1918] Thoracic Sclerites of Hemiptera 221 



Suborder Homoptera. 



family examples studied figures 



Cicadidae Cicada tibicen 1, 2, 3, 4, 5 



Cryptotympana epithesia. 



Fulgoridae Fulgora sp 9 



Ormenis sp S 



Amphiscepa bivittata. 



Cercopida; Aphrophora sp 6 



jassidse Draeculacephala sp .• 7 



Membracidae Ceresa sp. 



Psyllida; Apsylla cistellata 10 



Arytaina robusta 11 



Aphididas Pemphigus acerifolia 12 



Aleyrodidas Aleyrodes vaporariorum 13 



vSuBORDER HeTEROPTERA. 

 FAMILY. EXAMPLES STUDIED. FIGURES. 



Corixidae Corixa sp 19 



Notonectid£e Notonecta sp 15, 16 



Nepidse Ranatra sp 17 



Nepa cinerea. 

 Belostomatidas Belostoma americana 18, 20 



Zaitha sp. 



Reduviidae Sinea sp. 



Emesidse Emesa sp 14 



Nabidas Corsicus sp 24 



Cimicidae Cimex lectularius. 



Gerridae Gerris sp 21 



Capsidse Poecilocapsus sp. 



Phymatidas Phymata sp. 



Tingitidae Corythuca sp. 



Lygaeidae Lygaeus sp. 



Bery tidae Neides sp 22 



Coreidae Anasa tristis 28 



Metapodius sp. 

 Pentatomidae Brochymena sp. 



Podisus sp. 

 Thyreocoridae Thyreocoris sp 25 



GENERAL CONSIDERATIONS. 



The Hemipterous thorax, while peculiarly developed in its 

 higher forms, is in the more generalized individuals easily com- 

 parable to that of other insects. Indeed, the points of similar- 

 ity between the thorax of Cicada and that of certain Neuroptera 

 (Mantis pa or Corydalis, for example) are very marked. In each 

 of these forms the notum is similarly divided. Homologous 

 plates occur at the base of the wings of each. The pleura, 

 particularly, of these forms resemble each other, the episterna 

 and epimera being in all cases divided into upper and lower 

 portions by sutures. In certain Neuroptera, also, we find a 

 third, median sclerite in the episternum homologous with a 

 similar piece in certain Cicadidae. The coxas and sterna are als« 

 «ach alike in both Neuroptera and Cicadidae. 



