6 A MONOGRAPH OF THE AUSTRALIAN MEMBEACIDjE, 



5 (2). Dorsum of prothorax armed with one or more 



horns or protuberances. 



6 (11). Dorsum in front, furnished with one protuber- 



ance. 



7 (10). Dorsal protuberance erect, much thickened, 



gibbous posteriorly near base. 



8 (7). Apex of dorsal protuberance much dilated on 



each side, exteriorly a sharp, slender, directly 



diverging spine Eutryonia, ]). ^4:. 



9 (8). Apex of dorsal protuberance not dilated 



laterally, destitute of lateral spines HypHoprora, p. 35. 



10(7). Dorsal protuberance porrect, slightly ascending PJnlyd,^)- 36. 



11 (6). Dorsum of prothorax with two or more pro- 



tuberances or horns. 



12 (23). Dorsum with two horns, one over each lateral 



angle. 



13 (16). Lateral horns dilated at apices; more or less 



erect, contiguous at base. 



14 (15). Apices of lateral horns reticulate, exteriorly 



with a spine; interior angle acuminate or 



gibbous, sometimes forming an arch Lnhra, p. 28. 



15 (14). Apices of lateral horns not reticulate, and des- 



titute of exterior spines but acuminate, the 



interior angle not gibbous Daunux, p. 30. 



16 (13). Lateral horns not dilated at apices, more or less 



acuminate. 



17 (18). Tibise dilated, venation in apical part of corium 



very irregular, forming many cellules ; pos- 

 terior process tectiform Se.vtius, p. 9. 



18 (17). Tibiae not dilated (one exception) ; venation 



regular (one exception, third apical cell 

 divided); posterior process not tectiform. 



19 (22). Two ulnar veins joined, near base, with a trans- 



verse venule. 

 20(21). Corium with two discoidal cells Sertoriiis, -g. IS. 



21 (20). Corium with three discoidal cells Eufrenchia, p. 24. 



22 (19). Two ulnar veins, not joined, near base, with a 



transverse venule Centrotyims, t^.'2Q. 



23 (12). Dorsum with three protuberances or horns, 



lateral horns, conical, acuminate; the third 

 placed on the median carina is a triangular 

 pine or angle, or median carina lightly and 

 briefly foliaceous AcantJiucuf!, ]). 13. 



