256 BLENNOCAMPA ASSIMILIS. 



Abdomen and legs luteous. Antennae long, filiform, last four 

 joints abruptly shorter than the others. Transverse radial 

 nervure received a little past the middle of the third cubital 

 cellule ; third cubital cellule one fourth longer than second ; 

 at the base of lanceolate cellule is a distinct branchial nervure. 

 Wings subhyaline. Claws bifid. Apex of clypeus truncated 

 (Species 23). 



23. BLENNOCAMPA ASSIMILIS. 



Tcnthredo assimilis, Fall., Acta, 1807. 



hyalina, KL, Berl. Mag., viii, 58, 25 ; Htg., Blattw., 

 270,15. 



Selandria hyalina, Ste., 111., vii, 46, 4. 



Blennocampa assimilis, Thorns., Opus., 282, 12; Hym. Sc., i, 

 217, 18 ; Cam., Fauna, 25, 1 ; Andre, 

 Species, i, 317 ; Cat., 40,* 46. 



Black, shining, covered with a short pile ; legs and abdomen from 

 the second segment yellow ; apex of abdomen, saw and posterior tarsi, 

 black, apical joints of anterior tarsi fuscous. Antennae a little longer 

 than the head and thorax. Wings hyaline, with a faint smoky tinge ; 

 nervures black. At the base of the lanceolate cellule there is a short, 

 turned up commencement of a nervure. Palpi yellowish. 



The cT is similar, but the antennae are thicker and the apex of the 

 abdomen is not black. 



Length 2 2 lines. 



This is a widely distributed species, the imago 

 appearing in June. According to Dours (Cat. Syn., 

 18) the larva feeds on Sorlms aucuparia and Primus 

 padus, but this requires verification. 



In Scotland it has been taken in Clydesdale and in 

 Dumfries -shire ; Mr. Fletcher takes it at Worcester 

 and Mr. Dale in Dorsetshire, while it has likewise been 

 taken in the London districts. 



Continental distribution : Sweden, Germany, Hol- 

 land, France, Tyrol, Hungary. 



Obs. Mr. H. T. Stainton sent me a mined leaf of Tilia Europcea 

 which was not known to him as being caused by a Lepidopteron. It is 

 very probably that of Blennocampa tiliae, Kalt. (Pfl. 78), a species 

 closely related, if not identical with, if one might judge from the 

 description, B. assimilis. According to Kaltenbach the mine com- 

 mences at the border of the leaf, which is followed for about 1", but is 

 gradually extended until the whole half side of the leaf is occupied by 

 it. Sometimes there are two larvae on the same leaf, each occupying a 

 half. The larva is from 3 4'" long, white, clear, bare and slimy; the 

 food canal appears as a broad greenish stripe, The body is of equa. 



