43 



from the economic .standpoint but the various species of 

 Bufonacris become interesting- on account of their peculiar 

 obese structure and wingless bodies. These insects are 

 found in the arid and sub-arid regions southward. The forms 

 of this sub-family may be recognized by the following : 



TABLE FOR THE SEPARATION OF THE GENERA. 



A Flxtenial margin of posterior tibia' without the apical spine. 



b. Posterior tibia' terete, the lateral margins rounded, the apical spurs 

 compressed so that they are narrower than deep at base, 

 c. Body apterous. Pronotum behind straight or gently emarginate. 

 d. Head perpendicular, the frontal costa irregular, dilated at the 

 ocellus, not sulcate. Body tuberculate. 

 e. Antenna' slender, moderatelj^ long, somewhat tlatteued. Head 

 tumid. PAPIPAPPUS Sau.ssure. 



ee. Antenna' short, moderately heavy and apical ly somewhat 

 clavate. Head not tumitl. PAPPUS Saussure. 



dd. Head more or less declivant, the vertex angulate: frontal costa 

 straight, sulcate. Protonum costulate. 



PH K YNOTE TTIX Saussure. 

 cc. Body winged; the hind ]iair with a transverse duskv l)and. Pro- 

 notum angulate behind. TKIM.EROTKOP1S Stal. 

 l)b. Posterior til:)ia' more or less flattened apically, the edges acute, 

 the apical spurs depressed so thai thev arc l^roader than deep at 

 base: Winged. "C<KLOPTEKXA Stal. 

 AA. External margin of posterior lil)i:c jjrovided with an apical s])ine. 

 Body strongly depressed, apterus. Pronotum with the posterior 

 margin not produced: the mesonotum uncovered. Posterior 

 til)ia' many-.spined. BUFOXACKIS Walker. 



GENUS PAPIPAPPUS, SAUSSURE. 



F. cldrdxidiiNs Sauss. This odd looking insect was des- 

 cribed by Dr. H. de Saussure from specimens collected by G. 

 Claraz between the rivers Rio-Negro and Rio-Chubut. No 

 specimens have been examined by the writer. 



GENUS PAPPUS, SAUSSURE. 



P. iKifdi/omis Sauss. Prodrom OEdi^Dod, p. iOU. (Rio- 

 Negro, G. Claraz). 



GENUS PHRYNOTETTIX, SAUSSURE. 



A single female specimen of an insect now in my posses- 

 sion that was collected along witli live others by some mem- 

 ber of the U. S. Fish Connnission steamer Albatross staff on 

 the Straits of Magellan, is referred to this genus. It 



