62 BKITISH CICADA. 



the "notches on the sides of the hind margin of the 

 last ventral segment." 



The variability of this and other species seems to 

 preclude such minute characters from a sharp and 

 certain diagnosis ; and discrepancies here, between 

 specimen and specimen, must be almost anticipated. 

 Mr. Edwards, indeed, alludes to such variations. 



D. distinguendus is one of our commonest Delto- 

 cephcdi. The larvae of the Deltocephalidse are what 

 may be called almost grotesque in their forms, with 

 their heads and eyes exceeding the width of their 

 bodies ; their abdominal parts, which taper to an apex; 

 and their hairy legs, which are stout and somewhat 

 shorter than those seen in the images. 



Deltocephalus cokoniceps, Kirschh. Plate LI., fig. 2. 



Deltocephalus coroniceps, Kirschb. ; Edw. pt. ii. p. 57. 

 Thamnotettix coroniceps, Fieb., Cicad. d'Eur. p. 70. 



My knowledge of this insect is limited to a single 

 example in the possession of Dr. Piffard, who kindly 

 enables me thus to describe it : — 



Form somewhat linear. Colour bright yellow, 

 with ill-defined whitish marks on the pronotum. 

 (Edwards says, also, such are seen on the crown.) 

 Vertex shorter than its basal width ; with a row of 

 black dots on the apex, the middle dots of which are 

 the largest. Five or six minute dots are ranged trans- 

 versely on the pronotum. Scutellum yellow and spot- 

 less. Elytra rather shorter than the abdomen, which 

 is pale brown, with a yellowish apex, and well tufted 

 with set£e. The elytra are obscurely stained with 

 fuscous-yellow, and the courses of the nervures appear 

 whitish and shining. Legs rather long, bright yellow, 

 and all spotted with pale brown dots. The hind tibise 

 are without any inner stripe, 



