ENEMIES OF APHIDES. 169 



6i. — Face nearly perpendicular — i.e., nearly 



at right angles to the vertex, wing-cells 



without a hook-like nerve ...Mecoffima (Fieb.) and 



Cyrtorrhinus (Fieb.). 

 62. — Face declivous, not nearly at right angles 



to the vertex, wing-cells with a hook- 

 like nerve ... ... ... Byrsoptera {^y^vcs..). 



63. — Eyes not nearly touching the anterior 



margin of the pronotum ... 

 64. — Head constricted behind eyes ; eyes » 



large ... 

 65. — Posterior femora grooved ... ... Syst£l/onotus{¥\e\:).). 



66. — Posterior femora, not grooved .. Bicyphus {Yieh.). 



67. — Head not constricted behind eyes ; eyes 



small ... ... ... ... Macrolophus {¥\eh.). 



68. — Pronotum with anterior margin not raised 



and rounded, nor constricted into a short, 



collar-like neck, nor much constricted 



in front and widened behind in the same 



species, where the sides are sinuate and 



the base widely emarginate 

 69. — Eyes not nearly touching the anterior 



margin of the pronotum ... Malacocoris {V'lth.). 



70. — Eyes quite or nearly touching the pro- 

 notum 

 71. — Head posteriorly very thin and flat, 



covering the apex of the pronotum; 



posterior tibiae somewhat flattened 



and curved ... ... ... Pi/op/iorus (Hahn). 



72. — Posterior tibiae, not curved and flattened 

 73. — Wing-cell without a hook-like nerve ... 

 74. — Head posteriorly more or less covering 



the front of the pronotum 

 75. — Antennae nearly twice as long as the body Halticus (Hahn). 

 76. — Antennae short, not so short as the body Strongylocoris {Cost.) 

 77. — Head not covering the pronotum in front 

 78. — Species black, clothed with scattered 



golden or silvery deciduous, scale-like 



pubescence 



