324 IldndUrsch — JVew Paleozoic Insects from the 



cubitus being separated from tbe anal area by a comparatively 

 large space occupies a great part of tbe wing. Costa marginal. 

 Cross veins irregular, oblique and often ramified, tbe ram- 

 ifications of tbe main veins never being very rich. 



I consider as tbe type of this family a new genus, Cacuraus, 

 which is the best preserved of all. Besides this another new 

 genus, Spilomastax, is placed here, and of the previously 

 described forms, Palwomastax Handlirsch from the Westpha- 

 lian of Belgium, Archimastax Handlirsch from Fayetteville, 

 Arkansas, and Archteologus Handlirsch from Mazon Creek. 

 These latter I had described as genera of doubtful position. 

 It is not impossible that Axiologus thoracicus Handlirsch may 

 also belong in this family. 



Cacurgos, new genus. 

 Cacurgus sjrilopterus, new species. Figs. 29, 30. 



Both anterior wings are preserved, partly crossed over the 

 abdomen in a quite natural position, so that there can be no 



Fig. 29. 



Fig. 29. Cacurgus spilopterus (right fore wing), x 1'25. 



doubt that they belong to the same individual. Nevertheless 

 the venation seems to be rather different in both wings. 



The form of the wing probably has been an elliptical one, 

 two and a half times longer than broad, measuring about Y5 mm 

 in length. Costa marginal. Costal area broad, with numerous 

 oblique brandies from the subcosta, bridged over by cross 

 veins. Subcosta attaining three-quarters the length of the 

 wing and uniting with the costa. Radial sector rising some- 

 what before the middle and splitting into but 3 branches. 

 The radius itself gives off 2 strongly ramified branches, 



