180 [January 



? . Similis mari, sed latior ; magis bruiineus ; scutellum albo- 

 maculatum ; striae liemelytrorum latiores, fascia postica magis obsoleta. 

 Subtua albus. Pedes pallidi, tibiis infuscatis. Long, c? 1| lin. 



Gercopis liistrioiiica, Fab., S. E., p. 98. Cicada histrionica, 

 Fall., Hem., 2, p. 30. Acoceph. histrionicus, Flor, R. L., 2, p. 209. 



Eare. A single ^ is in the Brit. Mus., and Mr. T. J. Bold 

 informs me that he possesses specimens from the north of England. 

 Upon this evidence, and the authority of Messrs Walker and Curtis, it 

 is here admitted as British. The ? I have never seen, and the only 

 description of it is that by Fallen, copied by Flor, and abridged above. 

 The ^ somewhat resembles rivularis, but differs in having the vertex 

 conspicuously shorter than the pronotum, and in the hemelytra, which 

 are pellucid, and owe their striated appearance merely to the blackish 

 veins. In rivularis the black and white striae are of equal breadth, and 

 the hemelytra are opaque. 



** Hemelytra irregulariter fusco lineata. 

 6. — Acoceplialiis arenicola, n. sp. 



(J ? similes. Testaceus, abdominis segmentis supra et infra 

 nigris, testaceo-marginatis. Vertex carina media distincta testacea, 

 utrinque apicem versus plus minus fusco irroratus ; nonnunquam cum 

 scutello sub-rufescens. Hemelytrorum nervi interrupte leviter infus- 

 cati ; nervus marginalis interior fuscus, albido ter quater interruptus, 

 unde (hemelytris clausis) maculae dorsales 2 vel 3 albidse apparent. 

 Frons et clypeus fusco plus minus irrorati. Pectus nigrum, lateribus 

 testaceis. Pedes testacei ; genaj posticae cum tibiis iisdem fuscae ; tarsi 

 4 anteriores apice, postici toti, fusci. Alae completae. 



Long. 1^-2 ; alar. exp. 3i lin. 



This species seems hitherto to have escaped detection. The sexes, 

 being similar in coloration, are both liable to be mistaken for the ? of 

 alhifrons, to which they have the strongest resemblance, except in the 

 following particulars. The vertex (c? ?) is much shorter than the 

 pronotum, aud the form of the insect somewhat longer and narrower 

 in proportion ; while a comparison of the males exhibits an important 

 difference in the external genital apparatus. The lamince genitales, or 

 external processes which spring from the concealed valvula, are in the 

 present species long and lanceolate, reaching upwards nearly to the 

 superior surface of the abdomen. In A. alhifrons they are sub-ovate 

 and less than half as loner. 



