256 GUIDE TO CALIFORNIA INSECTS. 



The classification of Hemiptera consists in the separation first of the 

 thrips often as a distinct order then the lice also sometimes as a idistinct 

 order, and the division of the remainder into the Heteroptera and Homop- 

 tera, treated by English entomologists as separate orders. The aquatic Hete- 

 roptera form a natural group as does the Homopterous series including the 

 scale insects and plant lice. 



Figure 229. Section across developing- 

 wing ol' vine iiopper. 



Figure 230. Wings of Heteropterous bug. Figure 228 Male organs of vine hopper. 



SYNOPSIS OF FAMILIES. 



Coccidas: beak apparently from the breast and not jointed. Aleurodidae: 

 hind wings as large as front wings, if wingless with oval supraanal plate. 



Jassidae: hind legs enlarged, with rows of spines on tibiae. 



Aphidae: beak apparently from breast. Psyllidaeihind legs enlarged. 



Capsidae: wings with two cells beyond thickened portion and no longitudin- 

 al veins. 



Lygaeidae: front legs slender, proboscis and antennae four-jointed, and only 

 a few longitudinal veins beyond the thickened portion of the wing. Berytidas: 

 body very slender. 



Coreidae: similar to Lygaeidae but with longitudinal veins numerous. Pyrrh- 

 ocoridas: no ocelli. 



Pentatomidas scutellum large. Cydnidae, Corimelaenidae and Scutelleridae: 

 the first two with front tibiae spinose and the last two with scutellum broadlf 

 rounded behind. 



Membracidae: cheeks touching the front coxae. Cicadidae: three occelli. 

 Fulgoridae: antennae beneath the eyes. Cercopid^: pronotum not hiding the 

 scutellum. 



