226 



IVie Ohio NaturdUst. 



[Vol. II, No. 5, 



gen a 



or cheek. The fore wing or elytron, /", has a triangular 

 clavus extending along the inner or hinder part and separated 

 from the rest of the wing b}' the claval suture. It includes two 

 claval veins. From the base of the wing two principal veins run 

 toward the apex. They are called the first and second sectors, 

 or sometimes the radial and ulnar sectors. The first is usually 

 forked and the inner fork of first sector connected to the second 



sector b^• one or two trans- 



The cells at 

 are the apical 



Fig. I. Dr!/occplia!iis iiiiiniciis. a, adult, nat- 

 ural size shown by line al right ; h, face ; c, vertex 

 and pronotnin ; (/, ft-niale genitalia ; l\ male gen- 

 italia ; f, wing ; g, larva. 



(After Osliorn and P.all.) 



verse veins, 

 tip of wing 

 and those next to them the 

 ante-apical, while those 

 next the costal margin are 

 costal cells. The genitalia 

 are of great importance for 

 separating species in some 

 of the genera. The female 

 ventral segments, d, show 

 a terminal ventral 

 beyond which are 

 pieces, including 

 positor. The side pieces 

 are termed py gofers, though 

 more properly they are the 

 ventral margins of the 

 pygofer or terminal seg- 

 ment. The male, c, has 

 following the last complete 

 segment a varioush- shaped 

 partial segment, the valve, 

 following which are two 

 plates that are usually tri- 

 angular in outline and dor- 



segment 

 two side 

 the ovi- 



sal to these, usually hidden 

 by them, are the margins 

 of the pygofer. The larva 

 is shown at g\ The species 

 figured, Dcltocephalus iiiiiiiiais Say, is one of our most abundant 

 species and occurs in blue grass over a very wide range of terri- 

 tory in the United vStates. 



For systematic study of these insects, Van Duzee's "Synopti- 

 cal Arrangement of North American Jassidae " and " Catalogue 

 of the Described North American Jassoidea " are indispensil)le. 

 Scattered papers by the same author, Uhler, Fitch, Stal, Pro- 

 vancher, Wood worth and others are more or less essential. 

 Gillette and Baker's " Hemiptera of Colorado," Gillette's 

 "Typhlocybin^e," Osborn and Ball's "Review of the Genus 



