76 STUDIES IN NORTH AMERICAN MEMBR ACID/E 



Agondas. Of the three or four described species one is occas- 

 ionally taken along the southern borders. 



1. Antianthe expansa Germar. 



This insect has much the aspect of Archasia but the ante- 

 rior line of the crest leans somewhat over the face and the 

 posterior slope of the dorsum is rectilinear or nearly so from 

 almost over the humeri. It can however be best recognized by 

 the long slender humeral angles which are nearly as long as the 

 space from their base to the median carina. In color they are 

 green fading to yellowish testaceous with the dorsal carina 

 dotted with black. They have been reported from the southern 

 states and California. 



Genus Cyrtolobus Goding 



This genus, to which Dr. Fitch gave the preoccupied name 

 Cyrtosia, is one of the largest as it is perhaps the most difficult 

 to study of all our North American Membracids. Twenty six 

 species are known to me, three others I have placed provision- 

 ally and four I have been unable to locate to my satisfaction. 

 As in other large plastic genera many of the species are very 

 closely related and might perhaps with equal propriety be re- 

 garded as varieties. The species known to me fall into four 

 natural groups or subgenera. In the first or typical group 

 [Cyrtolobus Godg. ) the pronotum is compressed with a reg- 

 ularly rounded outline, beginning nearly or quite at the base 

 of the metopidium and in the less typical species becoming 

 attenuated and distinctly arcuated posteriorly, or it may be less 

 compressed, some times scarcely more than carinated above 

 with the crest placed well back and showing a distinct sinus at 

 its anterior base. In the second (Atymna Stal) the pronotum 

 is compressed, elevated anteriorly; with its highest point above 

 or before the humeri. In the third group {Evashnieadca Godg.) 

 the form is more elongated, the crest is low and is deeply sin- 

 uated on the middle, and the apex of the pronotum is produced 

 in a slender acute process. In the fourth {Xantholobus VanD.) 

 the crest is placed still farther back, is strongly inflated and 



