2 ORTHOPTERA 



tangled. I have st-paiated Stylopyga from the genus Blatia for what I consider a vahd reason, viz. the 

 similarity of the two se.xes in the former genus, their dissimilarity in the latter. But I am far from 

 satisfied that the species now included in Blatia form a natural group and I am only restrained from 

 further depleting the genus by lack of knowledge concerning the structure of the two sexes in certain 

 species; when this knowledge comes to hand — as eventually will surely be the case — the genus can 

 be re-arranged satisfactorily. 



KEY TO THE GENERA 



I. Eves itjell-develtif>ed. Tarsal arolia present. 

 2. Posterior margin of fifth abdominal tergite vol sinuate. 

 3. Tibiae with spines on outer aspect triseriately arranged. 

 4. Posterior metatarsus shorter or not longer than the remaining 

 joints. ts'Iiicli are unarmed beneath. 

 5. Distance apart of eyes on vertex of head less than or equal 

 to the distance apart of tlie aiiteniial sockets. Old-World 

 forms. 

 5. Ocelli usually absent. Tegminal rudiments absent. Abdominal 

 tergites n'itli ztwll-marked stigmatic dots. Supra-anal lamina 

 (9) more or less bilobate. Cerci blunt and flattened , gene- 

 rally not extending beyond the supra-anal lamina ... 2. Genus Euzosteria, Shelford. 

 6'. Ocelli present. Tegmina present, rudimentary or absent. 

 Abdominal tergites rarely with stigmatic dots. Supra- 

 aiiil lamina ( 9) ^^"1 bilobate. Cerci longer, apex usually 

 adtminate. 

 7. Wings absent or rudimentary. Tegmina rudimentary or 

 absent. 

 8. Tegmina absent or repre-^ented bv squamiform lobes. 

 9. Posterior angles of the fifth and sixth abdominal tergites 

 backwardly produced . 

 10. Posterior metatarsus short, not spined beneath or with 

 only a fcKi spines ; its pulvillus usually large, and 

 occupying at least half of the joint. 

 I I . Lateral margins of pronotum not incrassated . Thoracic 

 tergites more or less smooth and nitid. 

 12. Supra-anal lamina [f^] not produced to foim an 



acute spine 3. Genus Platyzosteria, Brunner von 



12' . Supra-anal lamina {(^) produced to form an acute [Wattenwyl. 



spine 4. Genus Leptozosteria, Tepper. 



I 1 . Lateral margins of pronotum incrassated. Thoracic 



tergites punctate or tuberculate 6. Genus Zoniopi-Oca, Stal. 



10'. Posterior metatarsus longer, spined beneath, its pulvil- 

 lus not occupying one-half of the joint .... 5. Genus Cutilia, Stal. 

 g'. Posterior angles of the fifth and sixth abdomi>ial tergites 

 not backiiiardly produced, or if produced the abdominal 

 tergites are scabrous. Tegmina entirely absent. 



