PROCEEDINGS 



CALIFORNIA ACADEMY OF SCIENCES 



Fourth Series 



Vol. VI, No. 5, pp. 87-128. May 8, 1916 



MONOGRAPH OF THE NORTH AMERICAN SPECIES 

 OF ORTHOTYLUS (HEMIPTERA) 



BY 



Edward P. Van Duzee 

 Curator^ Department of Entomology 



Genus Orthatylus Fieb. 



In common with other genera of its tribe, the genus Ortho- 

 tylns has the apical margin of the pronotum without a collar ; 

 the prostemal xyphus (the triangular plate between the an- 

 terior coxae) with a more or less distinctly carinate margin, its 

 base being flat or convex, and the arolia (the pulvillae between 

 the tarsal claws) free and converging toward their apex. The 

 following are the more essential characters of this genus : 



Head almost vertical; when viewed from above, short, 

 transverse, with the eyes distinctly wider than the anterior 

 margin of the pronotum; when viewed from before, five- 

 angled, but little longer than wide across the eyes. Vertex 

 with a basal carina and before it a depressed line or area. Front 

 convex; clypeus prominent, its base usually on a line with the 

 base of the antennae. Facial angle (angle between the line of 

 the clypeus and that of the bucculae) a right angle. Eyes prom- 

 inent, viewed from the side ovate, placed a little oblique or 



May 8, 1916 



