242 EDWARD NORTON. 



der tliiglis extend over the abdomen and it approaches closely to T. 

 vaga, Fab. Head of a clear yellow, with a great black spot upon the 

 vertex, with its hinder border black. Eyes grey, antennte longer than 

 the moiety of body, setaceous, black ; first article white beneath. Corse- 

 let having before two longitudinal yellow marks, and the anterior bor- 

 der forming a collar of the same color. Scutellum yellow, dorsal gran- 

 ulation brown. Pectus of a clear yellow with a black spot upon the 

 sides. Abdomen short, wide, black and shining above; the dorsal seg- 

 ments bordered narrowly behind on the sides with clear yellow ; their 

 base, from the middle black. Wings a little longer than the abdomen, 

 transparent, at the nervures and stigma distinctly brown; marginal 

 cell divided; discoidal cells three, recurrent nervure, the two marginal 

 and the two first discoidal cells of a clear yellow. Legs of a pure yel- 

 low at their base. Anterior legs, inferior moiety of posterior thighs 

 and the posterior knees, having on their superior side a black longi- 

 tudinal mark ; posterior tarsi black." 



It is possible that the word "discoidal" is here used by mistake for 

 cubital as it is not usual to mention the discoidal cells in description. 

 If there are four submarginal cells this is probably a Macropliya. 

 allied to M. callfornicua. The T. vaga to which it is likened, is sy- 

 nonymus with T. cincta. (^Zonata) of which there are two, one of 

 which is an Emjihi/tus and one Tenthredo. 



39. T. subcoerulea. 



Tenth-redo suhcoerulca, Esch, Entomog. Berlin, 1822, 96. 63. 



" Black, with the back of abdomen blue-black, with the mandibles, 

 palpi and legs pale. 



"Isle of Unataschka, Russ. Am. Length 5 lines. 



Similar to T. mandibular is. Head black; mandibles yellow, with 

 the point brown and a black spot at their base. Palpi yellow ; cha- 

 peron of some individuals having a yellow spot on each side. Anten- 

 nve a little longer than the corselet, filiform, black. Corselet dull black; 

 dorsal granulation yellowish. Haunches with a yellow spot, abdomen 

 shining black, of a blue black above. Wings longer than body, tran- 

 sparent, at sides and the nervures of a blackish brown. Legs yellow, 

 at base black; the posterior pair with yellow spines, posterior tarsi 

 brown." 



The T. mandibxdaris to which this is said to be analogous is a true 

 Tenthredo. 



Hartig has specified another section of Tenthredo. Synaircma, which 

 difi"ers only from Tenthredo in having the lanceolate cell closed. But 

 one European species. 



