STIROMA BICARINATA. 73 



Brachelytroiis female. Larger and paler than the 

 male, with almost grey elytra. The frons is squarish, 

 with the keels nearly obsolete. 



The Macropterous form is rare, and I have not seen 

 it for description. 



The immature forms are common in some localities, 

 feeding on the common brake, Pteris aquiUna. I have 

 taken specimens on the Malvern Beacon in July. 



Size of body, 3*30xl'54 millimetres, or 0'13x0*06 

 inch. 



StIROMA BICARINATA, H.-Sch'if. 



Dclphax hicarinata, H.-Schiiff. 



,, nasalis, Boh. ; Flor; Marsh. 



,, vmtahilis, Boh. 

 Stiroma inutabilis, Fieb., G. D. t. 8, fig. 24. 

 Ditropis hicarinaia, Kirschb. ; Salil. 

 Stijwna nasalis, Scott; Fieb., C. E. pt. iv. 95. 



,, hicarinata, Edw. pt. i. 96. 



Two black spots, free or confluent, form a band 

 above the clypeus. Pygofer, seen from behind, penta- 

 gonal, when seen from above " transversalement 

 quadrangulaire " (Fieb.), with a deep notch. Elytra 

 of the male hyaline, with yellow nervures. 



The only insects that I have seen of this species are 

 from the cabinet of Mr. P. Mason. Originally these 

 were sent to Scott by M. Lethierry, and they now have 

 Scott's printed labels upon them, as foreign specimens. 

 I cannot from these make out sufficiently distinct 

 differences to place a specimen on a plate for comparison 

 with Stiroma afjinis, particularly as these examples are 

 so gummed on card that I could only in a general 

 manner study the pygofer of the male. Fieber's out- 

 lines of the pygofers of the Delphacidffi are clearly 

 traced, but they are too small in many instances to 

 afford good materials for comparisons. 



