44 THE ENTOMOLOGIST. 



appear satisfactory. I cannot make fresh contributions to their 

 establishment. 



3. Jassidce. — Stfil has the merit of having, in 1866, brought 

 together again the Membracidae and the typical Jassidfe into one 

 family. This he divides into seven groups, of which the first six 

 together practically agree with the family Membracidfe founded 

 by Burmeister. The principal qualities, good and bad, of this 

 division will be discussed now. 



Amyot and Serville employed as distinguishing features be- 

 tween their Conidorsi and Planidorsi the prolongation of the 

 prothorax backwards over the abdomen, or the absence of this 

 circumstance. This character appears — especially after a genus 

 like Tolania, Sttil, is discovered — absolutely useless, for this 

 form, which is throughout akin to Centrotus, must be referred, 

 according to Amyot and Serville, to the Planidorsi. This Stal 

 has perceived, and he employs in the ' Hemiptera Africana,' for 

 the separation of five of the first groups from the " Jassida," 

 other characters as well, among which that which is based on the 

 form of the lateral margins of the head (dilated or not) is the best. 



(To be continued.) 



MISCELLANEA RHYNCHOTALIA.— No. 6. 

 By G. W. Kirkaldy, F.E.S. 



Onychotrechus, gen. nov. 



Closely allied to Gerris, suhgenns Limnogonus, Stal, and 

 intermediate between the latter and Eotrechus, Kirkaldy. It 

 differs from the former by the long posterior claws, and from the 

 latter by the claws being somewhat post-apical and inserted in 

 a cleft in the tarsi. Type, 0. rhexenor, Kirkaldy. 



General appearance of Livmogonus, but duller and more 

 pubescent. Kostrum reaching to about middle of mesosternum. 

 Antennae a little shorter than length of body ; first segment 

 shorter than any two others together. The intermediate and 

 posterior legs each more than twice as long as body. Second 

 segment of anterior tarsi three times as long as first. 



0. RHEXENOR, Sp. HOV. 



Dull blackish grey with sparse pale yellow pubescence ; a median 

 longitudinal stripe on vertex continued on to anterior lobe of pronotum, 

 a lateral line on each side of vertex (anterior to the eyes), two lateral 

 lines on each side on the anterior lobe of pronotum, lateral margins of 

 sterna — pale flavous with a pink tinge ; lateral margins of posterior 

 lobe of pronotum greyish white. Elytra pale fuscous. Antennte dark 

 fuscous, first segment paler beneath basally ; legs more or less dark 

 fuscous, paler beneath. Head beneath and prosterna (except laterally). 



