Charles Brongniart — Foml Insects of the Primary Rocks. 491 



wings, and with finer neuration. The nervules are also more 

 numerous than in the Megasecopterida. In this family will be classed 

 the Eemeristia occidentalis (Scudder), the Pachytylopsis Persenairei 

 (P. de Borre), the Chrestotes {C. lapidea, Scudder); C. Danae, Scud. 

 (=^Miamia Danae, Scud.) ; C.lugauensis, Sterzel; Omalia macroptera 

 (Coemans and Van Beneden) ; lastly, three new genera from Com- 

 mentry (^Oustaletia, Bracliyptilus and Diaphanoptera). 



The last three families of this group include some ancestral types 

 of the Ephemeridee, Perlidee, and of the Ascalaph^e. The Prote- 

 phemerina (genus Homaloneura (mihi) near to the living Potamantlms) . 

 The Protoperlida (genera, Protodiamphipnoa (mihi) ; ProtoTcollaria 

 (mihi) ; Pictetia (mihi) ; Protoperla (mihi).) The Protomyrme- 

 leonida (genus Protascalaphus (mihi).) 



Tho order of the Hemiptera is represented during the Palgeozoic 

 epoch. Up to the present time there have only been met with those 

 types which we have been able to class in the group of the 

 Homoptera ; these are the ancestors of our Fulgoridae and of oiir living 

 Cicadidge, Goldenberg has named Fulgorina Ebeisi and Fulgorina 

 lebachensis, insects very near to our Fulgora. In this same genus 

 I place some insects from Commentry, F. Goldendergi (mihi), F. 

 ovalis (mihi), and F. minor (mihi). 



The creation of several generic sections is necessary in order to 

 denote some remarkable specimens that I have received from Com- 

 mentry, namely: — 



Rhipidioptei-a elegans (mihi). I Protociccus parvulusdiXi^ F.fusciis {wihx). 



Bictyocicada antiqua (mihi). | Palaocixius Fayoli, 8c F. antiqincs (mihi). 



Mr. Scudder natnes a wing PhtJianocoris occidentalis that he con- 

 siders as belonging to a Hemiptera-Heteroptera. I do not share his 

 opinion, and I find a great analogy in the neuration between this 

 wing and those of Pceocera olivacea (Blanchard), which belong to 

 the Homoptera. 



This communication may be considered as giving a general view 

 of the fauna of the primary Hexapoda. New discoveries will perhaps 

 compel naturalists to multiply genera, but I believe that the general 

 sections here indicated will be able to be retained ; for all that I have 

 stated is based upon the numerous discoveries made at Commentry 

 during the last eight years. These discoveries have enabled me to 

 rectify many mistakes occasioned by want of precise data, and well- 

 preserved specimens. It is far from being perfect, but it may prove 

 of service, if it only affords a glance at the riches which have been 

 supplied to me by the mines of Commentry. 



At the moment of going to press I am in receipt of a new memoir 

 from Mr. Scudder, which establishes some new families and genera 

 among the primary Hexapods. 



Although differing in some cases, we are agreed upon many points. 

 The new genera which he creates demand a close examination, which 

 I reserve for another occasion ; but it is curious to note how few 

 types Mr. Scudder has found in America similar to those which 

 have been described in Europe. 



