1885. 



133 



that he considers that there are two species mixed up in his scries of 

 the former : the smaller and unicolorous ones coinciding with those 

 sent him as NylandrieUa, while the larger specimens with purplish 

 apex should be the real aucupari(B, Frey. The discovery of the larva 

 w^ould settle the question more satisfactorily. 



Amongst a number of Mr. Griffith's captures, which Mr. Stainton 

 received from him alive, were specimens both of aucuparia and Xy~ 

 landrieUa ; the latter being, however, the more plentiful of the two. 



Merton Cottage, Cambridge : 



September 2\st, 1885. 



LIBURNIA GUTTULA, aEKM., AND L. OUTTULIFERA, KBM. : 

 A DIFFERENTIAL ESSAY. 



BT JAMES EDWARDS. 



Amongst the series of insects intended to represent Lih. giittula 

 in my collection, I have long had a ^ which I regarded as an abnor- 

 mally small exponent of that species, but having recently taken a 

 series of both sexes of a species evidently identical with my small (^ , 

 I have been lead to investigate the matter, and upon attentive perusal 

 of so much of the literature of the subject as is at my command, I 

 find that my small species is the true guitula, as understood by 

 Kirschbaum, J. Sahlberg, and Fieber, while the larger species is the 

 JDelphax guttuliferus of the author first named. 



The principal distinctive characters of the two species may be 

 stated as follows : — 



G-UTTULA, Germ. 



Length, 2\ — 2\ mm. 



Insect very rarely macropterous. 



Elytra not widened towards the apex, 

 which is sub-lanceolate. Dark marking 

 at the apex of elytra very rarely more 

 than a small sub-triangular black spot ; 

 the brown stripe on the corium entirely 

 ■wantingr. 



Styles (viewed in situ) curved, sub- 

 parallel, scarcely perceptibly flattened, 

 vertically gradually acuminate from the 



GUTTFLIFEEA, Kbm. 



Length, Z\ — 4 mm. 



Insect generally macropterous. 



Elytra slightly widened towards the 

 rounded apex. A black or dark brown 

 streak on the membrane, continued to the 

 base of the elytra as a wide ill-defined 

 brown stripe, which is sometimes very 

 faint, but always discernible on holding 

 the elytron up to the light. (In the bra- 

 chypterous form the elytra are sub-lanceo- 

 late, but specimens in this state are easily 

 distinguished from guttula by their su- 

 perior size). 



Styles (viewed in situ) oblong parallel, 

 very distinctly flattened, vertically and 

 suddenly acuminate at about the apical 

 third. 



