and on the Species hy which they were constructed. 25 1 



the extremities of the other tarsi fuscous : wings entirely transparent, with a piceous 

 stigma, an appendiculated marginal cell and three submarginal ; the 1st very long, and 

 receiving two recurrent nervures; 2nd cell small, slightly rhomboidal (fig. 1). Female 

 rufous ; 2nd joint of antennae brown, 3rd violaceous-black ; abdomen violaceous, two 

 basal segments rough and black : wings transparent ; superior with the base, a fascia 

 across the middle including the stigma, the tip and the interior margin piceous with 

 a chalybeous shade ; inferior pitchy and chalybeous at the base and external margin and 

 transparent round the disc : hinder tibiae black, ochreous at the base, with a stripe of 

 the same colour and silky on the inside : 4 hinder tarsi fuscous, excepting the basal joint, 

 which is yellowish- white tipped with fuscous (fig. 2). The insects are drawn a trifle 

 larger than life, but the relative proportions of the sexes are presei*ved. 



I have dedicated this species to the gentleman to whom we are indebted 

 for this valuable addition to the economy of insects. I considered it at first 

 to be the Hylotoma formosa of Klug, whose essential character of the female 

 is " coccinea, ahdomine nigro-violaceo, alls hyalinis, basi fascid medid upiceque 

 nigris* ■" but in his German description he says, the two basal joints of the 

 antennae are red, the posterior legs black with red trochanters and thighs, 

 anti the basal portion of the abdomen is red beneath : now in D. Ellisii the 

 abdomen is entirely blue beneath in the female, the base and inside of the 

 hinder tibiae are ochraceous, and the basal joint of their tarsi is whitish ; the 

 2nd joint of the antennae is also brown above. The male of King's species 

 was unknown to him. 



Different as the sexes are, this is not an isolated example amongst the Ten- 

 thredinidce , for an equal dissimilarity is exhibited both in form and colour in 

 Lophyrus-f ; it is, however, very remarkable that the neuration of the wings is 

 not always precisely the same in the two sexes of Z>. Ellisii, the female not 

 unfrequently having a transverse nervure forming an additional cell next the 

 stigma, which increases the number of submarginal cells to four. The males 

 seem to be rare, for amongst upwards of twenty specimens three only were of 

 that sex. 



The economy of this insect is so totally different from that of any other 

 known species, as far as my researches extend, that if there were not the best 



* Jabrb. der Insect, vol. i. p. 248. 



t Vide L. testaceus, Klug, and L. Piai, Linn., Curt. Brit. Ent. pi. 54. 



VOL. XIX. 2 L 



