ; wing-ribs tawny ; 

 veins black, tawny at the base ; poisers tawny. 



Fern. A broad black stripe on the crown, and a broad tuwny strij)e 

 between the feelers and the epistoma : legs yelloiv ; hind-legs pitehy , 

 hind-thighs yellow with a black band at the tip ; hind-shanks tawny at the 



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